摘要
在减压蒸馏的多相体系条件下对微晶纤维素进行醋酸酯化改性,制得一种新型的高取代度高结晶度的醋酸纤维素酯,其取代度为 1. 85,结晶度为 67%。利用FT-IR、X射线和TGA对其进行了表征。结果表明:与在以往体系下制得的高取代度的醋酸纤维素酯相比,这种新型的醋酸纤维素酯不但具有很高的结晶度,而且基本维持了纤维素Ⅰ的晶形,且其热稳定性也有很大提高。
The new cellulose acetate of high degrees of substitution and crystallinity was prepared by acetylation of microcrystalline cellulose(MCC) in the heterogeneous system through distillation under reduced pressure.The degrees of substitution and crystallinity of the cellulose were 1.85 and 67%,respectively.The characteristics of this cellulose acetate was analyzed by FT-IR,X-ray and TGA.The results show:of high degree of substitution,the cellulose acetate prepared in heterogeneous system not only has much higher crystallinity than those prepared in quasi-homogeneous system,but also keeps the crystal form of cellulose I and has high thermal stability.
出处
《林产化学与工业》
EI
CAS
CSCD
2005年第1期49-52,共4页
Chemistry and Industry of Forest Products
关键词
高结晶度
高取代度
醋酸纤维素酯
high crystallinity
high degree of substitution
cellulose acetate
