不同长度玻璃纤维对PP微孔发泡材料流变行为与拉伸性能的影响  

Effect of Different Lengths of Glass Fiber on Rheological Behavior and Tensile Properties of PP Microcellular Foams

作　　者：吴珊 陈晓露 龙绍檑 WU Shan;CHEN Xiao-lu;LONG Shao-lei(School of Chemistry and Materials Science,Guizhou Education University,Guiyang 550018,China;College of Materials and Metallurgy Engineering,Guizhou Institute of Technology,Guiyang 550003,China)

机构地区：[1]贵州师范学院化学与材料学院,贵州贵阳550018 [2]贵州理工学院能源与材料工程学院,贵州贵阳550003

出　　处：《塑料科技》2023年第8期43-47,共5页Plastics Science and Technology

基　　金：贵州师范学院博士校级项目(2020BS029);贵州省普通高等学校青年科技人才成长项目(黔教合KY[2021]244)。

摘　　要：文章以聚丙烯(PP)为基体材料,分别加入AC发泡剂,发泡助剂以及不同长度的无碱玻璃纤维(GF),注塑成型制备PP/GF微孔发泡材料,研究不同长度GF对PP材料发泡行为及拉伸性能的影响。结果表明:GF作为异相形核剂,可以增加泡孔密度,泡孔形态更规则,平均泡孔直径较小。低含量不同长度GF的添加,可以改变复合材料的黏弹性,其中短GF(长度为3.0 mm、200目)使得PP复合材料的复数黏度均高于纯PP,长GF(长度为4.5 mm)却使得PP复合材料的复数黏度略低于纯PP。短GF的加入能够起物理交联点的作用限制分子链的运动,增大体系内部摩擦、弹性,增加体系黏度;而长GF却能作为刚性流动单元,促进分子链的运动,降低体系黏度。加入GF可以提高PP/GF复合材料的拉伸强度,但是当泡孔存在时,低含量的GF无法抵消有效承载面积降低造成的强度下降,增强效果不明显。PP/GF microcellular foaming materials were prepared by injection molding with polypropylene(PP)as matrix material,adding AC foaming agent,foaming aids and alkali-free glass fiber(GF)with different lengths respectively.The effects of GF with different lengths on the foaming behavior and tensile properties of PP materials were studied.The results show that GF,as a heterogeneous nucleating agent,can increase the cell density,the cell morphology is more regular,and the average cell diameter is smaller.The addition of low content of GF with different lengths can change the viscoelasticity of the composites.The short GF(length of 3.0 mm,200 mesh)makes the complex viscosity of PP composites higher than that of pure PP,while the long GF(length of 4.5 mm)makes the complex viscosity of PP composites slightly lower than that of pure PP.The addition of short GF can play the role of physical crosslinking point to limit the movement of molecular chains,increase the internal friction and elasticity of the system,and increase the viscosity of the system.However,long GF can be used as a rigid flow unit to promote the movement of molecular chains and reduce the viscosity of the system.The addition of GF can improve the tensile strength of PP/GF composites,but when the cells exist,the low content of GF cannot offset the decrease of strength caused by the decrease of effective bearing area,and the enhancement effect is not obvious.

关 键 词：聚丙烯 玻璃纤维 微孔发泡 拉伸性能 

分 类 号：TB332[一般工业技术—材料科学与工程] TQ325.14[化学工程—合成树脂塑料工业]