不同硬度热塑性聚酰胺弹性体非等温结晶动力学

Non-isothermal Crystallization Kinetics of TPAE with Different Hardness

采用差式扫描量热仪研究了三种不同硬度牌号的热塑性聚酰胺弹性体(TPAE)在不同降温速率下的非等温结晶行为过程。结果表明,随着降温速率的提高,结晶峰向低温移动,结晶峰变宽;另外,TPAE硬度增加,结晶焓绝对值得到明显提升,结晶峰温度总体升高。Jeziorny法研究显示,随着降温速率变快,结晶速率提高,结晶时间缩短。低硬度牌号3010SN01的TAPE结晶以二维生长为主;中硬度牌号4510SN01的TAPE在结晶初期以多维生长为主,末期以二维生长为主;高硬度牌号6510SN01的TAPE结晶以多维生长为主。Mo法模型显示结晶速率总体上随着相对结晶度的提高以及硬度的增加而增大。用Kissinger法计算出牌号为3010SN01,4510SN01,6510SN01的TAPE的结晶活化能分别为–29.46,–101.62,–69.82 kJ/mol。

Differential scanning calorimeter was used to study the non-isothermal crystallization behavior of three different hardness grades of thermoplastic polyamide elastomer(TPAE)at different cooling rates.It is found that with the increase of cooling rate,the crystallization peaks move to low temperature and become wider,in addition,with the increase of TPAE hardness,the absolute values of crystallization enthalpy are improved obviously and the crystallization peak temperatures are increased in total.The results of Jeziorny method show that with the increase of cooling rate,the crystallization rates are increased and the crystallization times are shorten.The crystal growth of TAPE of low hardness grade 3010SN01 is mainly two-dimensional growth,TAPE of medium hardness grade 4510SN01 is mainly multi-dimensional growth in the initial stage and two-dimensional growth in the final stage,TAPE of high hardness grade 6510SN01 is mainly multi-dimensional growth.The model of Mo method shows that crystallization rates increase with the increase of relative crystallinity and hardness in total.The crystallization activation energy of TPAE of 3010SN01,4510SN01,6510SN01 calculated by the Kissinger method are–29.46,–101.62,–69.82 kJ/mol respectively.