Transmission electron microscopy study of phase morphology in polypropylene/ethylene-octene copolymer blends

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...

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Bibliographic Details
Published in:European polymer journal 2009-05, Vol.45 (5), p.1485-1492
Main Authors: Svoboda, Petr, Svobodova, Dagmar, Slobodian, Petr, Ougizawa, Toshiaki, Inoue, Takashi
Format: Article
Language:English
Subjects:
Applied sciences
DSC
Ethylene-octene copolymer
Exact sciences and technology
Organic polymers
Partial miscibility
Phase morphology
Physicochemistry of polymers
Polypropylene
Properties and characterization
Structure, morphology and analysis
TEM
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Summary: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 ( T g) shift indicated partial miscibility. Partial miscibility was then confirmed by direct observation of bright PP lamellae in EOC dark phase.
ISSN:0014-3057
1873-1945
DOI:10.1016/j.eurpolymj.2009.01.032