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Wang Y, Tu X, Shi L, Yang H. Quality characteristics of silver carp surimi gels as affected by okara. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2023. [DOI: 10.1080/10942912.2022.2153863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Yudong Wang
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Xiaoqin Tu
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Liu Shi
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Hong Yang
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
- Key Laboratory of Environment Correlative Dietology, Huazhong Agricultural University, Ministry of Education, Wuhan 430070, China
- National R&D Branch Center for Conventional Freshwater Fish Processing (Wuhan), Wuhan 430070, China
- Aquatic Product Engineering and Technology Research Center of Hubei Province, Wuhan 430070, China
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2
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The effects of silica aerogel on the rheological behaviour and polymer matrix structure of Rigid Polyurethane foams. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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3
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Preparation and Properties of Polyurethane Composite Foams with Silica-Based Fillers. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12157418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Polyurethane composite foams were prepared by adding three different types of silica materials as a filler to improve the mechanical and thermal insulation properties. The first type of filler consists of silica aerogels with high-volume pores, with the expectation of improving the thermal insulation of PU foams because silica aerogel itself has superior thermal insulation properties. Silica nanoparticle is used for the second type that has a size very similar to the pore size of silica aerogels for comparison. The last type to produce polyurethane composite foam uses a sol–gel reaction to produce polysiloxane that reacts with polyols during the urethane reaction and forming process. In particular, in the case of silica aerogels and nanoparticles, their surfaces are modified with APTES and then polymeric methylene diphenylene diisocyanate (PMDI) to increase the interaction between the polymer matrix and inorganic fillers. The polyurethane foam structure was successfully produced in all cases of composite foams. As expected, the mechanical properties and the thermal insulation effect were enhanced by the addition of silica fillers, but found to be closely related to the cell structure of polyurethane foams. The addition of small amounts of inorganic fillers improves the mechanical and thermal properties, but the higher the amount of filler, the worse they are due to the agglomeration of fillers on the cell walls. The dispersion of added inorganic fillers within the foam cells should be controlled effectively. Surface-modified silica fillers exhibit better enhancement of mechanical and thermal insulation properties.
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Saganuwan SA. Biomedical Applications of Polyurethane Hydrogels, Polyurethane Aerogels and Polyurethane-Graphene Nanocomposite Materials. Cent Nerv Syst Agents Med Chem 2022; 22:79-87. [PMID: 35507789 DOI: 10.2174/1871524922666220429115124] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 01/06/2022] [Accepted: 02/05/2022] [Indexed: 11/22/2022]
Abstract
BACKGROUND Increasing new emerging ill-healths have posed therapeutic challenges in modern medicine. Hence polyurethane hydrogels that comprise polyol, copolymer and extender could be prepared from diverse chemical compounds with adjuvants such as ascorbic acid, sorbitol among others. Their mechano-physicochemical properties are functions of their biological activities. Therefore there is need to assess their therapeutic potentials. METHODS literature were searched on synthesis and medical uses of polyurethane - hydrogels, polyurethane - aerogels and polyurethane - graphene nanocomposite materials, with a view to identifying their sources, synthesis, mechanical and physiochemical properties, biomedical applications, chirality, and the relevance of Lipinski's rule of five in the synthesis of oral polyurethane nanocomposite materials. RESULTS The prepared hydrogels and aerogels could be used as polymer carriers for intradermal, cutaneous and intranasal drugs. They can be fabricated and used as prosthetics. In addition the strength modulus (tensile stress-tensile strain ratio), biodegradability, biocompatibility and non-toxic effects of the polyurethane hydrogels and aerogels are the highly desirable properties. However, body and environmental temperatures may contribute to their instability, hence there is need to improve on the synthesis of aerogels and hydrogels of polyurethane that can last for many years. Alcoholism, diabetes, pyrogenic diseases, mechanical and physical forces, and physiological variability may also reduce the life span of polyurethane aerogels and hydrogels. CONCLUSION Synthesis of polyurethane hydrogel-aerogel complex that can be used in complex, rare biomedical cases is of paramount importance. These hydrogels and aerogels may be hydrophobic, hydrophilic, aerophobic-aerophilic or amphiphilic and sometimes lipophilic depending on structural components and the intended biomedical uses. Polyurethane graphene nanocomposite materials are used in the treatment of a myriad of diseases including cancer and bacterial infection.
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Affiliation(s)
- Saganuwan Alhaji Saganuwan
- Department Of Veterinary Pharmacology And Toxicology, College Of Veterinary Medicine, Federal University Of Agriculture P.M.B 2373, Makurdi, Benue State, Nigeria
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A comparison between the effects of hydrophobic and hydrophilic silica aerogel fillers on tensile and thermal properties of unsaturated polyester composites. Polym Bull (Berl) 2021. [DOI: 10.1007/s00289-021-03798-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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6
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Oladele IO, Akinwekomi AD, Ibrahim IO, Adegun MH, Talabi SI. Assessment of Impact Energy, Wear Behavior, Thermal Resistance and Water Absorption Properties of Hybrid Bagasse Fiber/CaCO 3 Reinforced Polypropylene Composites. INT POLYM PROC 2021. [DOI: 10.1515/ipp-2020-3984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
To harness the inherent advantages of both synthetic and natural reinforcements, mercerized bagasse fibers (BF) and particulate calcium carbonate (CaCO3) were utilized as a complementing reinforcement for the fabrication of bagasse fiber/calcium carbonate (BF/CaCO3) polypropylene composites. Two sets of composites were produced – one with mercerized BF/CaCO3 and the other with unmercerized BF/ CaCO3. The effect of reinforcement loading on the impact energy, wear behavior, thermal resistance and water absorption properties of the composites were studied. Results showed that the mercerized BF/CaCO3 hybrid reinforced polypropylene composites exhibited significant increase in impact energy and offered better resistance to weight loss during wear test. Similarly, the thermal resistance of the mercerized composites was higher than their corresponding unmercerized composites. Additionally, water absorption in mercerized composites was highly resisted than in unmercerized samples. These results indicated that mercerization treatment and reinforcement hybridization improved the impact energy, wear, thermal resistance and water ingress resistance of hybrid fiber/ particulate reinforced polypropylene composites.
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Affiliation(s)
- I. O. Oladele
- Department of Metallurgical and Materials Engineering, The Federal University of Technology , Akure , Ondo State , Nigeria
| | - A. D. Akinwekomi
- Department of Metallurgical and Materials Engineering, The Federal University of Technology , Akure , Ondo State , Nigeria
| | - I. O. Ibrahim
- Department of Metallurgical and Materials Engineering, The Federal University of Technology , Akure , Ondo State , Nigeria
| | - M. H. Adegun
- Department of Metallurgical and Materials Engineering, The Federal University of Technology , Akure , Ondo State , Nigeria
- Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology , Hong Kong China
| | - S. I. Talabi
- Department of Materials and Metallurgical Engineering, University of Ilorin , Ilorin , Kwara State , Nigeria
- Materials Engineering Department, Federal University of São Carlos , São Carlos , SP , Brazil
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7
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Guzel Kaya G, Deveci H. Synergistic effects of silica aerogels/xerogels on properties of polymer composites: A review. J IND ENG CHEM 2020. [DOI: 10.1016/j.jiec.2020.05.019] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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8
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Advances in precursor system for silica-based aerogel production toward improved mechanical properties, customized morphology, and multifunctionality: A review. Adv Colloid Interface Sci 2020; 276:102101. [PMID: 31978639 DOI: 10.1016/j.cis.2020.102101] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 12/08/2019] [Accepted: 01/06/2020] [Indexed: 11/23/2022]
Abstract
Conventional silica-based aerogels are among the most promising materials considering their special properties, such as extremely low thermal conductivity (~15 mW/mK) and low-density (∼0.003-0.5 g.cm-3) as well as high surface area (500-1200 m2. g-1). However, they have relatively low mechanical properties and entail extensive and energy-consuming processing steps. Silica-based aerogels are mostly fragile and possess minimal mechanical properties as well as a long processing procedure which hinders their application range. The key point in improving the mechanical properties of such a material is to increase the connectivity in the aerogel backbone. Several methods of mechanical improvement of silica-based aerogels have been explored by researchers such as (i) use of flexible silica precursors in silica gel backbone, (ii) surface-crosslinking of silica particles with a polymer, (iii) prolonged aging step in different solutions, (iv) distribution of flexible nanofillers into the silica solution prior to gelation, and, most recently, (v) polymerizing the silica precursor prior to gelation. The polymerized silica precursor, as in the most recent approach, can be gelled either by binodal decomposition (nucleation and growth), resulting in a particulate structure, or by spinodal decomposition, resulting in a non-particulate structure. By optimizing the material composition and processing conditions of materials, the aerogel can be tailored with different functional capabilities. This review paper presents a literature survey of precursor modification toward increased connectivity in the backbone, and the synthesis of inorganic and hybrid systems containing siloxane in the backbone of the silica-based aerogels and its composite version with carbon nanofillers. This review also explains the novel properties and applications of these material systems in a wide area. The relationship among the materials-processing-structure-properties in these kinds of aerogels is the most important factor in the development of aerogel products with given morphologies (particulate, fiber-like, or non-particulate) and their resultant properties. This approach to advancing precursor systems leads to the next-generation, multifunctional silica-based aerogel materials.
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Hai Y, Wang C, Jiang S, Liu X. Layer-by-Layer Assembly of Aerogel and Alginate toward Self-Extinguishing Flexible Polyurethane Foam. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b05590] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yun Hai
- School of Mechanical and Automotive Engineering, South China University of Technology, Wushan Road 381, Guangzhou 510641, P. R. China
- Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, South China University of Technology, Guangzhou 510641, P. R. China
| | - Chuhui Wang
- School of Mechanical and Automotive Engineering, South China University of Technology, Wushan Road 381, Guangzhou 510641, P. R. China
- Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, South China University of Technology, Guangzhou 510641, P. R. China
| | - Saihua Jiang
- School of Mechanical and Automotive Engineering, South China University of Technology, Wushan Road 381, Guangzhou 510641, P. R. China
- Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, Pennsylvania 19104, United States
- Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, South China University of Technology, Guangzhou 510641, P. R. China
| | - Xinyi Liu
- School of Mechanical and Automotive Engineering, South China University of Technology, Wushan Road 381, Guangzhou 510641, P. R. China
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Zhu L, Wang Y, Cui S, Yang F, Nie Z, Li Q, Wei Q. Preparation of Silica Aerogels by Ambient Pressure Drying without Causing Equipment Corrosion. Molecules 2018; 23:molecules23081935. [PMID: 30072663 PMCID: PMC6222790 DOI: 10.3390/molecules23081935] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2018] [Revised: 07/30/2018] [Accepted: 07/31/2018] [Indexed: 11/16/2022] Open
Abstract
The silica aerogels were prepared via a sol-gel technique and ambient pressure drying by using industrial solid wastes, dislodged sludges, as raw materials. A strategy was put forward to reduce the corrosion of equipment during the drying procedure. The pore structure, hydrophobicity, and thermal insulation property of the obtained samples were investigated in detail. The results show that the corrosion can be effectively avoided by using an equimolar mixture of trimethylchlorosilane (TMCS) and hexamethyldisilazane (HMDS) as silylation agents. At a Si:TMCS:HMDS molar ratio of 1:0.375:0.375, the silica aerogels possess a desirable pore structure with a pore volume of 3.3 ± 0.1 cm³/g and a most probable pore size of 18.5 nm, a high hydrophobicity with a water contact angle of 144.2 ± 1.1°, and a low thermal conductivity of 0.031 ± 0.001 W/(m∙K).
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Affiliation(s)
- Lixiao Zhu
- College of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, China.
| | - Yali Wang
- College of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, China.
| | - Suping Cui
- College of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, China.
| | - Feihua Yang
- State Key Laboratory of Solid Waste Reuse for Building Materials, Beijing 100024, China.
| | - Zuoren Nie
- College of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, China.
| | - Qunyan Li
- College of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, China.
| | - Qi Wei
- College of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, China.
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Lei C, Li J, Sun C, Yang H, Xia T, Hu Z, Zhang Y. A Co-Precursor Approach Coupled with a Supercritical Modification Method for Constructing Highly Transparent and Superhydrophobic Polymethylsilsesquioxane Aerogels. Molecules 2018; 23:molecules23040797. [PMID: 29601481 PMCID: PMC6017923 DOI: 10.3390/molecules23040797] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Revised: 03/18/2018] [Accepted: 03/21/2018] [Indexed: 01/05/2023] Open
Abstract
Polymethylsilsesquioxane (PMSQ) aerogels obtained from methyltrimethoxysilane (MTMS) are well-known high-performance porous materials. Highly transparent and hydrophobic PMSQ aerogel would play an important role in transparent vacuum insulation panels. Herein, the co-precursor approach and supercritical modification method were developed to prepare the PMSQ aerogels with high transparency and superhydrophobicity. Firstly, benefiting from the introduction of tetramethoxysilane (TMOS) in the precursor, the pore structure became more uniform and the particle size was decreased. As the TMOS content increased, the light transmittance increased gradually from 54.0% to 81.2%, whereas the contact angle of water droplet decreased from 141° to 99.9°, ascribed to the increase of hydroxyl groups on the skeleton surface. Hence, the supercritical modification method utilizing hexamethyldisilazane was also introduced to enhance the hydrophobic methyl groups on the aerogel’s surface. As a result, the obtained aerogels revealed superhydrophobicity with a contact angle of 155°. Meanwhile, the developed surface modification method did not lead to any significant changes in the pore structure resulting in the superhydrophobic aerogel with a high transparency of 77.2%. The proposed co-precursor approach and supercritical modification method provide a new horizon in the fabrication of highly transparent and superhydrophobic PMSQ aerogels.
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Affiliation(s)
- Chaoshuai Lei
- School of Materials Science and Engineering, Beihang University, Xueyuan Road 37, Beijing 100191, China.
- National Key Laboratory of Advanced Functional Composite Materials, Aerospace Research Institute of Materials and Processing Technology, Beijing 100076, China.
| | - Junning Li
- National Key Laboratory of Advanced Functional Composite Materials, Aerospace Research Institute of Materials and Processing Technology, Beijing 100076, China.
| | - Chencheng Sun
- National Key Laboratory of Advanced Functional Composite Materials, Aerospace Research Institute of Materials and Processing Technology, Beijing 100076, China.
| | - Hailong Yang
- National Key Laboratory of Advanced Functional Composite Materials, Aerospace Research Institute of Materials and Processing Technology, Beijing 100076, China.
| | - Tao Xia
- School of Materials Science and Engineering, Beihang University, Xueyuan Road 37, Beijing 100191, China.
- National Key Laboratory of Advanced Functional Composite Materials, Aerospace Research Institute of Materials and Processing Technology, Beijing 100076, China.
| | - Zijun Hu
- School of Materials Science and Engineering, Beihang University, Xueyuan Road 37, Beijing 100191, China.
- National Key Laboratory of Advanced Functional Composite Materials, Aerospace Research Institute of Materials and Processing Technology, Beijing 100076, China.
| | - Yue Zhang
- School of Materials Science and Engineering, Beihang University, Xueyuan Road 37, Beijing 100191, China.
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Zhang T, Zhao Y, Wang K. Polyimide Aerogels Cross-Linked with Aminated Ag Nanowires: Mechanically Strong and Tough. Polymers (Basel) 2017; 9:E530. [PMID: 30965831 PMCID: PMC6418569 DOI: 10.3390/polym9100530] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Revised: 10/11/2017] [Accepted: 10/16/2017] [Indexed: 11/16/2022] Open
Abstract
In this study, polyimide (PI)/Ag nanowire (AgNW) nanocomposite aerogels with extremely high mechanical performance have been fabricated utilizing amine-modified AgNWs as mechanical nanoreinforcement particulates and crosslinking agents. Initially, AgNWs were fabricated and surface modified by p-aminothiophenol (PATP), then the aminated AgNWs were dispersed into polyamide acid solution and aerogels were prepared by supercritical CO₂ drying. Raman and X-ray photoelectron spectroscopy (XPS) spectrometry were carried out on A-AgNWs (aminated Ag nanowires) to prove the successful modification. This functional nanoparticle greatly enhanced the strength and toughness of aerogels without evident increase in densities. Comparing to pure PI aerogels, samples with 2.0 wt % of A-AgNWs had a 148% increase in compression strength and 223% increase in Young's modulus, which equates to 2.41 and 27.66 MPa, respectively. Simultaneously, the tensile test indicated that aerogels with 2.0 wt % of A-AgNWs had a breaking energy of 40.18 J/m³, which is 112% higher than pure PI aerogels. The results presented herein demonstrate that aminated AgNWs are an innovative cross-linker for PI aerogels and can improve their strength and toughness. These aerogels have excellent potential as high-duty, lightweight porous materials in many areas of application.
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Affiliation(s)
- Tianyi Zhang
- School of Material Science & Engineering, Beihang University, Beijing 100191, China.
| | - Yan Zhao
- School of Material Science & Engineering, Beihang University, Beijing 100191, China.
| | - Kai Wang
- Key Laboratory of Aerospace Materials and Performance, School of Material Science & Engineering, Beihang University, Beijing 100191, China.
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Maghsoudi K, Motahari S. Mechanical, thermal, and hydrophobic properties of silica aerogel-epoxy composites. J Appl Polym Sci 2017. [DOI: 10.1002/app.45706] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Khosrow Maghsoudi
- School of Chemical Engineering, Faculty of Engineering; University of Tehran; P.O. Box 11365/4563 Tehran Iran
| | - Siamak Motahari
- School of Chemical Engineering, Faculty of Engineering; University of Tehran; P.O. Box 11365/4563 Tehran Iran
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14
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Karami S, Motahari S, Pishvaei M, Eskandari N. Improvement of thermal properties of pigmented acrylic resin using silica aerogel. J Appl Polym Sci 2017. [DOI: 10.1002/app.45640] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Sara Karami
- School of Chemical Engineering, Faculty of Engineering; University of Tehran; P.O. Box 11365/4563, Tehran Iran
| | - Siamak Motahari
- School of Chemical Engineering, Faculty of Engineering; University of Tehran; P.O. Box 11365/4563, Tehran Iran
| | - Malihe Pishvaei
- Department of Resins and additives; Institute for Color Science and Technology; P.O. Box 16765/654, Tehran Iran
| | - Navid Eskandari
- School of Chemical Engineering, Faculty of Engineering; University of Tehran; P.O. Box 11365/4563, Tehran Iran
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Kiran S, Joseph R. X-ray shielding polyurethanes: Synthesis and characterization. INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION 2017. [DOI: 10.1080/1023666x.2016.1263906] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- S. Kiran
- Division of Polymeric Medical Devices, Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Trivandrum, Kerala, India
| | - Roy Joseph
- Division of Polymeric Medical Devices, Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Trivandrum, Kerala, India
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Schwan M, Rößler M, Milow B, Ratke L. From Fragile to Resilient Insulation: Synthesis and Characterization of Aramid-Honeycomb Reinforced Silica Aerogel Composite Materials. Gels 2015; 2:E1. [PMID: 30674133 PMCID: PMC6318652 DOI: 10.3390/gels2010001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Revised: 11/25/2015] [Accepted: 12/09/2015] [Indexed: 12/04/2022] Open
Abstract
The production of a new composite material embedding aramid honeycomb materials into nano-porous silica aerogels is studied. Our aim is to improve the poor mechanical strength of silica aerogels by aramid honeycombs without losing the amazing properties of the aerogels like little density and low thermal conductivity. The composite materials were prepared using two formulations of silica aerogels in combination with aramid honeycomb materials of different cell sizes. The silica aerogels are prepared using silicon alkoxides methyltrimethoxysilane and tetraethylorthosilicate as precursors in a two-step acid⁻base sol⁻gel process. Shortly in advance of the gelation point, the aramid honeycombs were fluted by the sol, gelation occurred and, after the aging process, the gel bodies were supercritically dried. The properties of the received composite materials are satisfying. Even the thermal conductivities and the densities are a bit higher than for pure aerogels. Most importantly, the mechanical strength is improved by a factor of 2.3 compared to aramid honeycomb materials and by a factor of 10 compared to the two silica aerogels themselves. The composite materials have a good prospective to be used as an impressive insulation material.
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Affiliation(s)
- Marina Schwan
- Institute of Materials Research, German Aerospace Center, Linder Hoehe, 51170 Cologne, Germany.
| | - Matthias Rößler
- Institute of Materials Research, German Aerospace Center, Linder Hoehe, 51170 Cologne, Germany.
| | - Barbara Milow
- Institute of Materials Research, German Aerospace Center, Linder Hoehe, 51170 Cologne, Germany.
| | - Lorenz Ratke
- Institute of Materials Research, German Aerospace Center, Linder Hoehe, 51170 Cologne, Germany.
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18
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Verdolotti L, Lavorgna M, Lamanna R, Di Maio E, Iannace S. Polyurethane-silica hybrid foam by sol–gel approach: Chemical and functional properties. POLYMER 2015. [DOI: 10.1016/j.polymer.2014.10.017] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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