Fracture behaviors of double network elastomers with dynamic non-covalent linkages: A molecular dynamics study
Hybrid double network (HDN) elastomers, containing the physical interaction (PI) network formed by non-covalent interaction and the chemically cross-linked (C-CL) network, attract enormous interest due to the excellent toughness. Herein, the fracture process of HDN elastomers is elucidated via coars...
Ausführliche Beschreibung
Autor*in: |
Zhao, Ruiqi [verfasserIn] Wang, Yu [verfasserIn] Gong, Xinglong [verfasserIn] |
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Format: |
E-Artikel |
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Sprache: |
Englisch |
Erschienen: |
2022 |
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Schlagwörter: |
Hybrid double network elastomers |
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Übergeordnetes Werk: |
Enthalten in: Polymer - Oxford : Elsevier Science, 1960, 244 |
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Übergeordnetes Werk: |
volume:244 |
DOI / URN: |
10.1016/j.polymer.2022.124670 |
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Katalog-ID: |
ELV007530161 |
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520 | |a Hybrid double network (HDN) elastomers, containing the physical interaction (PI) network formed by non-covalent interaction and the chemically cross-linked (C-CL) network, attract enormous interest due to the excellent toughness. Herein, the fracture process of HDN elastomers is elucidated via coarse-grained molecular dynamics simulation methods, which is essential to improve the toughness. The evolution of microstructures, including voids, and clusters serving as cross-linked points in the PI network, is analyzed to understand the fracture behavior. Secondly, the influence of PI strength on toughness is investigated. As the PI strength increases, the dissociation of clusters dissipates more energy. In addition, more bond scissions in the C-CL network also contribute to the promotion of toughness. In summary, this work provides the molecular perspective of the fracture and contributes to preparing HDN elastomers with high toughness. | ||
650 | 4 | |a Hybrid double network elastomers | |
650 | 4 | |a Coarse-grained molecular dynamics simulation | |
650 | 4 | |a Fracture process | |
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700 | 1 | |a Gong, Xinglong |e verfasserin |4 aut | |
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10.1016/j.polymer.2022.124670 doi (DE-627)ELV007530161 (ELSEVIER)S0032-3861(22)00157-4 DE-627 ger DE-627 rda eng 540 DE-600 35.80 bkl 51.70 bkl 58.22 bkl Zhao, Ruiqi verfasserin aut Fracture behaviors of double network elastomers with dynamic non-covalent linkages: A molecular dynamics study 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Hybrid double network (HDN) elastomers, containing the physical interaction (PI) network formed by non-covalent interaction and the chemically cross-linked (C-CL) network, attract enormous interest due to the excellent toughness. Herein, the fracture process of HDN elastomers is elucidated via coarse-grained molecular dynamics simulation methods, which is essential to improve the toughness. The evolution of microstructures, including voids, and clusters serving as cross-linked points in the PI network, is analyzed to understand the fracture behavior. Secondly, the influence of PI strength on toughness is investigated. As the PI strength increases, the dissociation of clusters dissipates more energy. In addition, more bond scissions in the C-CL network also contribute to the promotion of toughness. In summary, this work provides the molecular perspective of the fracture and contributes to preparing HDN elastomers with high toughness. Hybrid double network elastomers Coarse-grained molecular dynamics simulation Fracture process Wang, Yu verfasserin aut Gong, Xinglong verfasserin aut Enthalten in Polymer Oxford : Elsevier Science, 1960 244 Online-Ressource (DE-627)32051613X (DE-600)2013972-X (DE-576)093888422 0032-3861 nnns volume:244 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2411 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 35.80 Makromolekulare Chemie 51.70 Polymerwerkstoffe Kunststoffe Werkstoffkunde 58.22 Kunststofftechnologie AR 244 |
spelling |
10.1016/j.polymer.2022.124670 doi (DE-627)ELV007530161 (ELSEVIER)S0032-3861(22)00157-4 DE-627 ger DE-627 rda eng 540 DE-600 35.80 bkl 51.70 bkl 58.22 bkl Zhao, Ruiqi verfasserin aut Fracture behaviors of double network elastomers with dynamic non-covalent linkages: A molecular dynamics study 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Hybrid double network (HDN) elastomers, containing the physical interaction (PI) network formed by non-covalent interaction and the chemically cross-linked (C-CL) network, attract enormous interest due to the excellent toughness. Herein, the fracture process of HDN elastomers is elucidated via coarse-grained molecular dynamics simulation methods, which is essential to improve the toughness. The evolution of microstructures, including voids, and clusters serving as cross-linked points in the PI network, is analyzed to understand the fracture behavior. Secondly, the influence of PI strength on toughness is investigated. As the PI strength increases, the dissociation of clusters dissipates more energy. In addition, more bond scissions in the C-CL network also contribute to the promotion of toughness. In summary, this work provides the molecular perspective of the fracture and contributes to preparing HDN elastomers with high toughness. Hybrid double network elastomers Coarse-grained molecular dynamics simulation Fracture process Wang, Yu verfasserin aut Gong, Xinglong verfasserin aut Enthalten in Polymer Oxford : Elsevier Science, 1960 244 Online-Ressource (DE-627)32051613X (DE-600)2013972-X (DE-576)093888422 0032-3861 nnns volume:244 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2411 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 35.80 Makromolekulare Chemie 51.70 Polymerwerkstoffe Kunststoffe Werkstoffkunde 58.22 Kunststofftechnologie AR 244 |
allfields_unstemmed |
10.1016/j.polymer.2022.124670 doi (DE-627)ELV007530161 (ELSEVIER)S0032-3861(22)00157-4 DE-627 ger DE-627 rda eng 540 DE-600 35.80 bkl 51.70 bkl 58.22 bkl Zhao, Ruiqi verfasserin aut Fracture behaviors of double network elastomers with dynamic non-covalent linkages: A molecular dynamics study 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Hybrid double network (HDN) elastomers, containing the physical interaction (PI) network formed by non-covalent interaction and the chemically cross-linked (C-CL) network, attract enormous interest due to the excellent toughness. Herein, the fracture process of HDN elastomers is elucidated via coarse-grained molecular dynamics simulation methods, which is essential to improve the toughness. The evolution of microstructures, including voids, and clusters serving as cross-linked points in the PI network, is analyzed to understand the fracture behavior. Secondly, the influence of PI strength on toughness is investigated. As the PI strength increases, the dissociation of clusters dissipates more energy. In addition, more bond scissions in the C-CL network also contribute to the promotion of toughness. In summary, this work provides the molecular perspective of the fracture and contributes to preparing HDN elastomers with high toughness. Hybrid double network elastomers Coarse-grained molecular dynamics simulation Fracture process Wang, Yu verfasserin aut Gong, Xinglong verfasserin aut Enthalten in Polymer Oxford : Elsevier Science, 1960 244 Online-Ressource (DE-627)32051613X (DE-600)2013972-X (DE-576)093888422 0032-3861 nnns volume:244 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2411 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 35.80 Makromolekulare Chemie 51.70 Polymerwerkstoffe Kunststoffe Werkstoffkunde 58.22 Kunststofftechnologie AR 244 |
allfieldsGer |
10.1016/j.polymer.2022.124670 doi (DE-627)ELV007530161 (ELSEVIER)S0032-3861(22)00157-4 DE-627 ger DE-627 rda eng 540 DE-600 35.80 bkl 51.70 bkl 58.22 bkl Zhao, Ruiqi verfasserin aut Fracture behaviors of double network elastomers with dynamic non-covalent linkages: A molecular dynamics study 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Hybrid double network (HDN) elastomers, containing the physical interaction (PI) network formed by non-covalent interaction and the chemically cross-linked (C-CL) network, attract enormous interest due to the excellent toughness. Herein, the fracture process of HDN elastomers is elucidated via coarse-grained molecular dynamics simulation methods, which is essential to improve the toughness. The evolution of microstructures, including voids, and clusters serving as cross-linked points in the PI network, is analyzed to understand the fracture behavior. Secondly, the influence of PI strength on toughness is investigated. As the PI strength increases, the dissociation of clusters dissipates more energy. In addition, more bond scissions in the C-CL network also contribute to the promotion of toughness. In summary, this work provides the molecular perspective of the fracture and contributes to preparing HDN elastomers with high toughness. Hybrid double network elastomers Coarse-grained molecular dynamics simulation Fracture process Wang, Yu verfasserin aut Gong, Xinglong verfasserin aut Enthalten in Polymer Oxford : Elsevier Science, 1960 244 Online-Ressource (DE-627)32051613X (DE-600)2013972-X (DE-576)093888422 0032-3861 nnns volume:244 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2411 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 35.80 Makromolekulare Chemie 51.70 Polymerwerkstoffe Kunststoffe Werkstoffkunde 58.22 Kunststofftechnologie AR 244 |
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10.1016/j.polymer.2022.124670 doi (DE-627)ELV007530161 (ELSEVIER)S0032-3861(22)00157-4 DE-627 ger DE-627 rda eng 540 DE-600 35.80 bkl 51.70 bkl 58.22 bkl Zhao, Ruiqi verfasserin aut Fracture behaviors of double network elastomers with dynamic non-covalent linkages: A molecular dynamics study 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Hybrid double network (HDN) elastomers, containing the physical interaction (PI) network formed by non-covalent interaction and the chemically cross-linked (C-CL) network, attract enormous interest due to the excellent toughness. Herein, the fracture process of HDN elastomers is elucidated via coarse-grained molecular dynamics simulation methods, which is essential to improve the toughness. The evolution of microstructures, including voids, and clusters serving as cross-linked points in the PI network, is analyzed to understand the fracture behavior. Secondly, the influence of PI strength on toughness is investigated. As the PI strength increases, the dissociation of clusters dissipates more energy. In addition, more bond scissions in the C-CL network also contribute to the promotion of toughness. In summary, this work provides the molecular perspective of the fracture and contributes to preparing HDN elastomers with high toughness. Hybrid double network elastomers Coarse-grained molecular dynamics simulation Fracture process Wang, Yu verfasserin aut Gong, Xinglong verfasserin aut Enthalten in Polymer Oxford : Elsevier Science, 1960 244 Online-Ressource (DE-627)32051613X (DE-600)2013972-X (DE-576)093888422 0032-3861 nnns volume:244 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2411 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 35.80 Makromolekulare Chemie 51.70 Polymerwerkstoffe Kunststoffe Werkstoffkunde 58.22 Kunststofftechnologie AR 244 |
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Elektronische Aufsätze |
author-letter |
Zhao, Ruiqi |
doi_str_mv |
10.1016/j.polymer.2022.124670 |
dewey-full |
540 |
author2-role |
verfasserin |
title_sort |
fracture behaviors of double network elastomers with dynamic non-covalent linkages: a molecular dynamics study |
title_auth |
Fracture behaviors of double network elastomers with dynamic non-covalent linkages: A molecular dynamics study |
abstract |
Hybrid double network (HDN) elastomers, containing the physical interaction (PI) network formed by non-covalent interaction and the chemically cross-linked (C-CL) network, attract enormous interest due to the excellent toughness. Herein, the fracture process of HDN elastomers is elucidated via coarse-grained molecular dynamics simulation methods, which is essential to improve the toughness. The evolution of microstructures, including voids, and clusters serving as cross-linked points in the PI network, is analyzed to understand the fracture behavior. Secondly, the influence of PI strength on toughness is investigated. As the PI strength increases, the dissociation of clusters dissipates more energy. In addition, more bond scissions in the C-CL network also contribute to the promotion of toughness. In summary, this work provides the molecular perspective of the fracture and contributes to preparing HDN elastomers with high toughness. |
abstractGer |
Hybrid double network (HDN) elastomers, containing the physical interaction (PI) network formed by non-covalent interaction and the chemically cross-linked (C-CL) network, attract enormous interest due to the excellent toughness. Herein, the fracture process of HDN elastomers is elucidated via coarse-grained molecular dynamics simulation methods, which is essential to improve the toughness. The evolution of microstructures, including voids, and clusters serving as cross-linked points in the PI network, is analyzed to understand the fracture behavior. Secondly, the influence of PI strength on toughness is investigated. As the PI strength increases, the dissociation of clusters dissipates more energy. In addition, more bond scissions in the C-CL network also contribute to the promotion of toughness. In summary, this work provides the molecular perspective of the fracture and contributes to preparing HDN elastomers with high toughness. |
abstract_unstemmed |
Hybrid double network (HDN) elastomers, containing the physical interaction (PI) network formed by non-covalent interaction and the chemically cross-linked (C-CL) network, attract enormous interest due to the excellent toughness. Herein, the fracture process of HDN elastomers is elucidated via coarse-grained molecular dynamics simulation methods, which is essential to improve the toughness. The evolution of microstructures, including voids, and clusters serving as cross-linked points in the PI network, is analyzed to understand the fracture behavior. Secondly, the influence of PI strength on toughness is investigated. As the PI strength increases, the dissociation of clusters dissipates more energy. In addition, more bond scissions in the C-CL network also contribute to the promotion of toughness. In summary, this work provides the molecular perspective of the fracture and contributes to preparing HDN elastomers with high toughness. |
collection_details |
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title_short |
Fracture behaviors of double network elastomers with dynamic non-covalent linkages: A molecular dynamics study |
remote_bool |
true |
author2 |
Wang, Yu Gong, Xinglong |
author2Str |
Wang, Yu Gong, Xinglong |
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doi_str |
10.1016/j.polymer.2022.124670 |
up_date |
2024-07-06T16:34:52.141Z |
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