碳酸钙填充高密度聚乙烯复合材料冲击断口形貌的研究

STUDY ON IMPACT PROPERTIES AND FRACTURE MORPHOLOGY OF CaCO_3 FILLED HDPE

用扫描电镜观察了碳酸钙（ＣａＣＯ３）／高密度聚乙烯（ＨＤＰＥ）复合材料的冲击断口形貌．发现以１２５０目轻质ＣａＣＯ３填充的ＨＤＰＥ，其断口形貌一般呈带状结构；以１２５０目重质ＣａＣＯ３或３２５目轻质ＣａＣＯ３填充的ＨＤＰＥ，其断口形貌一般呈絮状结构．带状的成因是包覆的ＣａＣＯ３粒子具有几乎各向同性地向四周传递应力的能力，满意地解释了带状的平行方向可以与宏观受力方向平行、垂直或成某种夹角，但总是与微观的某一基体屈服、变形的方向垂直．带状与絮状结构是断口形貌的两种形式。

The effect of the content of 'W-893' coupling agent and that of particle size, type and content of CaCOe on the impact strengh of HDPE compound were discussed. HDPE compouned filled with 50 PHR CaCOe has the impact strength of 542.35 J /m, which is 3.7 times that of HDPE matrix. An investigation of impact fracture morphology of HDPE compound has ben undertaken by SEM(scanning electron microscope) which showed that impact fracture surface of L-1250 CaCO3 that of both L-325 CaCO3 and W- 1250 CaCO3 filled HDPE compound exhibit flocculence structure. In banded structure, the direction of alligament band is always vertical to that of deformation and yield of HDPE whether it is parallel to the loaded force or not.