小本体聚丙烯及其接枝丙烯酰胺的非等温结晶动力学

采用DSC方法测试了小本体聚丙烯（PP）及其接枝丙烯酰胺（PP-g-AM）非等温结晶过程的释热情况，并对两组实验数据分别运用Jeziorny法和Mo法进行了处理和比较.结果表明，两种方法均可准确地描述PP及PP-g-AM的非等温结晶过程.PP接枝前后Avrami指数n无明显改变，表明两者结晶机理基本相同;由Jeziorny法得到接枝产物的校正晶体增长速率常数Z_c略大于纯PP的Z_c;由Mo法计算得出，PP-g-AM的F(T)值略小于纯PP的F（T），表明接枝物的相对结晶速率略大于纯PP的相对结晶速率.

Non-isothermal crystallization kinetics of batch bulk polypropylene and acrylamide graft polypropylene

The non-isothermal crystallization kinetics of batch bulk polypropylene (PP) and acrylamide graft polypropylene (PP-g-AM) were studied by means of differential scanning calorimetry (DSC).The Jeziorny method and Mo method were used to analyze the DSC data.The results showed that both methods could describe the non-isothermal crystallization processes of PP and PP-g-AM accurately.The Avrami exponent did not change after grafting obviously, which indicated that the crystallization mechanism of PP-g-AM was almost the same as PP.The values of modified crystal growth constant Z_c of PP-g-AM were a little higher than those of pure PP. The values of F(T) of PP-g-AM were a little lower than those of pure PP, which indicated that PP-g-AM had a faster rate of crystallization.The result conformed to the slight degradation of PP chains in the grafting process.