The rigid amorphous fraction of cold-crystallized polyamide 6

The rigid amorphous fraction of cold-crystallized polyamide 6
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冷结晶聚酰胺 6 的刚性无定形部分

DOI:
10.1016/j.polymer.2012.08.017
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发表时间:
2012
期刊:
影响因子:
4.6
通讯作者:
Androsch
Androsch
中科院分区:
化学2区
文献类型:
--
作者:
Kolesov;Androsch

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分析了加热时最初完全无定形玻璃状样品有序/结晶的聚酰胺 6 的刚性无定形部分 (RAF)。最高退火温度的变化允许产生具有不同数量、完整性和形态的中间相或晶体的部分有序样品。在中间相分数介于 0% 和 20% 之间的样品中,RAF 随着中间相分数的增加而增加,达到最大值 50%。通过高温退火实现的有序相的分数和完善性的进一步增加导致RAF的降低。流动和刚性无定形部分之间的比率随着结晶度的增加而增加,这表明高结晶度样品中晶体和无定形相的解偶联增加,并证实了先前在聚对苯二甲酸乙二醇酯和全同立构聚丙烯上获得的结果。该研究对通过热容量增量的量热分析和对流动非晶部分失透时损耗因子峰面积的动态机械分析估算出的 RAF 进行了比较,并讨论了冷有序/结晶 PA 6 的相组成对刚度的影响。
The rigid amorphous fraction (RAF) of polyamide 6 ordered/crystallized on heating initially fully amorphous glassy samples has been analyzed. Variation of the maximum annealing temperature allowed generation of partially ordered samples with different amount, perfection and morphology of mesophase or crystals. In samples with low fraction of mesophase between 0 and 20 %, the RAF increases with increasing mesophase fraction to reach a maximum value of 50 %. Further increase of the fraction and perfection of the ordered phase achieved by annealing at high temperature leads to a decrease of the RAF. The ratio between mobile and rigid amorphous fractions increases with increasing crystallinity, suggesting increasing decoupling of crystals and amorphous phase in samples of high crystallinity, and confirming results obtained earlier on poly(ethylene terephthalate) and isotactic polypropylene. The study contains a comparison of the RAF estimated from calorimetric analysis of the heat-capacity increment and dynamic-mechanical analysis of the area of the loss-factor peak on devitrification the mobile amorphous fraction, and a discussion of the effect of the phase composition of cold-ordered/crystallized PA 6 on the stiffness.
DOI: 10.1007/s10973-012-2326-2
发表时间: 2012
影响因子: 4.4
作者:
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通讯作者: B. Wunderlich
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