用柔和混合法制备尼龙6/多壁碳纳米管(PA6/MWNTs)复合材料,纳米粒子的良好分散使复合材料出现熔融双峰现象.采用调幅式差示扫描量热仪(MDSC)研究了熔融双峰产生的原因和降温速率、MWNT含量对复合材料熔融行为的影响.结果表明,降温过程中,良好分散的MWNTs在基体中既起显著的异相成核作用,促进基体结晶,又限制了分子链排入晶格,抑制了晶体的生长,导致熔融双峰的出现.同时,降温速率越快,基体结晶时间越短,使低温熔融峰向低温偏移.MWNTs含量增加,异相成核作用越明显,形成的晶体越完善,使低温熔融峰向高温偏移.
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