Preparation and Properties of Coextruded PVC Foamed Wood Plastic-Laminated Veneer Lumber Composites

CHEN Yuan; CHEN Lei; XING Zhidong; WANG Xiaoyu; HAO Xiaolong

doi:10.12326/j.2096-9694.2025073

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Preparation and Properties of Coextruded PVC Foamed Wood Plastic-Laminated Veneer Lumber 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 Future Biomass，South China Agricultural University，Guangzhou 510642，Guangdong，China
3.College of Arts，South China Agricultural University，Guangzhou 510642，Guangdong，China
Vol. 39, Issue 6, Pages: 53-61(2025)
DOI： 10.12326/j.2096-9694.2025073
稿件说明：

移动端阅览

陈园,陈磊,邢志栋等.PVC发泡木塑-单板层积材共挤复合材料的制备与性能研究[J].木材科学与技术,2025,39(06):53-61. DOI： 10.12326/j.2096-9694.2025073.

CHEN Yuan,CHEN Lei,XING Zhidong,et al.Preparation and Properties of Coextruded PVC Foamed Wood Plastic-Laminated Veneer Lumber Composites[J].Chinese Journal of Wood Science and Technology,2025,39(06):53-61. DOI： 10.12326/j.2096-9694.2025073.

摘要

木塑复合材料因密度大、易蠕变等特点严重限制其在工程结构领域的应用。为解决上述问题，研究以耐水防潮的稻壳/聚氯乙烯发泡复合材料（rice

husk-polyvinyl chloride foamed composites，RHPC）（简称为PVC发泡木塑）为表层，单板层积材（laminated veneer lumber，LVL）为芯层，通过自主搭建设计的多元共挤装置制备PVC发泡木塑-LVL共挤复合材料（RHPC-LVL composites，RHPC-LVL）。结果显示，RHPC-LVL的密度约为0.6 g/cm

，弯曲强度和弯曲模量分别为102.6 MPa与11.4 GPa，介于RHPC和LVL之间；比弯曲强度与比弯曲模量较表层RHPC分别提高了38.1%和96.7%。相较于未封端处理的样品，经封端处理后的RHPC-LVL耐老化性能大幅提升，6次加速老化后弯曲强度和弯曲模量的保留率分别为63.5%和38.6%。当施加载荷增至30%极限强度时，RHPC-LVL的800 h蠕变应变较LVL提高16.5%，RHPC在30 ℃和60 ℃短期蠕变应变较LVL分别提高33%和200%；通过采用典型的蠕变模型对蠕变阶段和恢复阶段分别进行拟合，为RHPC-LVL在工程领域应用中的蠕变预测提供理论基础。本研究为RHPC-LVL的开发和应用提供指导。

Abstract

Traditional wood plastic composites (WPC) are extremely limited in engineering structural applications due to their high density and susceptibility to creep behavior. To address these issues

this study developed a composite using a water-resistant

moisture-proof rice husk-polyvinyl chloride foamed composite (RHPC) as the surface layer and laminated veneer lumber (LVL) as the core layer

via a custom-designed co-extrusion device. The resulting RHPC-LVL composites (RHPC-LVL) exhibited a density of approximately 0.6 g/cm³

with a flexural strength of 102.6 MPa and a flexural modulus of 11.4 GPa

falling between those of RHPC and LVL. Compared to the surface RHPC

the specific flexural strength and specific flexural modulus of RHPC-LVL increased by 38.1% and 96.7%

respectively. After end-capping treatment

the aging resistance of RHPC-LVL was significantly improved

with flexural strength and flexural modulus being 63.5% and 38.6% of the control specimens after six accelerated aging cycles.When the applied load increased to 30% of the ultimate strength

the 800-hour creep strain of RHPC-LVL increased by 16.5% compared to LVL. The short-term creep strain of RHPC at 30 °C and 60 °C increased by 33% and 200% compared to LVL

respectively. By fitting the creep and recovery stages using commonly used creep models

this study provided a theoretical basis for predicting the short-term creep of RHPC-LVL in engineering structural applications. This research could offer guidance for the development and application of RHPC-LVL.

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