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Crystallization and Performance of Polyamide Blends Comprising Polyamide 4, Polyamide 6, and Their Copolymers

Polyamide 4 (PA4) is a biobased and biodegradable polyamide. The high hydrogen bond density of PA4 bestows it with a high melting point that is close to its thermal decomposition temperature, thereby limiting the melt processing of PA4. In this study, PA4 was blended with polyamide 6 (PA6) and furth...

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Autores principales: Zhang, Yajing, Wang, Mingda, Zhang, Di, Wang, Yibing, Wang, Li, Qiu, Yongjun, Wang, Liquan, Chen, Tao, Zhao, Liming
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10459628/
https://www.ncbi.nlm.nih.gov/pubmed/37631455
http://dx.doi.org/10.3390/polym15163399
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author Zhang, Yajing
Wang, Mingda
Zhang, Di
Wang, Yibing
Wang, Li
Qiu, Yongjun
Wang, Liquan
Chen, Tao
Zhao, Liming
author_facet Zhang, Yajing
Wang, Mingda
Zhang, Di
Wang, Yibing
Wang, Li
Qiu, Yongjun
Wang, Liquan
Chen, Tao
Zhao, Liming
author_sort Zhang, Yajing
collection PubMed
description Polyamide 4 (PA4) is a biobased and biodegradable polyamide. The high hydrogen bond density of PA4 bestows it with a high melting point that is close to its thermal decomposition temperature, thereby limiting the melt processing of PA4. In this study, PA4 was blended with polyamide 6 (PA6) and further modified with copolyamide 4/6 (R46). The effects of composition on the crystallization behavior of the blends were studied. The results demonstrated that the binary PA4/PA6 (B46) and ternary PA4/PA6/R46 (B46/R46) blends formed two crystalline phases (PA4- and PA6-rich phases) through crystallization-induced phase separation. With increasing PA6 content, the thermal stability and crystallinity of the B46 blend increased and decreased, respectively, and the contribution of PA6 toward the crystallization of the PA4-rich phase diminished. Molecular dynamics simulations showed the molecular chain orientation of the B46 blends well. The melting points, crystallinities, and grain sizes of the B46/R46 blends were lower than those of the B46 blends. The crystallization of the PA4-rich phase was restrained by the dilution effect of molten-state PA6, and the nucleation and crystallization of the PA6-rich phase were promoted by the presence of crystallized PA4. The B46 blends with 30–40 wt% PA6 had the best mechanical properties.
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spelling pubmed-104596282023-08-27 Crystallization and Performance of Polyamide Blends Comprising Polyamide 4, Polyamide 6, and Their Copolymers Zhang, Yajing Wang, Mingda Zhang, Di Wang, Yibing Wang, Li Qiu, Yongjun Wang, Liquan Chen, Tao Zhao, Liming Polymers (Basel) Article Polyamide 4 (PA4) is a biobased and biodegradable polyamide. The high hydrogen bond density of PA4 bestows it with a high melting point that is close to its thermal decomposition temperature, thereby limiting the melt processing of PA4. In this study, PA4 was blended with polyamide 6 (PA6) and further modified with copolyamide 4/6 (R46). The effects of composition on the crystallization behavior of the blends were studied. The results demonstrated that the binary PA4/PA6 (B46) and ternary PA4/PA6/R46 (B46/R46) blends formed two crystalline phases (PA4- and PA6-rich phases) through crystallization-induced phase separation. With increasing PA6 content, the thermal stability and crystallinity of the B46 blend increased and decreased, respectively, and the contribution of PA6 toward the crystallization of the PA4-rich phase diminished. Molecular dynamics simulations showed the molecular chain orientation of the B46 blends well. The melting points, crystallinities, and grain sizes of the B46/R46 blends were lower than those of the B46 blends. The crystallization of the PA4-rich phase was restrained by the dilution effect of molten-state PA6, and the nucleation and crystallization of the PA6-rich phase were promoted by the presence of crystallized PA4. The B46 blends with 30–40 wt% PA6 had the best mechanical properties. MDPI 2023-08-14 /pmc/articles/PMC10459628/ /pubmed/37631455 http://dx.doi.org/10.3390/polym15163399 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zhang, Yajing
Wang, Mingda
Zhang, Di
Wang, Yibing
Wang, Li
Qiu, Yongjun
Wang, Liquan
Chen, Tao
Zhao, Liming
Crystallization and Performance of Polyamide Blends Comprising Polyamide 4, Polyamide 6, and Their Copolymers
title Crystallization and Performance of Polyamide Blends Comprising Polyamide 4, Polyamide 6, and Their Copolymers
title_full Crystallization and Performance of Polyamide Blends Comprising Polyamide 4, Polyamide 6, and Their Copolymers
title_fullStr Crystallization and Performance of Polyamide Blends Comprising Polyamide 4, Polyamide 6, and Their Copolymers
title_full_unstemmed Crystallization and Performance of Polyamide Blends Comprising Polyamide 4, Polyamide 6, and Their Copolymers
title_short Crystallization and Performance of Polyamide Blends Comprising Polyamide 4, Polyamide 6, and Their Copolymers
title_sort crystallization and performance of polyamide blends comprising polyamide 4, polyamide 6, and their copolymers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10459628/
https://www.ncbi.nlm.nih.gov/pubmed/37631455
http://dx.doi.org/10.3390/polym15163399
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