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对萃取后的尼龙6切片进行了固相缩聚以提高其相对黏度(η_r),研究了不同反应时间和温度对增黏效果的影响。采用乌式黏度计、端基滴定法、热重分析法(TGA)、X射线衍射法(XRD)和毛细管流变仪对样品进行了测试。实验结果表明,尼龙6切片的热稳定性基本不变,切片所含晶型只有α单斜晶系,并未出现晶型的转变,出现了晶面的择优取向生长现象。在反应温度为190℃,反应时间为12h时,固相缩聚后的尼龙6切片相对黏度达到3.2,初始分解温度为412.3℃,最大分解温度为469.5℃,性能得到提高。
Solid phase polycondensation of the extracted nylon 6 chips was carried out to increase its relative viscosity (η_r). The effect of different reaction time and temperature on the viscosity increasing effect was studied. The samples were tested by U-vis viscometer, end titration, TGA, XRD and capillary rheometer. The experimental results show that the thermal stability of the nylon 6 slice is basically the same, the crystal form of the slice is only α monoclinic, and the transition of the crystal form is not observed. The preferred orientation growth of the crystal face appears. When the reaction temperature is 190 ℃ and the reaction time is 12h, the relative viscosity of the nylon 6 chips after solid phase polycondensation reaches 3.2, the initial decomposition temperature is 412.3 ℃, the maximum decomposition temperature is 469.5 ℃, and the performance is improved.