Molecular Structure and Electrical Insulating Properties of Grafted and Cyanoethylated Cellulose

摘要

Cyanoethylation of cellulose and Grafting of cellulose {bleached viscose wood pulp (VWP)} & cyanoethyyl cellulose are carried out. The nitrogen content of these cellulose derivatives is deterined. Grafted cyanoethyl cellulose has the highest nitrogen content (12.5%). ET/IR spectra of these derivatives showed a new band at 2225 cm~(-1) in the spectra of cyanoethyl and grafted cellulose which is the characteristic band for -C ident to N stretching vibration. Also, a new band appared at 1720 cm~(-1) in case of grafted cyanoethyl cellulose, which is the characteristic band for C=O stretchingg vibration. The crystallinity index (A 1435/A 900 cm~(-1)) of cyanoethyl cellulose is lower than that in case of cellulose and grafted cellulose. The thermal study shows three endothermic peaks for grafted cyanoethyl celluose while as cellulose, grafted and cyanoethyl cellulose has one endothermic peaks. The dielectric properties depend on hte nitrogen content. These observations are closely correlated wit the structure of the products such as types of side groups and the interaction between them.