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通过熔融共混法制备了一系列蛭石填充尼龙66复合材料,测试了复合材料的力学性能,用SEM、DSC、WAXD和HAAKE-Ⅱ高压毛细管流变仪等方法研究了复合材料的微观结构、非等温结晶过程和结构、流变性能。结果表明:蛭石的加入提高了尼龙66的拉伸性能和弯曲性能。随蛭石填充量的增加,尼龙66复合材料的拉伸强度变化不大,均提高了约12%;弹性模量、弯曲强度和弯曲模量基本呈线性上升趋势,当填充量为26%时,分别提高了116%、32%、55%;当填充量小于16%时,冲击强度降低不多,但填充量大于16%时,冲击强度降低较多;蛭石对尼龙66具有有效的异相成核的作用。与纯尼龙66相比,蛭石填充复合材料的结晶温度升高,过冷度降低,结晶峰半高宽减小,半结晶周期减小;蛭石在尼龙66基体中分散较均匀,部分蛭石粒径在纳米级,蛭石与尼龙66树脂之间有较好的粘结作用;蛭石的加入使尼龙66非牛顿指数减小,尼龙66对剪切力敏感性下降。
A series of vermiculite filled nylon 66 composites were prepared by melt blending method. The mechanical properties of the composites were tested. The microstructure of the composites was investigated by SEM, DSC, WAXD and HAAKE-Ⅱ high pressure capillary rheometer. Non-isothermal crystallization process and structure, rheological properties. The results show that the addition of vermiculite improves the tensile and flexural properties of nylon 66. With the increase of vermiculite loading, the tensile strength of nylon 66 composites did not change much, both increased by about 12%. The elastic modulus, flexural strength and flexural modulus tended to increase linearly with the loading of 26% , Respectively, increased by 116%, 32% and 55% respectively. When the loading was less than 16%, the impact strength was not reduced much. However, the impact strength decreased more when the loading was more than 16% The role of nuclear phase. Compared with pure nylon 66, the temperature of the vermiculite filled composites increases, the degree of undercooling decreases, the FWHM decreases and the semi-crystallization period decreases. Vermiculite disperses more uniformly in the nylon 66 matrix. The particle size of the stone is in the nanometer scale, and the vermiculite and the nylon 66 resin have a good bonding effect. The addition of vermiculite decreases the non-Newtonian index of nylon 66 and decreases the sensitivity of the nylon 66 to the shear force.