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

作　　者：苗春卉[1] 李敏[1] 王绍凯[1] 杨洁颖[2] 顾轶卓[1] 张佐光[1] 

机构地区：[1]北京航空航天大学材料科学与工程学院,空天材料与服役教育部重点实验室,北京100191 [2]航天特种材料及工艺技术研究所,北京10074

出　　处：《复合材料学报》2010年第4期75-80,共6页Acta Materiae Compositae Sinica

基　　金：航空科学基金(2008ZE51072);国家自然科学基金(50803002);航天支撑技术基金

摘　　要：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.

关 键 词：聚芳基乙炔树脂 复合材料 石英纤维 裂纹缺陷 脆性 酚醛改性 富脂区 

分 类 号：TB332[一般工业技术—材料科学与工程]