原位复合阻燃尼龙6的非等温动力学研究

Non-isothermal crystallization kinetic study on flame retardant nylon 6 via in-situ polymerization

采用差示扫描量热法研究了原位聚合反应制备阻燃尼龙6的非等温结晶行为,用Jeziorny法和莫志深法对其动力学过程进行了分析。结果表明:由于阻燃剂起到异相成核作用,使晶核的生长变快,提高了阻燃尼龙6的结晶温度和成核速率。随降温速率的增加,其结晶峰从高温向低温方向移动,峰形变宽,结晶时间缩短。同时阻燃剂在尼龙6分子链中存在相互作用力,阻碍了尼龙6分子链在结晶过程中的运动,导致结晶活化能提高,晶体生长速度下降,结晶度降低。

The non-isothermal crystallization behavior of flame retardant nylon 6 prepared via in-situ polymerization was studied by differential scanning calorimetry. The kinetic process was analyzed by Jeziorny and Mo Zhishen methods. The results showed that the flame retardant accelerated the nucleus growth and elevated the crystallization temperature and nucleating rate of flame retardant nylon 6 oweing to the heterogeneous nucleation. The crystallization peak moved toward low temperature from high temperature, the peak shape was widened and the crystallization time was shortened as the cooling rate was raised. The interaction between the flame retardant and the molecular chain of nylon 6 suppressed the movement of nylon 6 molecular chain in the crystallization process, causing the activation energy to increase, crystal growth rate to reduce and the crystallinity to decrease.