摘要
为了揭示在玻璃纤维增强聚丙烯(GFRPP)复合材料注塑制品的表面极易出现“浮纤”的关键原因,采用X射线断层扫描成像技术(X-CT)、光学显微镜(OM)、热重分析(TGA)、扫描电子显微镜(SEM)以及X射线能谱仪(EDS)等方法对比分析了具有不同熔体质量流动速率PP基体的复合材料制品中的GF分散和分布规律。结果表明,提高PP基体的熔体流动性有利于促进GF沿流动方向高度取向、抑制表面“浮纤”的产生,但所有制品芯层部位的GF含量均高于皮层,说明“浮纤”并不能简单归因于GF在注塑过程中向制品表面的浮动。进一步分析发现,GF在注塑充模过程中出现的翻滚、打转等不稳定流动行为才是造成“浮纤”产生的最主要原因。提高PP基体的熔体流动性可很好地抑制GF的不稳定流动,进而实现“浮纤”的显著改善。
To reveal the key reasons for the formation of“floating fiber”on the injection-molded product surface of glass fiber reinforced polypropylene(GFRPP)composites,the dispersion and distribution states of GF in the products with different melt flow rates of PP matrix had been comparatively analyzed by using X-ray tomography(X-CT),optical microscopy(OM),thermogravimetric analysis(TGA),scanning electron microscope(SEM),and energy dispersive X-ray(EDS).The results show that improving the melt flowability of the PP matrix is beneficial to promote the orientation of GF along the flow direction and suppress the formation of“floating fiber”on the product surface,but the GF content in the core layer is higher than that in the skin layer for all products.It indicates that the“floating fiber”is not resulted from the floating of GF to the product surface during injection molding.Further analysis suggests that the unstable flow behaviors,such as,tumbling and spinning of GF in the injection molding is the main reason for the“floating fiber”.With increasing melt flowability of PP matrix,the unstable flow behaviors of GF can be suppressed and thus the“floating fiber”is significantly improved.
作者
刘建萍
康鹏
高达利
郑云磊
白红伟
傅强
LIU Jianping;KANG Peng;GAO Dali;ZHENG Yunlei;BAI Hongwei;FU Qiang(College of Polymer Science and Engineering,State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,China;SINOPEC Beijing Research Institute of Chemical Industry,Beijing 100013,China;CGN Juner New Materials Co.,Ltd.,Wenzhou 325011,China)
出处
《塑料工业》
CAS
CSCD
北大核心
2022年第11期69-75,共7页
China Plastics Industry
基金
中国石油化工股份有限公司科技部项目(项目号219047)。
关键词
聚丙烯
玻璃纤维
浮纤
Polypropylene
Glass Fiber
Floating Fiber
