摘要
为提高木塑复合材料(wood-plastic composites,WPCs)的力学性能,基于酯交换反应,以木粉、E51环氧树脂和邻苯二甲酸酐为原料,通过热压成型工艺制备热可逆性共价交联木塑复合材料(TRC-WPCs),探究环氧与酸酐量比、热压工艺参数和循环加工对TRC-WPCs力学性能的影响。当环氧与酸酐的量比为1∶1,热压时间为30 min、热压温度为150°C、热压压力为12 MPa时,TRC-WPCs的力学性能最优,其拉伸强度、拉伸模量、弯曲强度和弯曲模量分别为47.3 MPa、9.3 GPa、79.2 MPa和8.9 GPa,比相同木粉含量的高密度聚乙烯基WPCs高出282%、204%、305%和245%;且循环加工后其弯曲强度和弯曲模量保持率为67.8%和84.2%,实现了TRC-WPCs的高强度化,并且高温下可循环加工。
To improve the mechanical properties of wood-plastic composites(WPCs),in this study,a thermally reversible covalent crosslinked WPCs(TRC-WPCs)was prepared based on transesterification reaction using wood flour(WF),E-51 epoxy resin,and phthalic anhydride as raw materials through the hot-pressing process.The effects of epoxy/anhydride molar ratio,hot-pressing parameters,and cyclic reprocessing on the mechanical properties of TRC-WPCs were investigated.The optimum molar ratio of epoxy to anhydride was 1∶1.The optimal hot-pressing parameters of TRC-WPCs were as follows:hot-pressing time of 30 min,temperature of 150℃,and pressure of 12 MPa.The tensile strength,tensile modulus,flexural strength,and flexural modulus of TRC-WPCs prepared with the optimal formulation and hot-pressing process were 47.3 MPa,9.3 GPa,79.2 MPa and 8.9 GPa,respectively,which were 282%,204%,305%,and 245%higher than those of the WF/HDPE(high-density polyethylene,HDPE)composites with the same WF content.The retention rate of flexural strength and modulus after cyclic reprocessing was 67.8%and 84.2%.The TRC-WPCs can be permanently crosslinked at service temperatures and efficiently plasticized at high temperatures,showing remarkable mechanical properties and reprocessability.
作者
赵念晗
郝笑龙
杨伟军
欧荣贤
王清文
ZHAO Nianhan;HAO Xiaolong;YANG Weijun;OU Rongxian;WANG Qingwen(Institute of Biomass Engineering,Key Laboratory of Energy Plants Resource and Utilization(Ministry of Agriculture and Rural Affairs),South China Agricultural University,Guangzhou 510642,Guangdong,China;Key Laboratory for Biobased Materials and Energy of Ministry of Education,College of Materials and Energy,South China Agricultural University,Guangzhou 510642,Guangdong,China;The Key Laboratory of Synthetic and Biological Colloids,Ministry of Education,Jiangnan University,Wuxi 214122,Jiangsu,China)
出处
《木材科学与技术》
北大核心
2023年第4期44-50,共7页
Chinese Journal of Wood Science and Technology
基金
国家自然科学基金“基于热可逆共价化学的木塑复合材料蠕变与热变形调控”(32071698)
广东省重点领域研发计划项目“再生低碳生态建筑材料研究与部品开发”(2020B0202010008)。
关键词
热可逆性共价交联木塑复合材料
环氧类玻璃高分子
可逆共价键
循环加工
热压工艺
力学性能
thermally reversible covalent crosslinked wood-plastic composites(TRC-WPCs)
epoxy vitrimer
reversible covalent bonding
cyclic reprocessing
hot-pressing process
mechanical properties
