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Orientation of HDPE inclusions within solid‐state drawn rubber‐modified isotactic polypropylene: DSC insight
Author(s) -
Sližová Marta,
Raab Miroslav
Publication year - 2013
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.39207
Subject(s) - high density polyethylene , materials science , tacticity , differential scanning calorimetry , natural rubber , composite material , polypropylene , charpy impact test , polymer chemistry , polyethylene , melting point , polymer , microstructure , polymerization , thermodynamics , physics
Effect of drawing temperature on the melting behavior of oriented isotactic polypropylene (PP) modified with ethylene‐propylene‐diene monomer rubber with a small amount of high‐density polyethylene (HDPE) is explored in this study. Injection‐molded specimens both neat and 8 vol % modified PP were solid‐state drawn to natural drawing ratio and characterized by X‐ray diffraction, dynamic mechanical analysis (DMA), Charpy impact test and differential scanning calorimetry (DSC). A synergy of orientation and embedding rubber particles caused a significant increase of low‐temperature notched impact strength of oriented blends. It was shown, that the DSC method can be used successfully for the indirect but very sensitive characterization of orientation on a nanometre scale. At the drawing temperature of 120°C, the DSC data indicated an incomplete transition of the PP crystalline structure: This is reflected by splitting and shifting of the melting peak of PP. An increase of the melting temperature of the HDPE inclusions by 3.5°C reflects the high orientation. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013