聚芳基乙炔树脂基复合材料固化缺陷的产生机制

Formation mechanism of curing defects in polyarylacetylene matrix composite

针对石英纤维增强聚芳基乙炔(PAA)树脂基复合材料固化微裂纹缺陷问题,采用差示扫描量热、红外光谱、顶杆示差、三点弯曲及金相分析等方法,通过PAA树脂的固化反应、收缩特性分析,研究了树脂浇注体力学性能、增强体结构形式、纤维体积分数对裂纹缺陷产生的影响。结果表明,PAA树脂固化收缩率大、树脂脆性是PAA复合材料中裂纹缺陷产生的主要原因,提高纤维含量、减少富树脂区有助于抑制裂纹缺陷,并且采用酚醛树脂对PAA进行改性后,亦可有效减少裂纹的产生。

The formation mechanism of crack defects in resin-rich areas was studied for the quartz fiber reinforced polyarylacetylene（PAA） composite. The curing characteristic and shrinkage o{ PAA resin were evaluated by means of differential scanning calorimetry, infrared ray, three-point bending and micrograph. Moreover, the influences of mechanical performances of PAA resin, preform structure and fiber volume fraction on formation of crack defects were investigated. The results indicate that large curing shrinkage and brittleness of PAA resin are the main reasons for crack defects, and the crack defects can be reduced by increasing the fiber volume fraction and reducing the resin - rich area. Besides, resin modification by phenolic resin was proved to be an effective method to reduce crack defects.