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RTM用炔基改性苯并噁嗪树脂工艺及力学性能
孙宝岗, 杨昆晓, 雷琴, 史汉桥
航天材料及工艺研究所,北京 100076
摘要:
为改善苯并噁嗪树脂对树脂传递模塑(RTM)成型工艺的适应性,并进一步提升苯丙噁嗪基复合材料的耐高温性能。提出利用炔基改性苯并噁嗪树脂,以提高树脂的交联密度,并改善树脂流变特性。结果表明:改性后的炔基苯并噁嗪树脂在81.5 ℃时黏度低至805 mPa·s可满足RTM工艺灌注要求,在110 ℃其工艺窗口高达310 min。同时,炔基苯并噁嗪树脂的起始固化温度低至130 ℃,固化温度为167 ℃,后处理温度为208 ℃,满足低温固化要求。通过DMA与TGA分析,RTM成型低温固化苯并噁嗪/碳纤维复合材料的Tg为411 ℃,在N2环境下800 ℃残留率高达88.6%,表明其复合材料具有良好的耐高温性能。SEM观察发现该树脂与纤维界面粘结强度较高,碳纤维复合材料350 ℃拉伸性能保留率达99%以上,弯曲、层剪性能保留率达70%以上,压缩性能保留率也达60.9%。
关键词:  苯并噁嗪  RTM低温成型  耐高温树脂  工艺性
DOI:10.12044/j.issn.1007-2330.2019.01.007
分类号:
基金项目:
Processing and Mechanical Properties of Acetylene-FunctionalBenzoxazine for Resin Transfer Molding
SUN Baogang, YANG Kunxiao, LEI Qin, SHI Hanqiao
Aerospace Research Institute of Materials & Processing Technology,Beijing 100076
Abstract:
To improve the processing properties of benzoxazine for resin transfer moulding(RTM) and high temperature resistance of benzoxazine based composites,acetylene group was used to modify benzoxazine resin.With the participate of acetylene group,the cured benzoxazine resin could have a higher crosslink density ,and the resin would exhibits a lower viscosity.The results shows that the acetylene-functional benzoxazine(AFBA)exhibits a viscosity of 805 mPa·s at 81.5 ℃,and it is suitable for RTM at 110 ℃ with 310 min.According to the DSC results,the curing of AFBA started from 130 ℃ and ended at 208 ℃.The DMA and TGA curves of AFBA/CF composites exhibit a glass transition temperature peak at 411 ℃ and a char yield of 88.6% at 800 ℃.Moreover,the composites retained more than 99% of tensile properties,more than 70% of flexural and interlaminar shear properties and 60.9% of compressive strength at 350 ℃.
Key words:  Benzoxazine  RTM in low temperature  High temperature resistance resin  Processing properties