微晶纤维素的表面改性对己内酰胺聚合的复合材料性能的影响*

摘要

Microcrystalline cellulose was modified by 2,4-disocyanatotoluene (TDI).The MCC/PA6 composites and TMCC/PA6 composites were prepared via in-situ polymerization of caprolactam(CL)after dispersion MCC and modified-MCC (TMCC)in caprolactam,and the effect of MCC modified on MCC/PA6 composites was in-vestigated.The results showed that the conversion rate of CL in TMCC/PA6 composites was higher than that in MCC/PA6 composites.Compared with pure PA6,the molecular weight of PA6 in TMCC/PA6 composites was higher than that in MCC/PA6 composites.The shear viscosity of the composites and pure PA6 were tested at 250 ℃,and the results presented that the shear viscosities of composites were higher than those of pure PA6, and the shear viscosity of MCC/PA6 composites was the highest.%利用2,4-甲苯异氰酸酯(TDI)对微晶纤维素(MCC)进行改性,将改性前后的纤维素(MCC 和TMCC)分散到己内酰胺(CL)中并利用 CL 阴离子开环聚合制备得到 MCC/PA6和 TMCC/PA6复合材料,研究 TDI 对 MCC 表面改性对复合材料的影响。扫描电子显微镜和傅立叶红外光谱结果表明 TDI 和MCC 表面发生了接枝反应。比较复合材料中 CL 的转化率,发现 TMCC/PA6复合材料中 CL 的转化率比MCC/PA6复合材料中 CL 的转化率高；测试复合材料中 PA6和纯 PA6的分子量,结果表明 TMCC/PA6复合材料中 PA6的分子量明显高于 MCC/PA6复合材料中 PA6的分子量；测试 MCC、TMCC 含量为1％(质量分数)的复合材料与纯 PA6在250℃的剪切粘度,发现复合材料在250℃下剪切粘度在低频下均比 PA6高,且前者最高,高频时两者趋向一致。