摘要
以可膨胀微球Expancel951DUl20为发泡剂，采用熔融共混制备了不同质量配比的聚乳酸／可膨胀微球（PLA／Expancel）共混物，在平板硫化机中发泡后制得发泡样品。通过扫描电子显微镜（SEM）、导热系数仪以及弯曲和冲击测试等，表征了Expancel微球受热前后的形态特征变化，分析了各项工艺参数和Expancel用量对PLA／Expancel发泡体密度、力学性能、泡孔形态、热阻隔性以及吸水率的影响。结果表明，Expancel微球膨胀后的体积是膨胀前的40—50倍，低剪切速率更有利于微球与PIA的共混；发泡体密度随Expancel用量增加而减小，力学性能也随之下降，具有完全闭孔结构，热阻隔性大大提高，吸水率约为1％。
Expancel 951DU120 expandable microspheres were used as the blowing agent and introduced into the polylatic acid （PLA） /expandable microspheres （PLA/Expancel） blends via melt blending; then, the PLA foams were prepared by curing press. The morphological changes of Expancel microspheres before and after heating, and the influence of various process parameters on the density, cell morphology, mechanical properties, thermal barrier property, water absorption of the PLA/Expancel foams were studied by means of scanning electron microscopy （ SEM）, thermal conductivity meter and bending and impact tests. The results indicate that the expansion rate of Expancel microspheres is about 40 - 50 times than that of the untreated microspheres. Lower shear rate is conducive to the microspheres and PLA blending. With the increase of dosage of Expaneel, the density and mechanical properties of the PLA foams decrease. With a fully closed cell structure, the thermal barrier property is greatly increased and the water absorption is about 1%.
出处
《塑料工业》
CAS
CSCD
北大核心
2016年第5期58-61,87,共5页
China Plastics Industry
关键词
可膨胀微球
聚乳酸
发泡
轻质化
Expandable Microspheres
Poly （ lactic acid）
Foaming
Light Weight
