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通过共挤出技术制备具有核壳结构的共挤出复合材料(CTC),其中壳层为木粉/高密度聚乙烯基木塑复合材料(WPC),核层为杨木单板层积材(LVL),测试了CTC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CTC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CTC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,CTC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。
A coextruded composite (CTC) with a core-shell structure was prepared by coextrusion technique, in which the shell was wood flour / high density polyethylene wood-plastic composites (WPC), and the core layer was poplar veneer lumber (LVL). The low-speed impact properties of CTC and LVL at 50J, 75J and 100J energy were tested, and the low-speed impact properties of both the CTC and LVL after boiled-frozen-dry environment treatment were further studied. The results showed that the energy absorption and damage depth of CTC decreased by 2.9% and 15.9%, respectively, compared with that of LVL. The energy absorption and damage depth of CTC decreased by 3.9% and 9.2%, respectively, during 75J energy shock. At 100J energy impact, the impact resistance of the two is basically the same. After the treatment of boiled-frozen-dry environment, CTC not only maintains good impact resistance but also shows excellent performance due to the protection of shell WPC Environmental resistance.