反式-1,4-聚异戊二烯的非等温结晶动力学

Non-isothermal crystallization kinetics of trans-1,4-polyisoprene

采用差示扫描量热法表征了反式-1,4-聚异戊二烯(TPI)的非等温结晶行为,分别采用Ozawa法、Jeziomy修正的Avrami方程法和Mo法研究了TPI的非等温结晶动力学。结果表明,随着降温速率的增加,TPI的结晶放热峰温向低温方向偏移,且结晶峰形变宽,半结晶时间逐渐缩短;Ozawa法和Jeziomy法均不能很好地描述TPI的非等温结晶过程,Mo法可以很好地描述TPI的非等温结晶过程;根据Kissinger方程求得TPI的结晶活化能为6.35 kJ/mol。

The non-isothermal crystallization behavior of trans-1,4-polyisoprene（TPI） was characterized by differential scanning calorimetry,and the non-isothermal crystallization kinetics of TPI was studied according to Ozawa,Avrami equation modified by Jeziomy and Mo methods.The results showed that with increasing cooling rate,the temperature of crystallization exothermic peak of TPI shifted to lower temperature,peak shape became wide,and half crystallization time decreased.Mo method could accurately describe the non-isothermal crystallization process,but Ozawa method and Jeziomy method couldn＇t.The activation energy of crystallization of TPI obtained by Kissinger equation was 6.35 kJ/mol.