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Control of phase separation and voiding in oil‐filled polypropylene
Author(s) -
Pratt C. F.,
Hobbs S. Y.
Publication year - 1974
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.1974.070181210
Subject(s) - polypropylene , materials science , ultimate tensile strength , spherulite (polymer physics) , composite material , dispersion (optics) , molding (decorative) , elongation , viscosity , phase (matter) , nucleation , polymer , chemistry , organic chemistry , physics , optics
The physical properties, morphologies, and fracture characteristics of samples injection molded from blends of polypropylene and a low‐viscosity hydrocarbon oil are described. Unexpectedly large improvements in mechanical and optical properties are found to occur on the addition of a nucleating agent (copper phthalocyanine). Both the ultimate tensile strength and the elongation of unnucleated samples are doubled by incorporation of as little as 0.01% of the nucleant. Similar increases in the properties of unnucleated blends are observed when the barrel temperature of the molding machine is reduced. In both cases, marked improvements in visual uniformity occur. It is shown that these gains can be correlated with improved dispersion of the oil as spherulite size is reduced.