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通过熔融共混法制备了不同KCl含量下的尼龙6(PA6)/KCl复合材料,采用示差扫描量热仪(DSC)、流变仪、红外光谱(IR)、电子拉伸机等研究了KCl含量对PA6/KCl复合材料结晶行为、流变性能及力学性能的影响,并研究了其受限机制.力学性能研究结果表明,随着KCl含量的增加,PA6/KCl复合材料拉伸强度和冲击强度呈现出先增大后减小的趋势,在KCl含量为3 phr时,复合材料拉伸强度和冲击强度分别达到最大值82.67 MPa和7.34 k J/m~2,较纯PA6分别增加了10.8%和34.68%,动态力学性能测量结果表明,在测量温度范围内,复合材料的储能模量均高于纯PA6,在25℃体系储能模量(G’)随KCl含量的增加而增大,复合体系抵抗弯曲变形能力增加,而结晶行为研究结果表明,增加KCl的含量,PA6/KCl复合材料的成核温度、晶体生长温度、熔融温度及玻璃化转变温度均向低温方向移动,成核密度和成核速率也逐渐减小,结晶能力下降,结晶度减小,结晶度由原来25.30%变为19.34%,而结晶诱导时间逐渐增加.流变性能研究结果表明,随着KCl含量的增加,复合体系的零剪切黏度逐渐增加,且所有的体系均呈现出假塑性流体行为,剪切变稀现象越来越明显,特征松弛时间τ_1、τ_2和τ_3逐渐增加,复合体系的松弛机制发生变化.
Nylon 6 (PA6) / KCl composites with different contents of KCl were prepared by melt blending method. The effects of KCl KCl composites.The results show that with the increase of KCl content, the tensile strength and impact of PA6 / KCl composite The tensile strength and impact strength of the composites reached 82.67 MPa and 7.34 kJ / m ~ 2 respectively at KCl content of 3 phr, which increased by 10.8% And 34.68% respectively. The results of dynamic mechanical properties show that the storage modulus of the composites is higher than that of pure PA6 in the measurement temperature range, and the storage modulus (G ’) increases with the increase of KCl content at 25 ℃ , And the composite system has an increased resistance to bending deformation. The results of crystallization behavior show that the nucleation temperature, crystal growth temperature, melting temperature and glass transition temperature of PA6 / KCl composite move to the low temperature with the increase of KCl content. The nucleation Density and nucleation rate are also gradually reduced, knot The crystallinity decreased from 25.30% to 19.34%, while the crystallization induction time gradually increased.The results of rheological properties showed that with the increase of KCl content, the zero-shear viscosity of the composite system increased gradually, All systems exhibited pseudoplastic fluid behavior. The phenomenon of shear thinning became more and more obvious. The relaxation time of characteristic τ_1, τ_2 and τ_3 gradually increased, and the relaxation mechanism of the composite system changed.