湿法接枝改性淀粉在EVA鞋底发泡材料中应用的初步探讨

The preliminary research on EVA sole foaming materials with wet grafted starch

通过对可溶性淀粉湿法接枝VAc(醋酸乙烯酯)制备改性淀粉,并将改性淀粉用于EVA鞋底发泡材料中以制备环境友好型复合发泡材料。利用FT-IR、接枝率和接枝效率研究淀粉的接枝改性效果,通过SEM和物理力学性能的测定研究鞋底发泡材料的结构与性能。红外光谱中在1746cm-1处出现的CO伸缩振动峰表明醋酸乙烯酯单体可能已经接枝到淀粉大分子链上。淀粉湿法接枝改性的最佳引发剂浓度为7mmol/L,最佳反应温度为70℃。SEM分析表明改性淀粉与EVA具有较好的相容性。湿法接枝改性淀粉/EVA鞋底发泡材料的密度低于传统EVA鞋底发泡材料的密度,当改性淀粉含量为40份时,密度最小为0.085g/cm3。

The modified starch was prepared through the soluble starch wet graft vinyl acetate and the environmental friendly EVA sole foaming materials were obtained with the modified starch.The effect and structure of the modified starch was analyzed by FT-IR,grafting ratio and grafting efficiency,while the mechanical properties and microscopic morphology of the modified starch/EVA sole foaming materials were also investigated.According to the results,the FT-IR spectrum of the modified starch showed a adsorption peak at 1746cm-1,which was assigned to the stretching vibration of the carbonyl group and indicated that the monomer of vinyl acetate might graft onto the bone of the starch.The best initiator concentration was 7mmol/L and the optimum reaction temperature was 70℃.The SEM pictures demonstrated that the modified starch and EVA had good compatibility.The proportion of wet grafted starch/EVA sole foaming materials were lower than traditional EVA sole foaming materials,when the content of the grafted starch was 40phr,the proportion of the composite foaming materials reached the minimum,which was 0.085g/cm3.