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Single-step extraction of functionalized cellulose nanocrystal and polyvinyl chloride from industrial wallpaper wastes

Sun, Bin, Yu, Hou-Yong, Zhou, Ying, Huang, Zhichao, Yao, Ju-Ming
Industrial crops and products 2016 v.89 pp. 66-77
acid hydrolysis, cellulose, crystal structure, home furnishings, hydrochloric acid, nanocrystals, peeling, poly(vinyl chloride), polylactic acid, recycling, temperature, wastes
An efficient route for extracting cellulose nanocrystals (CNCs) and recycling polyvinyl chloride (PVC) is presented through formic/hydrochloric acid hydrolysis of industrial wallpaper wastes (WS). The preparation parameters were optimized by using Box–Behnken design and Multiple-response surface methodology with desirability function. An optimum yield (54.0%) and aspect ratio (12.4) were achieved at reaction time of 10h, liquid-solid ratio of 60mL/g, and temperature of 80°C. With the increasing reaction time, a gradual reduction in the size of the CNCs with rod-like and spherical shapes was found, which was explained by proposed mechanism-“progressively peeling reaction”. Moreover, compared to WS, the crystallinity and maximum degradation temperature of the CNC-10H increased to 89.8% and 371.4°C, respectively. Furthermore, the CNC-10H showed stronger nucleating effect and reinforcing capability on polylactic acid than CNC-nanosphere and CNC-nanorod. In addition, PVC layers can be completely recycled, and further used to produce new wallpapers.