摘要
研究了PP-MAH对注射成型PP/汉麻纤维(HFs)复合材料的皮-芯层形态结构及力学性能的影响。结果表明,未添加PP-MAH的复合材料体系中,HFs在注塑试样皮层和芯层沿流动方向高度取向。在试样皮层,HFs诱导PP产生β晶。试样皮层呈现韧性断裂行为,而芯层则发生脆性断裂;添加5份(质量份数,下同)PP-MAH后,HFs在注塑试样皮层高度取向,然而在试样芯层HFs呈现无规则分布。与未添加PP-MAH的体系相比,试样皮层中,HFs诱导PP产生β晶能力减弱,复合材料的冲击强度稍有降低,且皮层和芯层试样均呈脆性断裂行为。添加PP-MAH的复合体系拉伸强度和弯曲强度则呈明显提高趋势。
This paper investigated the influence of PP-MAH on skin/core morphology and mechanical properties of injection molded polypropylene/hemp fiber composites. Without PP-MAH, highly oriented HFs along flowing direction was observed in both skin and core zone of the specimen. Moreover, the incorporation of HFs induced the formation of β-form crystal in skin zone. The skin zone showed ductile fracture while core zone brittle fracture. When 5 phr PPMAH was introduced, only in the skin zone was highly oriented HFs observed, in the core zone but random ones. The relative content of β-form crystals in the skin zone was reduced. Impact strength of the composite decreased slightly. Brittle fracture behavior in both skin and core zone of the composite was observed. Additionally, the tensile and flexural strengths were significantly improved with the presence of PP-MAH.
出处
《中国塑料》
CAS
CSCD
北大核心
2010年第12期46-51,共6页
China Plastics
关键词
聚丙烯
汉麻纤维
皮一芯结构
力学性能
冲击韧性
polypropylene
hemp fiber
skin-core morphology
mechanical property
impact strength
