氯化钙对尼龙6无定形转变过程的在位红外研究

采用在位红外分析、X射线衍射方法研究了氯化钙对尼龙 6结晶的影响。结果表明 ,随尼龙 6中氯化钙含量的增加 ,尼龙 6的结晶度逐渐减小直至变为无定形态。由于氢键作用使尼龙 6分子链规整排列产生结晶 ,因此文章通过在位红外光谱方法研究了尼龙 6 /氯化钙复合材料中与氢键相关的胺基、酰胺Ⅰ带和酰胺Ⅱ带随温度及氯化钙含量的变化情况 ,证实了钙离子能通过与尼龙 6分子链上的羰基发生配位作用 ,插入尼龙 6分子链 ,破坏尼龙 6的氢键 ,降低了尼龙 6分子链的规整排列 ,使尼龙 6的结晶度减小 ,最终使尼龙 6由结晶态转变为无定形态

Time-resolved FTIR Study of Amorphous Process of Nylon 6 with Calcium Chloride

The influence of calcium chloride on the crystallinity of nylon 6 was studied by means of time-resolved FTIR, WADX and DSC. The results show that the crystallinity of nylon 6 decreased with the increase of CaCl2, and finally nylon 6 changed from crystal phase to amorphous phase. Because hydrogen bond is the main reason that nylon has three-dimensional ordered structure and forms crystalline phase, we further studied the changes of wave number of NH, amide I and amide II related to hydrogen bond in CaCl2/PA6 complexes by time-resolved FTIR. These studies indicate that in the chloroethanol solution of nylon 6 and calcium chloride, complex bonds between calcium cation and oxygen atom of carbonyl group gradually form, and calcium cations are inserted into the molecular chains of nylon 6, which weaken the hydrogen bonds between the molecular chains of nylon 6 and damage the three-dimensional ordered structure of nylon 6, so the crystallinity of nylon 6 decreases and nylon 6 changes from crystalline to amorphous phase.