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用原位分散聚合法制备了一系列Gd2O3/MC尼龙纳米复合材料,用SEM观察了Gd2O3纳米粒子在MC尼龙基体中的分散情况,用XRD研究了复合材料的晶体结构,并对复合材料的力学性能进行了表征。研究结果表明:(1)用原位分散聚合法制备Gd2O3//MC尼龙纳米复合材料是可行的,Gd2O3纳米粒子均匀分散在MC尼龙基体中,团聚情况较少;(2)Gd2O3纳米粒子没有改变MC尼龙的结晶形态,但使其晶格尺寸发生了一定程度的改变;(3)纳米Gd2O3的加入可明显改善MC尼龙的力学性能,对MC尼龙同时具有增强和增韧双重效果。随着纳米Gd2O3用量的增加,复合材料的拉伸强度、断裂伸长率、缺口冲击强度、弯曲强度和弯曲模量都呈先升后降的趋势。当纳米Gd2O3用量为0.5%时,复合材料的综合性能最好,其拉伸强度、断裂伸长率、缺口冲击强度、弯曲强度和弯曲模量分别比MC尼龙基体提高19.6%、47.2%、19.7%、9.3%%和11.7%。
A series of Gd2O3 / MC nylon nanocomposites were prepared by in situ dispersion polymerization. The dispersion of Gd2O3 nanoparticles in MC nylon matrix was observed by SEM. The crystal structure of the composite was investigated by XRD. The mechanical properties of the composites Performance was characterized. The results show that: (1) Gd2O3 // MC nylon nanocomposites prepared by in-situ dispersion polymerization is feasible. Gd2O3 nanoparticles are uniformly dispersed in MC nylon matrix with few agglomeration; (2) Gd2O3 nanoparticles have not changed MC nylon crystal morphology, but the lattice size of a certain degree of change; (3) The addition of nano-Gd2O3 can significantly improve the mechanical properties of MC nylon, MC nylon also has the dual effect of strengthening and toughening. With the increase of the amount of nano-Gd2O3, the tensile strength, elongation at break, notched impact strength, flexural strength and flexural modulus all increased first and then decreased. When the amount of nano-Gd2O3 is 0.5%, the composite has the best comprehensive properties, and the tensile strength, elongation at break, notched impact strength, flexural strength and flexural modulus are respectively 19.6%, 47.2% and 19.7 %, 9.3 %% and 11.7%.