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Transmission electron microscopy study of phase morphology in polypropylene/ethylene-octene copolymer blends |
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| Authors: | Petr Svoboda Dagmar Svobodova Toshiaki Ougizawa |
| Affiliation: | a Faculty of Technology, Tomas Bata University in Zlin, Nam. TGM 275, 762 72 Zlin, Czech Republic b Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1-S8-33, Ookayama, Meguro-ku, Tokyo 152-8552, Japan c Department of Polymer Science and Engineering, Yamagata University, Yonezawa 992-8510, Japan |
| Abstract: | Blends of polypropylene (PP) and ethylene-octene copolymers (EOC) were investigated by transmission electron microscopy (TEM) and by differential scanning calorimetry (DSC). The EOC contained 28, 37, 40 or 52 wt% of octene. Only the 50/50 PP/EOC ratio was used for all blends. None of the blends was fully miscible, there was always two-phase morphology. TEM observation followed by image analysis by ImageJ software revealed that the largest particles were in blend containing EOC-28 and the smallest were in blend with EOC-52. The coarsening rate at 200 °C was evaluated by TEM. The glass transition temperature (Tg) shift indicated partial miscibility. Partial miscibility was then confirmed by direct observation of bright PP lamellae in EOC dark phase. |
| Keywords: | Polypropylene Ethylene-octene copolymer Phase morphology TEM DSC Partial miscibility |
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