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- 2016
锂皂石质量分数对LiCl/PA6络合体系结构与性能的影响
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Abstract:
采用熔融挤出的方法制备了锂皂石/LiCl/尼龙6（PA6）复合材料，研究了锂皂石质量分数对LiCl/PA6复合材料结构与性能的影响，同时探讨了络合反应对锂皂石在基体中分散的影响。DSC和XRD研究发现：锂皂石的加入有利于复合材料结晶，但锂皂石/LiCl/PA6复合材料的结晶度都比LiCl/PA6复合材料的结晶度低，在锂皂石质量分数为5%时，锂皂石/LiCl/PA6复合材料的结晶度最大，且此时复合材料的拉伸强度和弯曲强度也达最大值，分别为99.17 MPa和154.17 MPa。由TEM观察到当锂皂石质量分数为5%时，锂皂石主要以插层方式均匀分布在基体中，部分呈现剥离的状态。此外，动态流变Han曲线表明：锂皂石/LiCl/PA6复合材料的黏性响应占主导地位。当锂皂石质量分数高于5%时，由于锂皂石团聚，无机相和有机相具有不同的松弛状态，导致共混物熔体的Cole-Cole曲线出现严重拖尾现象。将锂皂石加入LiCl/PA6复合材料既保持了低熔点的特性又表现出优异的力学性能，因此锂皂石起到了明显的增强作用。 Hectorite/LiCl/nylon 6(PA6) composites were prepared through melting extrusion process, the effects of mass fraction of hectorite on structure and properties of LiCl/PA6 composites were studied. The effect of complexation reaction on the dispersion of hectorite in the matrix was also discussed. DSC and XRD research indicate that addition of hectorite is advantageous to the crystal of composites, but the crystallinity is less than that of LiCl/PA6 composites. When the mass fraction of hectorite is 5%, the crystallinity of hectorite/LiCl/PA6 composites is the largest. Meanwhile, the tensile strength and bending strength of the composites reach the maximum values of 99.17 MPa and 154.17 MPa, respectively. TEM shows that when the mass fraction of hectorite is 5%, the dispersion of hectorite in the matrix was mainly intercalated dispersion and partly exfoliated morphology. In addition, dynamic Han curves show that the viscous response dominates in hectorite/LiCl/PA6 composites. As the agglomeration of hectorite and different relaxation state of different phases for inorganic clay and organic phase, Cole-Cole curves display a phenomenon of severe smearing when the mass fraction of hectorite is greater than 5%. Hectorite/LiCl/PA6 composites not only keep the characteristics of the low melting point and show excellent mechanical properties. Hence, hectorite shows obvious enhancement effect. 国家自然科学基金（51563002）；贵州省优秀青年科技人才培养对象专项资金（黔科合人字[2013]33号）；贵州省教育厅研究生卓越人才计划（黔教研ZYRC字[2013]006号）；贵州大学研究生创新基金（研理工2015001）
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