热压成型聚丙烯/玻璃纤维复合膜的结构及力学性能

Structure and Mechanical Properties of PP/GF Composite Films Prepared by Hot Pressing Molding

将酸刻蚀后的玻璃纤维(GF)网引入聚丙烯(PP)基体,通过热压成型技术制备PP/GF复合膜。综合利用X射线衍射仪、差示扫描量热仪、扫描电子显微镜和万能材料试验机对PP/GF复合膜的结晶结构、热行为、界面结合形态和力学性能进行表征分析,重点讨论GF含量对微结构及性能的影响。结果表明,经酸刻蚀后GF表面形成许多沟槽,粗糙度增大,提高了GF与PP基体间的界面结合强度;GF网的引入使成核点增多,结晶度增加;GF含量较低时,PP/GF复合膜的力学性能与PP相比显著提高,GF含量为0.2%(质量分数,下同)时,PP/GF复合膜的拉伸强度和断裂韧性分别提高了33.75%和41.15%;随GF含量的增加,拉伸强度和断裂韧性呈减小的趋势。

PP/GF composite films were prepared with the acid-corroded glass fiber(GF)net introduced into polypropy-lene(PP)matrix by a hot-pressing molding technique.Their crystalline structure,thermal behavior,interfacial morphology and mechanical properties were characterized using scanning electron microscope,wide-angle X-ray diffraction,dif-ferential scanning calorimeter and universal material testing machine.The effect of GF content on the microstructure and mechanical properties was emphatically discussed.The results indicated that there were many grooves developed on the surface of GF after being etched with acid,leading to an increase in surface roughness.This is helpful to improve the interfacial adhesion between GF and PP.The nucleation points were increased with the addition of acid-treated GF,resul-ting in an increase in crystallinity.The mechanical properties of the PP/GF films at a low content of GF were improved significantly compared to pure PP samples,and their tensile strength and toughness increased by 33.75%and 41.15%at a GF content of 0.2 wt%,respectively.In addition,the tensile strength and toughness tended to decrease with an in-crease in the GF content.