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Dependence of electrical breakdown on spherulite size in isotactic polypropylene
Author(s) -
Ceres B. V.,
Schultz J. M.
Publication year - 1984
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.1984.070291248
Subject(s) - spherulite (polymer physics) , crystallinity , tacticity , materials science , crystallization , lamellar structure , polypropylene , composite material , isothermal process , polymer chemistry , chemical engineering , thermodynamics , polymer , polymerization , physics , engineering
A self‐seeding technique, coupled with isothermal crystallization, was used to prepare isotactic polypropylene specimens of varying spherulite size, but of constant crystallinity and lamellar thickness. The latter quantities were also varied by changing the isothermal crystallization temperature. The electrical lifetime at constant applied voltage, in a point‐plane geometry, was measured. It was found that the electrical lifetime decreased with increasing spherulite size and, more weakly, with decreasing crystallinity (at a given spherulite size).