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Barajas B, Kurtz IS, Waldman AJ, Schiffman JD. Stiffness and Oligomer Content Affect the Initial Adhesion of Staphylococcus aureus to Polydimethylsiloxane Gels. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 37922414 DOI: 10.1021/acsami.3c11349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2023]
Abstract
The growing prevalence of methicillin-resistant Staphylococcus aureus (S. aureus) infections necessitates a greater understanding of their initial adhesion to medically relevant surfaces. In this study, the influence of the mechanical properties and oligomer content of polydimethylsiloxane (PDMS) gels on the initial attachment of Gram-positive S. aureus was explored. Small-amplitude oscillatory shear rheological measurements were conducted to verify that by altering the base to curing (B:C) ratio of the commonly used Sylgard 184 silicone elastomer kit (B:C ratios of 60:1, 40:1, 10:1, and 5:1), PDMS gels could be synthesized with Young's moduli across four distinct regimes: ultrasoft (15 kPa), soft (30 kPa), standard (400 kPa), and stiff (1500 kPa). These as-prepared gels (unextracted) were compared to gels prepared from the same B/C ratios that underwent Soxhlet extraction to remove any unreacted oligomers. While the Young's moduli of unextracted and extracted PDMS gels prepared from the same B:C ratio were statistically equivalent, the associated adhesion failure energy statistically decreased for the ultrasoft gels after extraction (from 25 to 8 J/mm2). The interactions of these eight well-characterized gels with bacteria were tested by using S. aureus SH1000, a commonly studied laboratory strain, as well as S. aureus ATCC 12600, which was isolated from a human lung infection. Increased S. aureus inactivation occurred only when the bacteria were incubated directly on top of the unextracted gels prepared at high B:C ratios (40:1 and 60:1), whereas none of the extracted gels (no unreacted oligomers) had significant levels of inactivated bacteria. S. aureus adhered the least to the stiffest extracted PDMS gels (no unreacted oligomers) and the most to soft, unextracted PDMS gels (with ∼17% unreacted oligomers). These findings suggest that both unreacted oligomers and Young's moduli are important material factors to consider when exploring the attachment behavior of Gram-positive S. aureus to hydrophobic elastomer gels.
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Affiliation(s)
- Brandon Barajas
- Department of Chemical Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003-9303, United States
| | - Irene S Kurtz
- Department of Chemical Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003-9303, United States
| | - Abraham J Waldman
- Department of Chemical Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003-9303, United States
| | - Jessica D Schiffman
- Department of Chemical Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003-9303, United States
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Beebe JM, Ahn D, Eldred DV, Fielitz AJ, Heyl TR, Lee M, Mangold S, Pearce EZ, Reinhardt CW, Roggenbuck C, Scherzer JM, Shull KR, Silvaroli AJ, Tan YJ, Wang M. Photocured Simultaneous and Sequential PDMS/PMMA Interpenetrating Polymer Networks. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jeremy M. Beebe
- The Dow Chemical Company, Midland, Michigan 48686, United States
| | - Dongchan Ahn
- The Dow Chemical Company, Midland, Michigan 48686, United States
| | - Donald V. Eldred
- The Dow Chemical Company, Midland, Michigan 48686, United States
| | | | - Tyler R. Heyl
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Myoungbae Lee
- The Dow Chemical Company, Midland, Michigan 48686, United States
| | - Shane Mangold
- The Dow Chemical Company, Midland, Michigan 48686, United States
| | - Eric Z. Pearce
- The Dow Chemical Company, Midland, Michigan 48686, United States
| | | | | | | | - Kenneth R. Shull
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Anthony J. Silvaroli
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Yu-Jing Tan
- The Dow Chemical Company, Midland, Michigan 48686, United States
| | - Muzhou Wang
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208, United States
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Arcos-Casarrubias JA, Vázquez-Torres H, Granados-Olvera JA, Cedeño AJ, Cervantes-Uc JM. Viscoelastic behavior and toughness of the DGEBA epoxy resin with 1,2-diaminocyclohexane: effect of functionalized poly(dimethylsiloxane), diglycidyl ether, PDMS-DGE, pre-reacted with 1,2-diaminocyclohexane. Polym Bull (Berl) 2022. [DOI: 10.1007/s00289-021-03607-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Enhanced mechanical and adhesive properties of PDMS based on novel PDMS-epoxy IPN structure. JOURNAL OF POLYMER RESEARCH 2021. [DOI: 10.1007/s10965-021-02518-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Wang C, Zhang Y, Li J, Yang Z, Wang Q, Wang T, Li S, Chen S, Zhang X. Shape memory properties of interpenetrating polymer networks (IPNs) based on hyperbranched polyurethane (HBPU). Eur Polym J 2020. [DOI: 10.1016/j.eurpolymj.2019.109393] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Verma S, Das S, Mohanty S, Nayak SK. Development of multifunctional polydimethylsiloxane (PDMS)‐epoxy‐zinc oxide nanocomposite coatings for marine applications. POLYM ADVAN TECHNOL 2019. [DOI: 10.1002/pat.4656] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Shatakshi Verma
- Department of Plastics TechnologyCentral Institute of Plastics Engineering and Technology (CIPET) Chennai India
| | - Sonalee Das
- Research and DevelopmentLaboratory for Advanced Research in Polymeric Materials (LARPM) Bhubaneswar India
| | - Smita Mohanty
- Department of Plastics TechnologyCentral Institute of Plastics Engineering and Technology (CIPET) Chennai India
- Research and DevelopmentLaboratory for Advanced Research in Polymeric Materials (LARPM) Bhubaneswar India
| | - Sanjay Kumar Nayak
- Department of Plastics TechnologyCentral Institute of Plastics Engineering and Technology (CIPET) Chennai India
- Research and DevelopmentLaboratory for Advanced Research in Polymeric Materials (LARPM) Bhubaneswar India
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Su WC, Tsai FC, Huang CF, Dai L, Kuo SW. Flexible Epoxy Resins Formed by Blending with the Diblock Copolymer PEO- b-PCL and Using a Hydrogen-Bonding Benzoxazine as the Curing Agent. Polymers (Basel) 2019; 11:E201. [PMID: 30960184 PMCID: PMC6418520 DOI: 10.3390/polym11020201] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2019] [Revised: 01/20/2019] [Accepted: 01/21/2019] [Indexed: 11/16/2022] Open
Abstract
In this study, we enhanced the toughness of epoxy resin by blending it with the diblock copolymer poly(ethylene oxide⁻b⁻ε-caprolactone) (PEO-b-PCL) with a benzoxazine monomer (PA-OH) as the thermal curing agent. After thermal curing, Fourier transform infrared spectroscopy revealed that intermolecular hydrogen bonding existed between the OH units of the epoxy⁻benzoxazine copolymer and the C⁻O⁻C (C=O) units of the PEO (PCL) segment. Differential scanning calorimetry and dynamic mechanical analysis revealed that the glass transition temperature and storage modulus of the epoxy⁻benzoxazine matrix decreased significantly upon increasing the concentration of PEO-b-PCL. The Kwei equation predicted a positive value of q, consistent with intermolecular hydrogen bonding in this epoxy⁻benzoxazine/PEO-b-PCL blend system. Scanning electron microscopy revealed a wormlike structure with a high aspect ratio for PEO-b-PCL as the dispersed phase in the epoxy⁻benzoxazine matrix; this structure was responsible for the improved toughness.
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Affiliation(s)
- Wei-Chen Su
- Department of Materials and Optoelectronic Science, Center of Crystal Research, National Sun Yat-Sen University, Kaohsiung 804, Taiwan.
| | - Fang-Chang Tsai
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science and Engineering, Hubei University, Wuhan 430062, China.
| | - Chih-Feng Huang
- Department of Chemical Engineering, National Chung Hsing University, 145 Xingda Road, Taichung 402-27, Taiwan.
| | - Lizong Dai
- Department of Material Science and Engineering, Fujian Provincial Key Laboratory of Fire Retardant Materials, College of Materials, Xiamen University, Xiamen, Fujian 361005, China.
| | - Shiao-Wei Kuo
- Department of Materials and Optoelectronic Science, Center of Crystal Research, National Sun Yat-Sen University, Kaohsiung 804, Taiwan.
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 807, Taiwan.
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Manjula Dhevi D, Jaisankar S, Pathak M. Effect of new hyperbranched polyester of varying generations on toughening of epoxy resin through interpenetrating polymer networks using urethane linkages. Eur Polym J 2013. [DOI: 10.1016/j.eurpolymj.2013.06.041] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Nemoto T, Amir I, Konishi GI. Synthesis and Properties of a High-Molecular-Weight Organosoluble Bisphenol A Novolac. Polym J 2009. [DOI: 10.1295/polymj.pj2008199] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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