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用挤出机熔融共混法，以双２口恶唑啉和双酰基双内酰胺化合物为扩链剂，对ＰＡ６进行化学扩链，使ＰＡ６的分子量由１６．７ｋｇ／ｍｏｌ提高到２１．０ｋｇ／ｍｏｌ，偶联效率最高可达７０％；同时考查了扩链剂用量、铜盐、共混温度与时间以及后热处理对扩链效果的影响。
Melt extrusion method with an extruder to double 2 mouth oxazoline and double acyl dilactam compound chain extender, PA6 chemical chain extension, so that the molecular weight of PA6 increased from 16.7kg / mol to 21 .0kg / mol, coupling efficiency up to 70%; also examined the amount of chain extender, copper salt, blending temperature and time and after heat treatment on the chain extension effect.