轻质空心木质复合材料热和力学性能分析

将PVC空心塑料管嵌入至木质纤维板坯中，通过热压法制备轻质木质复合材料（HWC），分析了PVC管空气体积比对HWC的力学性能和热性能的影响，并对热性能进行仿真分析。结果表明，通过嵌入PVC空心塑料管，可以制备密度0.3 g/cm³的轻质木质复合材料，HWC断面密度呈双“M”型分布，表层密度最小。随着PVC管内空气体积比的增加，HWC静曲强度、弯曲弹性模量有增大的趋势，内结合强度减小，对24 h吸水厚度膨胀率和吸水率影响较小。PVC管内空气体积比对HWC的导热系数影响较小，且均<0.07 W/(m·K),并可通过合并Series模型和Parallel模型进行预测。PVC空心塑料管的嵌入阻碍了木质复合材料的热量传递，热传递测试降温1 h后HWC表面温度平均比对照组高0.93℃。

Thermal and Mechanical Property Analysis of Light-Weight Hollow Wood Composites

Light-weight hollow wood composites (HWC) were manufactured by embedding PVC plastic tubes to fiberboard with hot-press.The influences of tube air volume ratio on thermal and mechanical properties of HWC were investigated and thermal simulation analysis was carried out.The results indicated that HWC with density of 0.3 g/cm³ could be successfully prepared by embedding PVC tubes.HWC vertical density profile curve was in “M” shape distribution while surface density was minimum.With the increase of tube air volume ratio,water absorption performance of HWC had no significant impact,modulus of rupture and modulus of elasticity tended to increase but bonding strength reduced.Thermal conductivity of all HWC was less than 0.07 W/(m·K) and could be forecasted by combining series model and parallel model.Hollow structure had obvious effect on inhibiting heat transfer,which led to a lower heat transfer rate of HWC than control group.Surface temperature was 0.93℃ higher than control group after cooling 1 h of heat transfer test.