生物基耐高温PA10T10F的合成及非等温结晶动力学

在耐高温聚酰胺聚对苯二甲酰癸二胺(PA10T)的基础上,共聚一定比例的芳香型生物基单体2,5-呋喃二甲酸,通过优化聚合工艺,合成高生物基碳含量的耐高温PA10T10F.差示扫描量热(DSC)法研究PA10T和PA10T10F的非等温结晶动力学过程.Jeziorny法和Mo法均适用于PA10T和PA10T10F的非等温结晶动力学研究,结果表明,PA10T10F前期稳定以三维球状生长.使用Kissinger法计算结晶活化能,PA10T的结晶活化能为–276.05 kJ/mol,PA10T10F的结晶活化能为–283.74 kJ/mol.PA10T10F结晶过程中放热更多,结晶能力更强.研究表明,由于呋喃环的非对称结构,PA10T10F分子链段刚性更强,链间静电力较大,分子间聚集趋势增强,因此PA10T10F具有更强的结晶能力和更快的结晶速率.

Synthesis and Non-isothermal Crystallization Kinetics of Bio-based High Temperature Resistant Polyamide PA10T10F

On the basis of high temperature resistant polyamide poly(p-phenylene terephthalamide)(PA10T),bio-based monomer 2,5-furandicarboxylic acid was copolymerized to obtain high bio-based carbon content in PA10T10F. The non-isothermal crystallization kinetics of PA10T and PA10T10F were studied by differential scanning calorimetry (DSC). It is found that with the increase of the cooling rate,the crystallization temperature decreases,the crystallization range becomes wider,and the crystallization time is shortened. Both the Jeziorny method and the Mo method were applicable to the non-isothermal crystallization kinetics of PA10T and PA10T10F. The results show that PA10T10F grows in three-dimensional in the early stage. The crystallization activation energy is calculated by the Kissinger method. The crystallization activation energy of PA10T is –276.05 kJ/mol,and –283.74 kJ/ mol of PA10T10F. With a higher absolute value of activation energy,PA10T10F releases more heat during crystallization,and has stronger crystallization ability. The experimental study shows that,PA10T10F has stronger crystallization ability and faster crystallization rate.