摘要
聚芳基乙炔(PAA)树脂以其高残碳率、低吸水性等特点,成为烧蚀防热复合材料的理想基体。使用酚醛树脂对PAA树脂进行了改性,分析了改性前后不同树脂体系的固化反应特性和收缩特性;使用不同纤维/树脂体系制造复合材料层合板,测试了层合板弯曲、压缩和层间剪切性能,对比了不同体系层合板截面及断面形貌。结果表明:使用酚醛改性后的PAA树脂制造的层合板力学性能有比较明显的提升,层合板中缺陷明显减少;酚醛树脂改性后,可降低PAA树脂的固化收缩率,减小PAA树脂的表面张力,在固化过程中,酚醛树脂与PAA树脂发生预聚,这些性能与固化特性改变均能减少层合板的缺陷。
Polyarylene acetylene(PAA)resin is an ideal substrate for ablative thermal protection composite materials because of its high carbon residue rate and low water absorbency.The PAA resin was modified by phenolic resin.The curing reaction characteristics and shrinkage characteristics of different resin systems were analyzed before and after the modification.Composite laminates were made with different fiber/resin systems.The bending and interlaminar shear properties of laminates were tested,and the cross section and the fracture appearance of different system laminates were compared.The results show that the mechanical properties of the laminates made of PAA resin modified by phenolic resin are obviously improved,and the defects in the laminates are obviously reduced.After the modification of the phenolic resin,the curing shrinkage of the PAA resin is reduced and the surface tension of the PAA resin is reduced.In the curing process,the phenolic resin and the PAA resin are prepolymerized.These properties and the change of curing properties can reduce the defects of the laminate.
作者
苗春卉
翟全胜
叶宏军
赵艳文
MIAO Chun-hui;ZHAI Quan-sheng;YE Hong-jun;ZHAO Yan-wen(AVIC Composite Corporation, Beijing 101300, China)
出处
《玻璃钢／复合材料》
CSCD
北大核心
2018年第12期82-88,共7页
Fiber Reinforced Plastics/Composites
关键词
聚芳基乙炔树脂
复合材料
酚醛改性
裂纹缺陷
polyarylacetylene resin
composites
phenolic modification
crack defect
