文献类型：期刊文献

英文题名：Crystallization behaviour of polyamide 4 and its effect on melting point

作者：Wang, Mingda[1,2,3];Zhang, Yajing[1,2,3];Zhan, Fangke[1,2,3];Qiu, Yongjun[1,2,3];Chen, Tao[2,3,4];Zhao, Liming[1,2,3]

机构：[1]East China Univ Sci & Technol, Sch Biotechnol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China;[2]China Natl Light Ind Council, Key Lab Biobased Mat Engn, 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：2024

卷号：291

外文期刊名：POLYMER

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001146599400001)】；

基金：This work was supported by the Research and Development of Technical Standards for Bio-based Material Polybutyrolactam Project (21DZ2205900), the National Key Research and Development Program of China (2022YFC2104500), the 111 Project (B18022), and Shanghai Sailing Program (20YF1409900).

语种：英文

外文关键词：Polyamide 4; Crystallize; Melting point

摘要：Polyamide 4 (PA4) has received widespread attention as a bio-based polyamide exhibiting biodegradability. However, the melting and degradation processes of PA4 occur simultaneously, making it difficult to perform thermal processing. To expand the difference between the melting point temperature (T-m) and the thermal decomposition temperature (T-td), the crystallization and melting processes of PA4 were investigated to design strategies for regulating the crystallization. The isothermal crystallization and cold crystallization properties of PA4 were investigated with flash DSC. A special self-nucleation phenomenon which slowed the rate of recrystallization has been discovered. It confirms the significant differences in the morphology of crystals generated at differences temperatures. By controlling the crystallization process, the end-of-melt temperature (T-95) was greatly reduced. Nucleation and crystal growth at different temperatures provided a low melting temperature (T-95 = 246 degrees C), which was 20 degrees C lower than that for isothermal crystallization.