This paper studied the surface modification of light calcium carbonate (L-CaCO3) with titanate coupling agents by FTIR.The effects of activated L-CaCO3 on rhelogical behavior and mechanical properties of PVC composites were discussed.The results showed that the dispersi on of L-CaCO3 in PVC and the rhelogical behavior of composites were im proved by adding the coupling agent of titanate.The charpy impact stre ngth of the L-CaCO3-filled PVC composite treated with NDZ 101 was incr eased by 56%, which was demonstrated by examining the broken surface o f specimen with SEM. The relationship between the morphology and prope rties established was useful for industrial producting.%用红外光谱分析（FTIR）研究了钛酸酯偶联剂对碳酸钙填料的活化作用， 探讨活化碳酸钙对填充PVC复合材料的力学性能和流变性能的影响．结果表明：碳 酸钙经钛酸酯偶联剂处理，改善了其在复合材料中的分散性、流变性能，冲击强 度比未处理碳酸钙的冲击强度提高了56%，并用扫描电子显微镜（SEM）观察了复 合材料断面形貌，揭示形态结构与性能间的关系．
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