文献类型：期刊文献

英文题名：Crystallization and Performance of Polyamide Blends Comprising Polyamide 4, Polyamide 6, and Their Copolymers

作者：Zhang, Yajing[1,2];Wang, Mingda[1,2];Zhang, Di[1,2];Wang, Yibing[1,2];Wang, Li[1,2];Qiu, Yongjun[1,2,3];Wang, Liquan[4];Chen, Tao[2,4];Zhao, Liming[1,2,3]

机构：[1]East China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Biobased Mat Engn, China Natl Light Ind, Shanghai 200237, Peoples R China;[3]Shanghai Collaborat Innovat Ctr Biomfg Technol SCI, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Shanghai 200237, Peoples R China

年份：2023

卷号：15

期号：16

外文期刊名：POLYMERS

收录：;EI(收录号：20233514643578);WOS:【SCI-EXPANDED(收录号:WOS:001056828000001)】；

基金：This research was funded by the Research and Development of Technical Standards for Bio-based Material Polybutyrolactam Project [grant number 21DZ2205900], the National Key R & amp;D Program of China [grant number 2017YFB0309302], the 111 Project [grant number B18022], the Fundamental Research Funds for the Central Universities [grant number 22221818014], and the Natural Science Foundation of Shanghai, China [grant number 21ZR1416000].

语种：英文

外文关键词：polyamide 4; PA4/PA6 blends; copolyamides 4/6; crystallization

摘要：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.