单板层积材-木粉/高密度聚乙烯共挤出复合材料抗低速冲击性能

Low-velocity impact performance of laminated veneer lumber-wood/high density polyethylene co-extruded composites

通过共挤出技术制备具有核壳结构的共挤出复合材料,其中壳层为木粉/高密度聚乙烯(W/HDPE),核层为杨木单板层积材(LVL),测试了LVL-W/HDPE和LVL在50J、75J及100J能量下的低速冲击性能,并进一步研究水煮-冰冻-干燥环境处理后两者的低速冲击性能。结果表明,与LVL相比,在50J能量冲击过程中LVL-W/HDPE的吸收能量和损伤深度分别降低2.9%和15.9%;在75J能量冲击过程中LVL-W/HDPE的吸收能量和损伤深度分别降低3.9%和9.2%;而在100J能量冲击下,两者的抗冲击性能基本相同;经水煮-冰冻-干燥环境处理后,由于壳层WPC的保护作用,LVL-W/HDPE不仅保持了良好的抗冲击性能,还表现出了优异的耐环境性能。

The core-shell structure composites were prepared by co-extrusion technology with the wood/high density polyethylene（W/HDPE）as shell layer and the poplar laminated veneer lumber（LVL）as core layer.Both of the LVL-W/HDPE and LVL were treated with boiled-frozen-dry environment at one cycle,and the low velocity impact property was investigated at three different impact energies of 50 J,75 Jand 100 J.The results indicate that the absorption energy and damage depth of LVL-W/HDPE was decrease by 2.9% and 15.9%,respectively,compared with LVL at the impact energy of 50 J.And the decreasing magnitude of the absorption energy and damage depth are about 3.9% and 9.2% at 75 J.While the results are almost the same at 100 J.The treated results also prove that the LVL-W/HDPE has better environmental resistance as well as impact property because of the presence of the protection shell layer.