研究了不同粒径木纤维(120 mesh～80 mesh、80 mesh～40 mesh、40 mesh～20 mesh、20 mesh～10 mesh)增强的高密度聚乙烯基复合材料的抗紫外加速老化性能.研究表明,含较大粒径木纤维的木塑复合材料抗弯曲性能最好,但冲击强度最差.经过2000 h的紫外加速老化后,复合材料的抗弯强度和弹性模量损失最大分别可达18％和34％,但抗冲击性能有所增强,其中20 mesh～10 mesh木纤维复合材料的冲击强度变为最大值.扫描电子显微镜观察到纤维粒径大的复合材料老化后破坏较严重,傅里叶变换红外光谱分析认为表面有氧化发生,但凝露时水分冲刷影响了表面氧化探测的准确性.
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