文献类型：期刊文献

英文题名：Enhancing Crystallization and Toughness of Wood Flour/Polypropylene Composites via Matrix Crystalline Modification: A Comparative Study of Two beta-Nucleating Agents

作者：Luo, Shupin[1] Lv, Chao[1] Chang, Liang[1] Guo, Wenjing[1]

第一作者：罗书品

通信作者：Chang, L[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, 2 Dongxiaofu, Beijing 100091, Peoples R China

年份：2022

卷号：14

期号：17

外文期刊名：POLYMERS

收录：;EI(收录号：20223812748890);Scopus(收录号：2-s2.0-85137826822);WOS:【SCI-EXPANDED(收录号:WOS:000851815600001)】；

基金：This research was funded by National Natural Science Foundation of China, grant number 31901250.

语种：英文

外文关键词：wood filler; polypropylene; composite; nucleating agent; beta-nucleation; crystallization behavior; mechanical properties

摘要：Incorporation of short wood fillers such as wood flour (WF) into polypropylene (PP) often results in a marked reduction of toughness, which is one of the main shortcomings for WF/PP composites. This research reports a facile approach to achieve toughening of WF/PP composites via introducing self-assembling beta-nucleating agents into PP matrix. The effect of two kinds of nucleating agents, an aryl amide derivative (TMB5) and a rare earth complex (WBG II), at varying concentrations on the crystallization and mechanical properties of WF/PP composites was comparatively investigated. The results showed that both nucleating agents were highly effective in inducing beta-crystal for WF/PP, with beta-crystal content (k(beta)) value reaching 0.8 at 0.05 wt% nucleating agent concentration. The incorporation of TMB or WBG significantly decreased the spherulite size, increased the crystallization temperature and accelerated the crystallization process of WF/PP. As a result of PP crystalline modification, the toughness of composites was significantly improved. Through introducing 0.3 wt% TMB or WBG, the notched impact strength and strain at break of WF/PP increased by approximately 28% and 40%, respectively. Comparatively, although WF/PP-WBG had slightly higher K-beta value than WF/PP-TMB at the same concentration, WF/PP/TMB exhibited more uniform crystalline morphology with smaller spherulites. Furthermore, the tensile strength and modulus of WF/PP-TMB were higher than WF/PP-WBG. This matrix crystalline modification strategy provides a promising route to prepare wood filler/thermoplastic composites with improved toughness and accelerated crystallization.