Effect of a promising CSESE pretreatment on the morphological structure and properties of jute fibers

¹ Academic Affairs Office, Guangdong Ploytechnic of Science and Technology, Zhuhai, 519090, Guangdong, P. R. China ;
² Zhuhai Tianwei Pegasus Printing Supplies Co., Ltd, Zhuhai, 519060, Guangdong, P. R. China ;
³ School of materials and environment, Beijing Institute of Technology, Zhuhai, 519085, Guangdong, P. R. China ;
⁴ Green Printing Laboratory, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China ;
⁵ School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 102488, P. R. China ;
⁶ National Engineering Research Center of Novel Equipment for Polymer Processing, South China University of Technology, Guangzhou, Guangdong 510641, P. R. China;
⁷ The Key Laboratory of Polymer Processing Engineering of the Ministry of Education, South China University of Technology, Guangzhou, Guangdong 510641, P. R. China .

^* Corresponding author: 05012@bitzh.edu.cn
(Li chong: male, 1981, PhD, lecturer, research direction: high-value modification and application of biomass materials, lcly3278@126.com)

Abstract

Plant fiber has a complex aggregated structure, high crystallinity and a large number of hydrogen bonds, and has low chemical reaction activity. Therefore, in order to improve the reactivity, the plant fiber needs to be pretreated before chemical modification. Therefore, the pretreatment method has an important influence on the chemical modification of plant fibers. In this paper, Jute fibers were successively treated by particular continuous screw-extrusion steam explosion (CSESE). The effects on the morphological ructure, composition, thermal and crystalline properties of jute fibers before and after treated were investigated. Scanning electron microscopy (SEM) showed that the morphological structure changed significantly after CSESE pretreatment, the diameter was smaller, the surface cracks and the specific surface area increased. There was no new functional groups appeared in fourier transform infrared spectroscopy (FTIR). Composition analysis demonstrated that the content of hemicellulose and extractive decreased, but cellulose and lignin increased. The crystallinity of JSE increased from 66.31 % to 70.19 %. X-ray photoelectron spectroscopy (XPS) suggested that the cellulose and lignin content increased. Thermogravimetric analysis (TGA) demonstrated that the initial decomposition temperature of JSE increased from 334.4 to 355.2°C. DMA indicated that the Tg of JSE reduced from 92.6 to 90.0°C. Therefore, for jute fiber, the CSESE pretreatment is an effective and promising pretreatment method for further chemical modification, biofuels and chemical products.