研究了化学竹浆纤维增强不饱和聚酯复合材料在紫外加速老化与湿热老化后力学性能变化与尺寸稳定性.结果表明,在室温与环境湿度下放置1年后,纤维未改性的复合材料弯曲强度无显著变化,弯曲模量下降31.5％;纤维经N-羟甲基丙烯酰胺改性的复合材料弯曲强度下降14.6％,弯曲模量下降37.6％.紫外线加速老化200h后,纤维未改性的复合材料弯曲强度、弯曲模量与尺寸均无显著变化.湿热老化对复合材料力学性能有显著影响,沸水浸泡2h后,复合材料弯曲强度保留率为49.4％,弯曲模置保留率为35.6％.%The mechanical properties and dimensional stability of bamboo-chemical-pulp-fiben reinforced unsaturated polyester com-positea after ultraviolet accelerated aging and moisture aging were studied. The effect of fiber modification by N-hydroxymethyl acryl-anu'de (NMA) on the mechanical properties and dimensional stability of composites was investigated. The results showed that the flexural strength of the untreated-fiber reinforced composites did not change significantly after placing in room for 1 year, while the flexural modulus decreased significantly by 31.5%. The flexural strength and flexural modulus of the NMA-treated-fibers reinforced composites decreased by 14.6% and 37.6% , respectively, after placing in room for 1 year. The flexural strength and modulus of composites did not change significantly after 200 h ultraviolet accelerated aging. The width and thickness of composite samples had no significant change too. Moisture aging had a significant effect on the flexural strength and modulus of composites. After soaking in the boiling water for 2 h, the composites had 49.4% and 35.6% of their original flexural strength and modulus, respectively.
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