文献类型：期刊文献

英文题名：Molecular dynamics simulation and non-isothermal crystallization kinetics of polyamide 4 and different bio-based polyamide blends

作者：Zhang, Yajing[1,2];Wang, Mingda[1,2];Wang, Liquan[4];Chen, Tao[2,4];Feng, Weisheng[4];Wang, Tianyi[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, China Natl Light Ind, Key Lab Biobased Mat Engn, Shanghai 200237, Peoples R China;[3]SCICBT, 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：25

期号：37

起止页码：25309

外文期刊名：PHYSICAL CHEMISTRY CHEMICAL PHYSICS

收录：;EI(收录号：20233914774483);WOS:【SCI-EXPANDED(收录号:WOS:001070279400001)】；

基金：This work was supported by the Shanghai Science and Technology Innovation Action Plan [grant number 21DZ2205900], and the Natural Science Foundation of Shanghai, China [grant number 21ZR1416000].

语种：英文

外文关键词：Activation energy - Blending - Crystallinity - Crystallization kinetics - Isotherms - Phase separation

摘要：The effects of the structural units and blending ratio on the crystallization behavior of blends of polyamide 4 (PA4) with polyamide 56 (PA56) and polyamide 11 (PA11) were studied using molecular dynamics simulations and non-isothermal crystallization kinetics. The simulation results show that the crystallinity of PA4/PA56 blends (B4/56) with a PA56 content of 30-50% was 3.5-10.8% lower than that of B4/56 with a PA56 content of 20%, and the crystallinity of PA4/PA11 blends (B4/11) decreased by 9.5% as PA11 content increased from 20% to 50%. The experimental results show that both B4/56 and B4/11 form PA4- and PA56-rich (PA11-rich) phases through crystallization-induced phase separation. The interplanar spacing of the PA4-rich phase of B4/56 changed relative to that of PA4, indicating that some PA56 entered the PA4-rich phase unit cell. As the PA56 content increased from 20% to 50%, the crystallinity of B4/56 decreased by 11.2%, and the crystallization-induced phase separation grew distinct. The B4/56 with a higher PA4 content crystallized more easily. As the PA11 content increased from 20% to 50%, the crystallinity of B4/11 decreased by 12.5%, and PA11 barely participated in the crystallization of the PA4-rich phase. The blending ratio had no significant effect on the crystallization rate and crystal-growth degree of B4/11, and the non-isothermal crystallization activation energy of B4/11 was significantly higher than that of B4/56, indicating that the crystallization ability of the B4/11 blend system is worse. This study provides a theoretical basis for the design and performance regulation of PA4-based polyamide blends. The structural unit of PAX determines the crystallization behavior of the PA4/PAX blends, and the degree of participation of PAX in the crystallization of the PA4 phase differs during cooling crystallization.