文献类型：会议论文

英文题名：Properties of Modified Cellulose-based Plastics Film

作者：Xu, Yuzhi[1] Li, Ling[1] Wang, Chunpeng[1] Chu, Fuxiang[2]

第一作者：许玉芝

通信作者：Xu, YZ[1]

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Nanjing 210042, Jiangsu, Peoples R China;[2]Chinese Acad Forestry, Beijing 100091, Peoples R China

会议论文集：Ist International Conference on Environmental Systems Science and Engineering (ICESSE 2011)

会议日期：AUG 06-07, 2011

会议地点：Dalian, PEOPLES R CHINA

语种：英文

外文关键词：Cellulose; degrees of substitution; Thermal behavior; crystallinity; water absorption

年份：2011

摘要：These longer chain esters (LCCEs) show promise as internally plasticized cellulose esters because the supermolecular structure of cellulose was significantly changed with the introduction of longer substituents. The internally plasticized cellulose films were obtained by casting and the influences of the DS and substitutents on the properties of these films, such as water resistance, thermal stability, glass transition temperature, tensile strength and elongation, were investigated. Contact angle of cellulose laurate films with different DS was nearly 90 degrees. TEM images and XRD diffraction patterns all showed that their crystalline state was similar. DMTA in tension mode revealed separate relaxations, denoted alpha and beta, corresponding to the glass transition and side-chain melting processes, respectively. For the three cellulose laurate samples, two main peaks separated were readily distinguished in the tans curves. The relaxation at the higher temperature (alpha ransition), which varied between 120 degrees C and 200 degrees C, was accompanied by the most important decrease of G', and this indicated that it corresponded to the glass transition of the polymer. At a lower temperature, the peak corresponded to beta transition, accompanying lateral substituent melting in the vicinity of - 30 degrees C. The films properties of long-chain cellulose esters were also compared to those of cellulose acetate, cellulose acetate propionate and cellulose acetate butyrate. The results showed that tensile strength of short-chain cellulose ester plastic films were higher than the long-chain ones with preferable failure strain level.