1
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Qiu G, Ma W. Low dielectric and thermal properties of polyimides based on PMDA, BPADA, TPE-Q and TPE-R. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2023. [DOI: 10.1080/10601325.2022.2138763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/09/2023]
Affiliation(s)
- Guorong Qiu
- School of Materials Science and Engineering, South China University of Technology, Guangzhou, P.R. China
| | - Wenshi Ma
- School of Materials Science and Engineering, South China University of Technology, Guangzhou, P.R. China
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2
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Luo Y, Ni L, Shen L, Qiu C, Liu P, Liang M, Zou H, Zhou S. Fabrication of Rigid Polyimide Foams by Constructing Dual Crosslinking Network Structures. Ind Eng Chem Res 2023. [DOI: 10.1021/acs.iecr.2c03496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Yinfu Luo
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu610065, China
| | - Long Ni
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu610065, China
| | - Lu Shen
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu610065, China
| | - Chen Qiu
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu610065, China
| | - Pengbo Liu
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu610065, China
| | - Mei Liang
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu610065, China
| | - Huawei Zou
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu610065, China
| | - Shengtai Zhou
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu610065, China
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3
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Salahshoori I, Mohseni A, Namayandeh Jorabchi M, Ghasemi S, Afshar M, Wohlrab S. Study of modified PVDF membranes with high-capacity adsorption features using Quantum mechanics, Monte Carlo, and Molecular Dynamics Simulations. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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4
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Wan C, Jia D, Zhan S, Zhang W, Yang T, Li Y, Li J, Duan H. Property investigation for high-Performance Polyimides fabricated via compression molding in solid-like state. HIGH PERFORM POLYM 2022. [DOI: 10.1177/09540083221148392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A compacted body was fabricated by pulverulent polyimide (PI) block copolymers using solid-like state compression molding (SCM) technique. Polymer heated to solid-like state, i.e. the high-elastic non-melting state above the glass transition temperature ( Tg) and well below melting temperature, could achieve plasticity due to dramatic decreases in elastic modulus. Tensile properties were taken as response values, and the results of single-factor experiments indicated that molding temperature was the dominant parameter on mechanical performances, followed by molding pressure and holding time. Within this context, the SCM process possesses a longer processing time window whereas the processing temperature is narrow. The manufacturing defects induced by inappropriate processing conditions also hurt the tribological performance of PIs. Particles in a solid-like state could coalesce tightly only by exerting both high temperature and pressure in the SCM process. Thermoforming mechanism examined by atomic-scale molecular dynamics simulation indicated that non-bonding interaction forces, especially van der Waals forces play a key role in fusing among polymeric particles. This study is devoted to establishing the interdependence of structure-formability-property for high-temperature polymers that are not melt processible.
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Affiliation(s)
- Changxin Wan
- State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection, Wuhan, China
- Hubei Longzhong Laboratory, Xiangyang, China
| | - Dan Jia
- State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection, Wuhan, China
- Hubei Longzhong Laboratory, Xiangyang, China
| | - Shengpeng Zhan
- State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection, Wuhan, China
- Hubei Longzhong Laboratory, Xiangyang, China
| | - Wulin Zhang
- State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection, Wuhan, China
- Hubei Longzhong Laboratory, Xiangyang, China
| | - Tian Yang
- State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection, Wuhan, China
- Hubei Longzhong Laboratory, Xiangyang, China
| | - Yinhua Li
- State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection, Wuhan, China
- Hubei Longzhong Laboratory, Xiangyang, China
| | - Jian Li
- State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection, Wuhan, China
- Hubei Longzhong Laboratory, Xiangyang, China
| | - Haitao Duan
- State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection, Wuhan, China
- Hubei Longzhong Laboratory, Xiangyang, China
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5
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Jiang T, Peng J, Wang J, Yang J, Zeng G. Structure–Property Relationship of Co-PI Film Made by Incorporating 1,2,4,5-Benzenetetracarboxylic Anhydride into 3,3',4,4'-Biphenyltetracarboxylic Dianhydride/P-Phenylenediamine. POLYMER SCIENCE SERIES A 2022. [DOI: 10.1134/s0965545x22700493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
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6
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High temperature phenylethynyl-terminated imide oligomers derived from asymmetric diphenyl ether diamines for resin transfer molding. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.125635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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7
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Ji B, Wang T, Li M, Shi L, You X, Sun F, Luan H. Localized Surface Hydrophilicity Tailoring of Polyimide Film for Flexible Electronics Manufacturing Using an Atmospheric Pressure Ar/H 2O Microplasma Jet. MICROMACHINES 2022; 13:1853. [PMID: 36363874 PMCID: PMC9696727 DOI: 10.3390/mi13111853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Revised: 10/26/2022] [Accepted: 10/26/2022] [Indexed: 06/16/2023]
Abstract
The poor hydrophilicity of polyimide (PI) films limits their applications in flexible electronics, such as in wearable and implantable bio-MEMS devices. In this paper, an atmospheric pressure Ar/H2O microplasma jet (μAPPJ) with a nozzle diameter of 100 μm was utilized to site-selectively tune the surface hydrophilicity of a PI film. The electrical and optical characteristics of the μAPPJ were firstly investigated, and the results showed that multi-spikes occurred during the plasma discharge and that diverse reactive species, such as O atoms and OH radicals, were generated in the plasma plume. The physical and chemical properties of pristine and microplasma-modified PI surfaces were characterized by the water contact angle (WCA), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). The wettability of the PI surface was significantly enhanced after microplasma modification, and the WCA could be adjusted by varying the applied voltage, water vapor content, plasma treatment time and storage time. The AFM images indicated that the surface roughness increased after the plasma treatment, which partially contributed to an improvement in the surface hydrophilicity. The XPS results showed a reduction in the C content and an increase in the O content, and abundant hydrophilic polar oxygen-containing functional groups were also grafted onto the PI film surface. Finally, the interaction mechanism between the PI molecular chains and the microplasma is discussed. The breaking of C-N and C-O bonds and the grafting of OH radicals were the key pathways to dominate the reaction process.
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Affiliation(s)
- Bowen Ji
- Unmanned System Research Institute, Northwestern Polytechnical University, Xi’an 710072, China
- Collaborative Innovation Center, Northwestern Polytechnical University, Shanghai 201108, China
| | - Tao Wang
- School of Mechanical Engineering, Anhui University of Technology, Ma’anshan 243032, China
| | - Meng Li
- School of Mechanical Engineering, Anhui University of Technology, Ma’anshan 243032, China
| | - Liping Shi
- School of Mechanical Engineering, Anhui University of Technology, Ma’anshan 243032, China
| | - Xiaoli You
- Unmanned System Research Institute, Northwestern Polytechnical University, Xi’an 710072, China
- Collaborative Innovation Center, Northwestern Polytechnical University, Shanghai 201108, China
| | - Fanqi Sun
- Unmanned System Research Institute, Northwestern Polytechnical University, Xi’an 710072, China
- Collaborative Innovation Center, Northwestern Polytechnical University, Shanghai 201108, China
| | - Haiwen Luan
- Querrey Simpson Institute for Bioelectronics, Northwestern University, Evanston, IL 60201, USA
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8
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Salahshoori I, Namayandeh Jorabchi M, Valizadeh K, Yazdanbakhsh A, Bateni A, Wohlrab S. A deep insight of solubility behavior, mechanical quantum, thermodynamic, and mechanical properties of Pebax-1657 polymer blends with various types of vinyl polymers: A mechanical quantum and molecular dynamics simulation study. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119793] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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9
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Luo Y, Ni L, Shen L, Sun T, Liang M, Liu P, Zou H, Zhou S. Fabrication of rigid polyimide foams by adopting active crosslinking strategy. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.125220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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10
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Structure and Properties of Low Dielectric Constant Polyetherimide Films Containing-CF3 and Cardo Groups. Macromol Res 2022. [DOI: 10.1007/s13233-022-0089-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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11
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Fluorine Substitution Effect on the Material Properties in Transparent Aromatic Polyimides. CHINESE JOURNAL OF POLYMER SCIENCE 2022. [DOI: 10.1007/s10118-022-2702-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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12
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Nica SL, Hulubei C, Popovici D, Dobromir M. Metallized polyimide films for biomedical applications: X‐ray photoelectron spectroscopy, surface tension, and blood compatibility studies. POLYM ENG SCI 2022. [DOI: 10.1002/pen.25872] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
| | - Camelia Hulubei
- “Petru Poni” Institute of Macromolecular Chemistry Iasi Romania
| | | | - Marius Dobromir
- Interdisciplinary Research Institute, Sciences Department Alexandru Ioan Cuza University of Iasi Iasi Romania
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13
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Wei P, Lou H, Yan J, Li L, Zhang Y, Xia Y, Wang Y, Wang Y. Synthesis and properties of high performance aromatic thermotropic liquid crystal copolyesters based on naphthalene ring structure. POLYMER 2022. [DOI: 10.1016/j.polymer.2021.124472] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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14
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Lin D, Jiang M, Li R, Qi S, Wu D. Clarifying the Effect of Drafting Conditions on Structure and Properties of Polyimide Fibers at Molecular Dynamic Level. MACROMOL THEOR SIMUL 2022. [DOI: 10.1002/mats.202100081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Daolei Lin
- State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China
| | - Ming Jiang
- State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China
| | - Runyue Li
- State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China
| | - Shengli Qi
- State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China
- Changzhou Institute of Advanced Materials Beijing University of Chemical Technology Changzhou Jiangsu 213164 China
| | - Dezhen Wu
- State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China
- Changzhou Institute of Advanced Materials Beijing University of Chemical Technology Changzhou Jiangsu 213164 China
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15
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Luo Y, Ni L, Zhang X, Jiang X, Zou H, Zhou S, Liang M, Liu P. Fabrication of Rigid Polyimide Foams with Superior Compressive Properties. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.1c04059] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Yinfu Luo
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Long Ni
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Xueqin Zhang
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Xinyue Jiang
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Huawei Zou
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Shengtai Zhou
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Mei Liang
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Pengbo Liu
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
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16
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17
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Olariu MA, Hamciuc C, Asandulesa M, Hamciuc E, Epure E, Tsakiris V, Lisa G. Study on highly thermostable low‐k polymer films based on
fluorene‐containing
polyetherimides. POLYM ENG SCI 2021. [DOI: 10.1002/pen.25792] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Marius Andrei Olariu
- Electrical Engineering Faculty, Department of Electrical Measurements and Materials “Gh. Asachi” Technical University Iasi Romania
- R&D Department Prosupport Consulting SRL Iasi Romania
| | | | | | - Elena Hamciuc
- “Petru Poni” Institute of Macromolecular Chemistry Iasi Romania
| | - Elena‐Luiza Epure
- Faculty of Chemical Engineering and Environmental Protection “Cristofor Simionescu”, Department of Natural and Synthetic Polymers “Gh. Asachi” Technical University of Iasi Iasi Romania
| | - Violeta Tsakiris
- Department of Composite and Polymer Metallic Materials INCDIE ICPE‐CA Bucharest Romania
| | - Gabriela Lisa
- Faculty of Chemical Engineering and Environmental Protection “Cristofor Simionescu”, Department of Chemical Engineering “Gh. Asachi” Technical University of Iasi Iasi Romania
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18
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Revealing the High-Modulus Mechanism of Polyimide Films Prepared with 3,4'-ODA. Polymers (Basel) 2021; 13:polym13183175. [PMID: 34578077 PMCID: PMC8473375 DOI: 10.3390/polym13183175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 09/12/2021] [Accepted: 09/16/2021] [Indexed: 12/02/2022] Open
Abstract
To prepare PIs (polyimides) with desirable thermal and mechanical properties is highly demanded due to their widespread applications in flexible optoelectronic devices and printed circuit boards. Here, the PI films of BPDA/4,4′-ODA, BPDA/3,4′-ODA, PMDA/4,4′-ODA, PMDA/3,4′-ODA systems were prepared, and it was found that the PIs with 3,4′-ODA always exhibit a high modulus compared with the PIs with 4,4′-ODA. To disclose the mechanism of high-modulus PI films with 3,4′-ODA, amorphous PI models and uniaxial drawing PI models were established and calculated based on MD simulation. The PI structural deformations at different length scales, i.e., molecular chain cluster scale and repeat unit scale, under the same stress were detailed and analyzed, including the variation of chain conformation, bond length, bond angle, internal rotation energy, and torsion angle. The results indicate that PIs with 3,4-ODA have higher internal rotation energy and smaller deformation with the same stress, consistent with the high modulus.
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19
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Li B, Tian L, Pan L, Li J. Molecular dynamics investigation of structural and mechanical properties of silica nanorod reinforced dental resin composites. J Mech Behav Biomed Mater 2021; 124:104830. [PMID: 34530300 DOI: 10.1016/j.jmbbm.2021.104830] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 09/02/2021] [Accepted: 09/07/2021] [Indexed: 10/20/2022]
Abstract
In this work, molecular dynamics simulations are conducted to investigate the structural and mechanical properties of dental materials, i.e., the silica nanorod reinforced Bis-GMA/TEGDMA resin composite. The effects of loading content and size of the silica nanorods on the composite stiffness were performed by examining resin chain conformation, hydrogen bonds and matrix/filler binding energy. It is revealed that the presence of the silica nanorod causes polymer chain expansion, endowing the resins with higher stiffness. Moreover, the volumetric hydrogen bonds and binding energy increase considerably with the loading content, but decrease gradually with the diameter or show almost independence of the length. Furthermore, the composite moduli were quantified by the micromechanics models and the transverse moduli were well predicted by the Counto model, signifying a perfect bonding between the matrix and nanorod. The chain expansion and energetic matrix/filler interactions are believed to contribute to the significant mechanical reinforcement of the composites with the loading content. However, the length of the nanorod has a little effect on the composite moduli due to the unaltered interfacial interaction. In contrast, a smaller diameter is supposed to give a larger modulus, and this is not observed in this work due to the synergic effects of improved matrix/filler interaction and actual reduced filler volume fraction. The mechanical enhancement by the rod-like structures is more influenced by the loading content, but less so by the size of the nanorod, and it also exhibits superior mechanical performance as compared to nanoparticles. The findings thus extend the current understanding of the nanostructure and mechanical properties of silica nanorod reinforced dental resin composites from an atomic/molecular perspective.
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Affiliation(s)
- Bei Li
- School of Materials Science and Engineering, Research Center for Materials Genome Engineering, Wuhan University of Technology, Wuhan, 430070, China; State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, China.
| | - Lili Tian
- School of Materials Science and Engineering, Research Center for Materials Genome Engineering, Wuhan University of Technology, Wuhan, 430070, China
| | - Lei Pan
- School of Materials Science and Engineering, Research Center for Materials Genome Engineering, Wuhan University of Technology, Wuhan, 430070, China
| | - Jianjun Li
- State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, China
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20
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21
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Cheng Y, Guo Y, He H, Ding W, Diao Y, Huo F. Mechanistic Understanding of CO 2 Adsorption and Diffusion in the Imidazole Ionic Liquid–Hexafluoroisopropylidene Polyimide Composite Membrane. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c00567] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ye Cheng
- College of Mathematics Sciences, Bohai University, Jinzhou 121013, PR China
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Yandong Guo
- College of Mathematics Sciences, Bohai University, Jinzhou 121013, PR China
| | - Hongyan He
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Weilu Ding
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Yanyan Diao
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Feng Huo
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China
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22
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Yang C, Xu R, Tang S, Zhuang Y, Luo L, Liu X. Free H‐Bonding Interaction Sites in Rigid‐Chain Polymers and Their Filling Approach: A Molecular Dynamics Simulation Study. ADVANCED THEORY AND SIMULATIONS 2021. [DOI: 10.1002/adts.202100016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Cheng Yang
- College of Polymer Science and Engineering State Key Laboratory of Polymer Material and Engineering Sichuan University Chengdu 610065 China
| | - Ruopei Xu
- College of Polymer Science and Engineering State Key Laboratory of Polymer Material and Engineering Sichuan University Chengdu 610065 China
| | - Siyi Tang
- College of Polymer Science and Engineering State Key Laboratory of Polymer Material and Engineering Sichuan University Chengdu 610065 China
| | - Yongbing Zhuang
- State Key Laboratory of Biochemical Engineering Institute of Process Engineering University of Chinese Academy of Sciences Beijing 100190 China
| | - Longbo Luo
- College of Polymer Science and Engineering State Key Laboratory of Polymer Material and Engineering Sichuan University Chengdu 610065 China
| | - Xiangyang Liu
- College of Polymer Science and Engineering State Key Laboratory of Polymer Material and Engineering Sichuan University Chengdu 610065 China
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23
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Clarifying the effect of moisture absorption and high-temperature thermal aging on structure and properties of polyimide film at molecular dynamic level. POLYMER 2021. [DOI: 10.1016/j.polymer.2020.123251] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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24
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Wang Z, Zhang M, Han E, Niu H, Wu D. Structure-property relationship of low dielectric constant polyimide fibers containing fluorine groups. POLYMER 2020. [DOI: 10.1016/j.polymer.2020.122884] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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25
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Lin D, Jiang M, Qi S, Wu D. Macromolecular structural evolution of polyimide chains during large-ratio uniaxial fiber orientation process revealed by molecular dynamics simulation. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137847] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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26
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Lin D, Liu Y, Jia Z, Qi S, Wu D. Structural Evolution of Macromolecular Chain During Pre-imidization Process and Its Effects on Polyimide Film Properties. J Phys Chem B 2020; 124:7969-7978. [PMID: 32804503 DOI: 10.1021/acs.jpcb.0c05146] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Pre-imidization has been found to have a determining role on the final properties of polyimide (PI) films. In this work, a series of 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA)/2,2'-bis(trifluoromethyl)benzidine (TFMB) PI models with specified pre-imidization degree (pre-ID) were constructed and analyzed on the basis of molecular dynamic (MD) simulation to reveal the real-time evolution of structure and properties that occurred during the pre-imidization process. The MD results indicated that the Tg of the models increased obviously with increasing pre-ID, which corresponded to the increase of rigid PI chain segments that restricted the mobility of molecular chains. In addition, the increase of fractional free volume and mean square end-to-end distance indicated looser chain packing and more extended chain conformation during the pre-imidization process. As a further verification, a series of corresponding PI films were experimentally prepared via a controlled partially pre-imidization process. Mechanical properties of the prepared PI films were tested to be significantly enhanced, and the coefficient of thermal expansion decreased from 61.5 to 47.6 ppm/°C with pre-ID increasing from 0% to 100%, which could be attributed to the orderly molecular chain arrangement formed during the chemical pre-imidization process, as disclosed by MD simulation. This work paves the way for the observation of the real-time structure and property evolutions of PI materials, especially during the pre-imidization process.
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Affiliation(s)
- Daolei Lin
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Yingzi Liu
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Ziqi Jia
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Shengli Qi
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.,Changzhou Institute of Advanced Materials, Beijing University of Chemical Technology, Changzhou 213164 Jiangsu, China
| | - Dezhen Wu
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.,Changzhou Institute of Advanced Materials, Beijing University of Chemical Technology, Changzhou 213164 Jiangsu, China
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27
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Li Y, Zhang M, Han E, Zhu L, Xiao M, Lei H, Niu H, Wu D. Effect of introduction of fluoromonomer copolymerization on properties of polyimide hollow fibers. HIGH PERFORM POLYM 2020. [DOI: 10.1177/0954008320943264] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The novel copolymerization polyimide (PI) hollow fibers (HFs) of 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) containing –CF3 groups were prepared and investigated through both simulation and experiment. To demonstrate the alteration attributable to the introduction of fluoromonomers, the condensed states of pyromellitic dianhydride (PMDA)/4,4′-oxybisbenzenamine (ODA), PMDA/6FDA/ODA, and 6FDA/ODA PI were constructed by Material Studio, and we simulated the mobility of molecular chain, free volume fraction, and O2/N2 dissolution–diffusion process. The molecular dynamics simulation results demonstrated that the properties of the copolymerized PI system with 6FDA were significantly improved, while the selectivity remained almost unchanged. Then, the films of copolymerized PI and HFs were prepared by the two-step method, and O2/N2 permeability of the PI copolymer films was characterized, indicating that although the gas permeation performance was greatly improved, the selectivity was not so satisfactory. However, the selection factor increased heavily after polydimethylsiloxane coating.
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Affiliation(s)
- Yinong Li
- State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, China
| | - Mengying Zhang
- Jiangsu Shino New Material and Technology Co., Ltd, Changzhou, China
| | - Enlin Han
- Jiangsu Shino New Material and Technology Co., Ltd, Changzhou, China
| | - Li Zhu
- State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, China
| | - Meifeng Xiao
- State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, China
| | - Huanyu Lei
- State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, China
| | - Hongqing Niu
- State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, China
| | - Dezhen Wu
- State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, China
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