冷却速率对PP/GF微发泡复合材料发泡行为及力学性能的影响  

Effect of Cooling Rate on the Foaming Behaviors and Mechanical Properties of PP / GF Micro-foaming Composites

作　　者：高萍[1,2] 何力[1,2] 王昌银[2] 蒋团辉[2] 王醴均[2] 龚维[2,3] 

机构地区：[1]贵州大学化学与化工学院,贵州贵阳550025 [2]国家复合改性聚合物材料工程技术研究中心,贵州贵阳550014 [3]贵州师范大学材料与建筑工程学院,贵州贵阳550014

出　　处：《塑料工业》2016年第1期56-59,70,共5页China Plastics Industry

基　　金：黔科合重大专项字(2012)6023号;黔科合人才团队[2014]4006号;白科合同[2014]82号

摘　　要：采用化学发泡法注塑成型工艺制备了聚丙烯/玻纤(PP/GF)复合发泡材料,研究了冷却速率对其发泡行为和力学性能的影响,并通过流变测试分析了复合材料不同冷却速率下的黏弹性变化规律。结果表明,冷却速率提高,复合材料的黏弹响应越明显,从而改善了PP/GF复合材料的发泡行为。当冷却速率为6.6℃/s时,PP/GF复合材料的发泡效果最好,泡孔平均直径为29.54μm,泡孔密度为1.01×10~7个/cm^3;此时材料的力学性能最优,拉伸和冲击强度最大,分别为39.8 MPa和5.52 k J/m^2。The PP/GF micro-foaming composites were prepared by chemical foaming method in an injection molding machine. This study focused on the effects of the cooling rate on the foaming behaviors and mechanical properties of the composites, and the rheological properties were also analyzed under different cooling rates. The results indicate that the foaming behavior improves with the increase of cooling rate, which is ascribed to the enhanced rheological response. When the cooling rate is 6. 6 ℃/s, the foaming behavior of PP/GF composites is the best, the average cell diameter is 29.54 μm and the cell density is 1.01×10^7cells/ cm^3 ; meanwhile, the tensile and impact strength of the composite at this cooling rate reach the highest values of 39.8 MPa and 5.52 kJ/m^2, respectively.

关 键 词：化学发泡 冷却速率 流变性能 发泡行为 力学性能 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]