聚苯硫醚熔体结晶自成核作用的研究——聚苯硫醚多次扫描的熔体结晶行为

用差示扫描量热法多次扫描研究聚苯硫醚(PPS)在不同的熔融温度(T_(mrh)以及交变温度熔融对其结晶行为的影响 结果表明:PPS的结晶温度(T)随T_(mrh)提高而降低;但T_(mrh)低时,PPS的T随扫描次数增加而提高。随扫描次数增加,PPS呈现多结晶峰。同一试样交变温度熔融,低温溶融结晶的T总是比高温溶融结晶的T高,而且与扫描次数无关,归结于PPS的自成核作用。

自成核对聚对苯二甲酸1,3-丙二酯结晶行为的影响

The effects of self-seeding nucleation on the crystallization behavior and properties of poly(trimethylene terephthalate) were studied.Differential scanning calorimetry(DSC) results indicated that the crystallization temperature of poly(trimethylene terephthalate) increased obviously(increased about 20℃) after the process of self-seeding nucleation.The results of polarized light microscopy(PLM) showed that the spherulite size decreased markedly from 40 μm to 8 μm.