摘要
为获得高质量比和高取向度的长纤维增强热塑性复合材料,通过牵切工艺将玻璃纤维和聚丙烯纤维混合成为须条,将须条正交铺层后用热压方法制备玻璃纤维/聚丙烯长纤维热塑性复合材料,然后对复合材料的形貌、力学性能和动态力学性能进行测试和分析。结果表明:复合材料中玻璃纤维的平均长度为22.9 mm,质量分数为45.73%,纤维伸直度高,取向度高,分散性好;基体材料能够充分浸润玻璃纤维,复合材料具有较小的孔隙率,其值为1.58%,且该复合材料比挤出模压得到的复合材料具有更好的力学性能;复合材料的玻璃化转变温度为73.4℃,在温度为150℃时,能够保持较高的储能模量和较小的损耗因子,具有良好的热力学性能。
In order to obtain long fiber reinforced thermoplastic composites with high weight ratios and high degrees of orientation, a stretch-breaking process was adopted to prepare glass fibers(GF) and polypropylene(PP) filaments into bi-component slivers. The slivers were aligned in two perpendicular layers, and the resulted hybrid-fiber was subjected to hot pressing to form GF/PP long fiber reinforced thermoplastic composites. The morphology of the composites was observed, and their static and dynamic mechanical properties were characterized by using the tensile test, bending test, impact test, and dynamic mechanical analysis(DMA). The test results show that glass fibers with an average length of 22.9 mm has high straightness, highly oriented and dispersed in the PP matrix, and accounts for 45.73% of the composites. Glass fibers are fully saturated in the matrix, which provides the composites with a porosity of 1.58%. In comparison of composites prepared by extrusion molding and stretch-breaking process, the latter obtain greater mechanical properties. DMA results show that the glass transition temperature of composites is 73.4 ℃, and the composites retain good thermomechanical properties at 150 ℃ and maintain high storage modulus and small loss factor.
作者
董卫国
DONG Weiguo(School of Textile Science and Engineering,Tianjin Polytechnic University,Tianjin 300387,China;Key Laboratory of Advanced Textile Composites,Ministry of Education,Tianjin Polytechnic University,Tianjin 300387,China)
出处
《纺织学报》
EI
CAS
CSCD
北大核心
2019年第3期71-75,共5页
Journal of Textile Research
基金
国家高技术研究发展计划(863计划)项目(2012AA03A204)
关键词
热塑复合材料
混纤预型件
玻璃纤维
聚丙烯纤维
力学性能
thermoplastic composite
hybrid fiber preform
glass fiber
polypropylene fiber
mechanical property
