以超临界CO2为发泡剂,马来酸酐接枝改性聚丙烯（PP-g-MAH）为相容剂,使用单螺杆挤出发泡系统研究了线性均聚聚丙烯（LH-PP）/纳米粘土（Nano-clay）共混物的发泡成型过程,研究了口模温度和共混配方对发泡样品膨胀率、泡孔密度以及口模压力的影响。研究发现,Nano-clay和PP-g-MAH的加入提高了LH-PP/Nano-clay/PP-g-MAH共混物发泡样品的最大膨胀率,与纯LH-PP获得最大膨胀率的发泡温度相比,Nano-clay和PP-g-MAH的加入使得共混体系获得最大膨胀率的发泡温度向低温迁移。此外,研究发现发泡样品的最终膨胀率对温度的关系呈现一种山峰状分布,说明高温下的气体散失及低温下熔体的硬化结晶是影响半结晶聚合物发泡样品膨胀率的两个因素。
Foaming process of linear polypropylene homopolymer（LH-PP）/nano-clay blends was investigated using a single extruder foaming system,with supercritical carbon dioxide as the foaming agent and maleic anhydride grafted polypropylene（PP-g-MAH） as the coupling agent.Influences of die temperature and blending formulation on foam expansion ratio,cell-population density and die pressure were analyzed.Result shows the addition of nano-clay and PP-g-MAH increases the maximum expansion ratio of foamed samples obtained.Compared with pure LH-PP,the addition of nano-clay and PP-g-MAH decreases the foaming temperature of LH-PP/nano-clay/PP-g-MAH blends as maximum expansion ratio is achieved.In addition,we found the curve of the final expansion ratio of PP foam vs.temperature shows a typical mountain shape for each formulation,indicating that gas loss and crystallization stiffening of the melt at low temperature are the two governing factors influencing foam expansion ratio of semi-crystalline polymers.
参考文献
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