利用直接共混法和包覆法两种方法制备了聚丙烯／天然橡胶／超细碳酸钙三元复合材料，研究了弹性体及碳酸钙的质量分数对聚丙烯力学性能和加工流变行为的影响．力学实验结果表明同等质量分数下天然橡胶对聚丙烯力学强度的降低程度要小于三元乙丙橡胶．而碳酸钙的最佳质量分数为25％，此时聚丙烯／天然橡胶／碳酸钙三元复合体系具有最高的拉伸强度和冲击强度，复合体系的弯曲模量相对于聚丙烯／天然橡胶二元体系提高了57．1％．另外，直接共混物法和包覆法对聚丙烯力学性能的影响呈现不同的趋势，天然橡胶与碳酸钙直接共混法对聚丙烯力学强度的保持效果要优于包覆法，而采用天然橡胶包覆碳酸钙的方法对聚丙烯的增韧效果要优于直接共混法．最后哈克转矩流变测试表明天然橡胶及碳酸钙的加入可以降低聚丙烯的平衡扭矩．%Polypropylene/natural rubber/calcium carbonate ternary composites were prepared by one‐pot and encapsulation methods .T he effect of elastomer and calcium carbonate on the mechanical and rheo‐logical properties of ploypropylene w as investigated .T he mechanical results revealed that the decrease of mechanical strength of ploypropylene caused by natural rubber is lower than that of ethylene‐propyl‐ene‐diene rubber .The optimum weight fraction of calcium carbonate content is 25% for ploypropylene/natural rubber/calcium carbonate ternary composites ,the tensile strength and impact strength of terna‐ry composites are highest and the flexural modulus of ploypropylene/natural rubber blends is increased by 57 .1% w hen the calcium carbonate content is 25% .In addition ,the effect of one‐pot and encapsula‐tion methods on the mechanical properties of ploypropylene is different . The tensile strength of ploypropylene/natural rubber/calcium carbonate fabricated by one‐pot method is higher compared with encapsulation method ,w hile encapsulation method has better toughening effect than that of one‐pot method .Finally ,the Haake torque rheological measurement indicated the incorporation of nature rub‐ber and calcium carbonate can decrease the equilibrium torque of ploypropylene .
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