Polyamide from lactams by reactive rotational molding via anionic ring-opening polymerization: Optimization of processing parameters
Polyamide from lactams by reactive rotational molding via anionic ring-opening polymerization: Optimization of processing parameters
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DOI：
10.3144/expresspolymlett.2013.7
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发表时间：
2013-01-01
影响因子：
3.3
通讯作者：
Abdelhedi, R.
中科院分区：
文献类型：
--
作者：
Barhoumi, N.;Maazouz, A.;Abdelhedi, R.
研究了以epsilon-己内酰胺（apap6）为原料，通过阴离子开环活化聚合制备PA6的反应旋塑工艺。以己内酰胺钠（C10）和己内酰胺溴化镁（C1）为催化剂，以二官能团己二亚甲基-1,6-二氨基己内酰胺（C20）为活化剂。通过动态流变学和差示扫描量热法测定了epsilon-己内酰胺阴离子聚合成聚酰胺6的动力学。讨论了聚合温度、不同催化剂/活化剂组合及浓度等工艺参数对聚合动力学的影响。150摄氏度的温度被证明是最合适的。还发现在PA6聚合过程中可能会发生结晶，并且C1/C20的组合非常适合，因为它允许合适的诱导时间。绘制等粘度曲线，以确定RRM的可用加工窗口。将所制得的PA6的性能与常规滚塑的PA6进行了比较。结果表明，较低的循环时间和增加的拉伸性能，在弱变形。
A reactive rotational molding (RRM) process was developed to obtain a PA6 by activated anionic ring-opening polymerization of epsilon-caprolactam (APA6). Sodium caprolactamate (C10) and caprolactam magnesium bromide (C1) were employed as catalysts, and difunctional hexamethylene-1,6-dicarbamoylcaprolactam (C20) was used as an activator. The kinetics of the anionic polymerization of epsilon-caprolactam into polyamide 6 was monitored through dynamic rheology and differential scanning calorimetry measurements. The effect of the processing parameters, such as the polymerization temperature, different catalyst/ activator combinations and concentrations, on the kinetics of polymerization is discussed. A temperature of 150 degrees C was demonstrated to be the most appropriate. It was also found that crystallization may occur during PA6 polymerization and that the combination C1/C20 was well suited as it permitted a suitable induction time. Isoviscosity curves were drawn in order to determine the available processing window for RRM. The properties of the obtained APA6 were compared with those of a conventionally rotomolded PA6. Results pointed at lower cycle times and increased tensile properties at weak deformation.