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Sun F, Dedong H, Fei L, Weiqiang W, Zhaotao G, Zhuo Z. Molecular-level investigation of plasticization of polyethylene terephthalate (PET) in supercritical carbon dioxide via molecular dynamics simulation. R Soc Open Sci 2022; 9:220606. [PMID: 36016914 DOI: 10.5061/dryad.crjdfn35s] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 05/15/2022] [Accepted: 07/14/2022] [Indexed: 05/25/2023]
Abstract
The current study aims to use the molecular dynamics (MD) simulation method to discuss the glass transition behaviour and fractional free volume (FFV) of the pure polyethylene terephthalate (PET) and the plasticized PET induced by supercritical carbon dioxide (SC-CO2) sorption. The adsorption concentration reproduced through sorption relaxation cycles (SRC) was firstly estimated and in an order of magnitude with the known experimental results available in the reported literature. The FFV induced by SC-CO2 in PET polymer changes regularly, which is proportional to the capacity of SC-CO2 adsorption with the changes in temperature and pressure. The glass transition temperature (T g) was further estimated to be almost identical to the known experimental values and shows a gradually decreasing tendency with the increase of pressure. Meanwhile, the plasticization of PET polymer studied by radial distribution functions showed that CO2 molecules occupying the sorption sites on the PET backbone promoted plasticization by increasing the fluidity of the PET backbone chain.
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Affiliation(s)
- Fayu Sun
- Key Laboratory of High-efficiency and Clean Mechanical Manufacture (Ministry of Education), National Experimental Teaching Demonstration Center for Mechanical Engineering, School of Mechanical Engineering, Shandong University, Jinan 250061, People's Republic of China
- Shanda-Lunan Research Institute of Supercritical Fluid Technology, Shandong University, Jinan 250061, People's Republic of China
| | - Hu Dedong
- Shanda-Lunan Research Institute of Supercritical Fluid Technology, Shandong University, Jinan 250061, People's Republic of China
- School of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, People's Republic of China
| | - Li Fei
- Key Laboratory of High-efficiency and Clean Mechanical Manufacture (Ministry of Education), National Experimental Teaching Demonstration Center for Mechanical Engineering, School of Mechanical Engineering, Shandong University, Jinan 250061, People's Republic of China
- Shanda-Lunan Research Institute of Supercritical Fluid Technology, Shandong University, Jinan 250061, People's Republic of China
| | - Wang Weiqiang
- Key Laboratory of High-efficiency and Clean Mechanical Manufacture (Ministry of Education), National Experimental Teaching Demonstration Center for Mechanical Engineering, School of Mechanical Engineering, Shandong University, Jinan 250061, People's Republic of China
- Shanda-Lunan Research Institute of Supercritical Fluid Technology, Shandong University, Jinan 250061, People's Republic of China
- School of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, People's Republic of China
| | - Gao Zhaotao
- Key Laboratory of High-efficiency and Clean Mechanical Manufacture (Ministry of Education), National Experimental Teaching Demonstration Center for Mechanical Engineering, School of Mechanical Engineering, Shandong University, Jinan 250061, People's Republic of China
- Shanda-Lunan Research Institute of Supercritical Fluid Technology, Shandong University, Jinan 250061, People's Republic of China
| | - Zhang Zhuo
- School of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, People's Republic of China
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Sun F, Dedong H, Fei L, Weiqiang W, Zhaotao G, Zhuo Z. Molecular-level investigation of plasticization of polyethylene terephthalate (PET) in supercritical carbon dioxide via molecular dynamics simulation. R Soc Open Sci 2022; 9:220606. [PMID: 36016914 PMCID: PMC9399702 DOI: 10.1098/rsos.220606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2022] [Accepted: 07/14/2022] [Indexed: 05/10/2023]
Abstract
The current study aims to use the molecular dynamics (MD) simulation method to discuss the glass transition behaviour and fractional free volume (FFV) of the pure polyethylene terephthalate (PET) and the plasticized PET induced by supercritical carbon dioxide (SC-CO2) sorption. The adsorption concentration reproduced through sorption relaxation cycles (SRC) was firstly estimated and in an order of magnitude with the known experimental results available in the reported literature. The FFV induced by SC-CO2 in PET polymer changes regularly, which is proportional to the capacity of SC-CO2 adsorption with the changes in temperature and pressure. The glass transition temperature (T g) was further estimated to be almost identical to the known experimental values and shows a gradually decreasing tendency with the increase of pressure. Meanwhile, the plasticization of PET polymer studied by radial distribution functions showed that CO2 molecules occupying the sorption sites on the PET backbone promoted plasticization by increasing the fluidity of the PET backbone chain.
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Affiliation(s)
- Fayu Sun
- Key Laboratory of High-efficiency and Clean Mechanical Manufacture (Ministry of Education), National Experimental Teaching Demonstration Center for Mechanical Engineering, School of Mechanical Engineering, Shandong University, Jinan 250061, People's Republic of China
- Shanda-Lunan Research Institute of Supercritical Fluid Technology, Shandong University, Jinan 250061, People's Republic of China
| | - Hu Dedong
- Shanda-Lunan Research Institute of Supercritical Fluid Technology, Shandong University, Jinan 250061, People's Republic of China
- School of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, People's Republic of China
| | - Li Fei
- Key Laboratory of High-efficiency and Clean Mechanical Manufacture (Ministry of Education), National Experimental Teaching Demonstration Center for Mechanical Engineering, School of Mechanical Engineering, Shandong University, Jinan 250061, People's Republic of China
- Shanda-Lunan Research Institute of Supercritical Fluid Technology, Shandong University, Jinan 250061, People's Republic of China
| | - Wang Weiqiang
- Key Laboratory of High-efficiency and Clean Mechanical Manufacture (Ministry of Education), National Experimental Teaching Demonstration Center for Mechanical Engineering, School of Mechanical Engineering, Shandong University, Jinan 250061, People's Republic of China
- Shanda-Lunan Research Institute of Supercritical Fluid Technology, Shandong University, Jinan 250061, People's Republic of China
- School of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, People's Republic of China
| | - Gao Zhaotao
- Key Laboratory of High-efficiency and Clean Mechanical Manufacture (Ministry of Education), National Experimental Teaching Demonstration Center for Mechanical Engineering, School of Mechanical Engineering, Shandong University, Jinan 250061, People's Republic of China
- Shanda-Lunan Research Institute of Supercritical Fluid Technology, Shandong University, Jinan 250061, People's Republic of China
| | - Zhang Zhuo
- School of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, People's Republic of China
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Fang L, Meikuang L, Ye G, Xiaojuan C, Wenyu Y, Min R, Lixian C, Weiqiang W, Zhibo H, Zhongchao H, Xiaofan Z. Successful Treatment of a 19-Month-Old Boy with Hepatitis Associated Aplastic Anemia by Infusion of Umbilical Cord-Derived Mesenchymal Stromal Cells: A Case Report. Cell Transplant 2021; 30:963689720977144. [PMID: 33525921 PMCID: PMC7863554 DOI: 10.1177/0963689720977144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Here we presented a case of a 19-month-old boy who developed severe aplastic anemia postacute hepatitis. He was treated successfully with the umbilical cord-derived mesenchymal stromal cells (UC-MSCs) infusion and cyclosporine A (CsA). The boy achieved both hematopoietic recovery and normal lymphocyte proportion. So far, his condition still remains stable. To our knowledge, there is a rare previous report on the utility of MSCs infusion for the treatment of hepatitis-associated aplastic anemia (HAAA). Considering the efficacy, safety, and strong operability, particularly for pediatric patient, the infusion of UC-MSCs combined with CsA could be an effective alternative for the treatment of HAAA.
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Affiliation(s)
- Liu Fang
- Institute of Hematology and Blood Diseases Hospital, 12501Peking Union Medical College and Chinese Academy of Medical Sciences, Tianjin, China
| | - Lim Meikuang
- National Engineering Research Center of Cell Products, Tianjin AmCellGene Engineering Co., Ltd, Tianjin, China
| | - Guo Ye
- Institute of Hematology and Blood Diseases Hospital, 12501Peking Union Medical College and Chinese Academy of Medical Sciences, Tianjin, China
| | - Chen Xiaojuan
- Institute of Hematology and Blood Diseases Hospital, 12501Peking Union Medical College and Chinese Academy of Medical Sciences, Tianjin, China
| | - Yang Wenyu
- Institute of Hematology and Blood Diseases Hospital, 12501Peking Union Medical College and Chinese Academy of Medical Sciences, Tianjin, China
| | - Ruan Min
- Institute of Hematology and Blood Diseases Hospital, 12501Peking Union Medical College and Chinese Academy of Medical Sciences, Tianjin, China
| | - Chang Lixian
- Institute of Hematology and Blood Diseases Hospital, 12501Peking Union Medical College and Chinese Academy of Medical Sciences, Tianjin, China
| | - Wang Weiqiang
- National Engineering Research Center of Cell Products, Tianjin AmCellGene Engineering Co., Ltd, Tianjin, China
| | - Han Zhibo
- Institute of Hematology and Blood Diseases Hospital, 12501Peking Union Medical College and Chinese Academy of Medical Sciences, Tianjin, China.,National Engineering Research Center of Cell Products, Tianjin AmCellGene Engineering Co., Ltd, Tianjin, China
| | - Han Zhongchao
- Institute of Hematology and Blood Diseases Hospital, 12501Peking Union Medical College and Chinese Academy of Medical Sciences, Tianjin, China.,National Engineering Research Center of Cell Products, Tianjin AmCellGene Engineering Co., Ltd, Tianjin, China
| | - Zhu Xiaofan
- Institute of Hematology and Blood Diseases Hospital, 12501Peking Union Medical College and Chinese Academy of Medical Sciences, Tianjin, China
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