Morphological characteristics and transparence properties of OMMT/PEO-PP composites
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摘要: 通过熔融共混制备了有机蒙脱土 (OMMT)/聚氧化乙烯(PEO)- 聚丙烯(PP)复合材料, 采用TEM、 SEM、 DSC、 透光率分析等手段研究了OMMT在PEO-PP共混物中的分布及OMMT对共混物相形态、 OMMT含量对复合材料透光率的影响。结果表明, OMMT选择性分布在PEO分散相内部及两相界面, 对PEO-PP共混物起到增容作用, OMMT 的加入使PEO相粒径得到细化, 粒径尺寸趋于均匀, PP球晶尺寸明显减小, 复合材料的透明性显著增加。Abstract: Poly(ethylene oxide) (PEO)-polypropylene (PP) blends containing organic-montmorillonite (OMMT)/poly(ethylene oxide) (PEO)-polypropylene (PP) composites were prepared using a twin screw extruder followed by the injection molding. The effects of OMMT loading on the morphology and transparent properties of the OMMT/PEO-PP composites were investigated in detail with a combination of TEM and SEM measurements. The crystallization and melt behavior of OMMT/PEO-PP composites were studied by means of DSC and POM. It is found that in all blends the OMMT are preferentially located within the PEO phase and around the interfaces of PEO and PP phases. SEM reveales a large reduction in PEO domain size when OMMT is used. The PP crystal sizes decrease significantly with OMMT content increasing. It is also shown that the incorporation of a small amount of OMMT induces a dramatic transformation from an opaque to a transparent system.
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Keywords:
- PP /
- PEO /
- OMMT /
- morphology /
- transparency
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