Preparation and Mechanical Properties of Thermally Reversible Covalent Crosslinked Wood-Plastic Composites

ZHAO Nianhan; HAO Xiaolong; YANG Weijun; OU Rongxian; WANG Qingwen

doi:10.12326/j.2096-9694.2023051

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Preparation and Mechanical Properties of Thermally Reversible Covalent Crosslinked Wood-Plastic Composites
1.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
2.Key Laboratory for Biobased Materials and Energy of Ministry of Education，College of Materials and Energy， South China Agricultural University，Guangzhou 510642，Guangdong，China
3.The Key Laboratory of Synthetic and Biological Colloids，Ministry of Education，Jiangnan University，Wuxi 214122，Jiangsu，China
Vol. 37, Issue 4, Pages: 44-50(2023)
DOI： 10.12326/j.2096-9694.2023051

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赵念晗,郝笑龙,杨伟军等.热可逆性共价交联木塑复合材料的制备及力学性能[J].木材科学与技术,2023,37(04):44-50.

ZHAO Nianhan,HAO Xiaolong,YANG Weijun,et al.Preparation and Mechanical Properties of Thermally Reversible Covalent Crosslinked Wood-Plastic Composites[J].Chinese Journal of Wood Science and Technology,2023,37(04):44-50.
赵念晗,郝笑龙,杨伟军等.热可逆性共价交联木塑复合材料的制备及力学性能[J].木材科学与技术,2023,37(04):44-50. DOI： 10.12326/j.2096-9694.2023051.

ZHAO Nianhan,HAO Xiaolong,YANG Weijun,et al.Preparation and Mechanical Properties of Thermally Reversible Covalent Crosslinked Wood-Plastic Composites[J].Chinese Journal of Wood Science and Technology,2023,37(04):44-50. DOI： 10.12326/j.2096-9694.2023051.

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。

Abstract

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.

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

Keywords

thermally reversible covalent crosslinked wood-plastic composites (TRC-WPCs)epoxy vitrimerreversible covalent bondingcyclic reprocessinghot-pressing processmechanical properties

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