Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5207490 | Polymer Testing | 2009 | 8 Pages |
Abstract
Blends of polypropylene and ethylene-octene copolymers (EOC) were investigated by transmission electron microscopy, optical microscopy and differential scanning calorimetry (DSC). The main focus was on phase morphology and crystallization for blends containing EOC with different octene content (28, 37 and 52Â wt.%). Also, for a given octene content (37Â wt.%), the effect of molecular weight (115, 180, 229k) of EOC on morphology was observed. The largest particles were found in the blend with EOC-28 and the smallest with EOC-52. This blend with the smallest particles exhibits the fastest crystallization kinetics by two independent methods, optical microscopy and DSC. This behavior was explained by a model. Crystallizing polypropylene lamellae have to travel a longer distance going around large particles, which slows down overall crystallization growth rate. In the case of smaller particles, the obstacles are smaller and the crystallization is faster.
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Authors
Petr Svoboda, Dagmar Svobodova, Petr Slobodian, Toshiaki Ougizawa, Takashi Inoue,