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为了扩宽尼龙6(PA6)的工程应用领域,首先,通过熔融挤出制备了LiCl/PA6复合材料;然后,利用XRD、DSC、流变仪及电子拉伸试验机等研究了LiCl含量对PA6结晶行为和力学性能的影响及结晶的受限机制。结果表明:随LiCl含量的增加,LiCl/PA6复合体系的成核温度、晶体生长温度及熔融温度均向低温方向移动;成核密度和速率均逐渐减小,导致结晶能力下降,结晶度由原来的36.5%降低为5.6%;γ晶结晶度逐渐降低,而α晶结晶度先增大后减小,γ晶与α晶发生转变。此外,LiCl/PA6复合材料的拉伸强度和冲击强度均先增大后减小;当LiCl含量为6.0wt%时,冲击强度达到最大值7.9kJ/m2,是纯PA6的冲击强度(5.5J/m2)的1.44倍。
In order to broaden the engineering applications of PA6, firstly, LiCl / PA6 composites were prepared by melt extrusion. Then, the effects of LiCl content on the mechanical properties of PA6 were studied by XRD, DSC, rheometer and electronic tensile tester. Effect of Crystallization Behavior and Mechanical Properties and Limitation Mechanism of Crystallization. The results show that with the increase of LiCl content, the nucleation temperature, crystal growth temperature and melting temperature of LiCl / PA6 composite system all move toward low temperature. The nucleation density and rate decrease gradually, which leads to the decrease of crystallization ability. Of 36.5% to 5.6%. The crystallinity of γ crystallinity decreased gradually, while the crystallinity of α crystal increased first and then decreased, and the γ crystal and α crystal changed. In addition, the tensile strength and impact strength of LiCl / PA6 composites both increase and then decrease; when the content of LiCl is 6.0wt%, the impact strength reaches the maximum of 7.9kJ / m2, which is the impact strength of pure PA6 (5.5J / m2) of 1.44 times.