木材科学与技术2025，Vol.39Issue(6)：53-61,9.DOI:10.12326/j.2096-9694.2025073
PVC发泡木塑-单板层积材共挤复合材料的制备与性能研究
Preparation and Properties of Coextruded PVC Foamed Wood Plastic-Laminated Veneer Lumber Composites
摘要
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 ℃ and 60 ℃ 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.关键词
木塑复合材料/共挤/力学性能/蠕变/老化Key words
wood plastic composites/coextrusion/mechanical properties/creep/aging分类
轻工纺织引用本文复制引用
陈园,陈磊,邢志栋,王小玉,郝笑龙..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(6):53-61,9.基金项目
国家自然科学基金面上项目"超高木质纤维含量木塑复合材料动态界面流变机理"(32471786) （32471786）
广东省自然科学基金青年提升项目"超高生物质纤维含量木塑复合材料创制及复合原理"(2024A1515030040). （2024A1515030040）
