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通过熔融共混挤出的方式,采用氯化锂(LiCl)对聚乙烯醇(PVA)进行改性,制备了PVA/LiCl复合材料,并运用傅里叶红外光谱法、差示扫描量热法和X射线衍射法等分析方法,研究了不同含量的LiCl对PVA的结晶行为和力学性能的影响。结果表明:LiCl中的Li+与PVA中的羟基产生络合作用,破坏了PVA中原有的氢键,降低了PVA分子链排列的规整性。随着LiCl含量的增加,复合材料的熔点、拉伸强度降低,断裂伸长率略微上升。
Polyvinyl alcohol (PVA) was modified by LiCl to prepare PVA / LiCl composite by means of melt blending and extrusion. The properties of the composite were characterized by Fourier transform infrared spectroscopy, differential scanning calorimetry X-ray diffraction and other analytical methods to study the different content of LiCl on the crystallization behavior and mechanical properties of PVA. The results showed that Li + in LiCl complexed with the hydroxyl groups in PVA, destroyed the original hydrogen bonds in PVA and decreased the regularity of PVA molecular chains. With the increase of LiCl content, the melting point and tensile strength of the composites decreased and the elongation at break increased slightly.