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The relationship between processing conditions, morphological structure and mechanical properties of knit lines of an injection molded semi‐crystalline thermoplastic
Author(s) -
Singh D.,
Moslé H. G.
Publication year - 1988
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19880200151
Subject(s) - spherulite (polymer physics) , crystallinity , materials science , composite material , polypropylene , weld line , molding (decorative) , ultimate tensile strength , thermoplastic , elastic modulus , polymer , welding
The structure‐property relationship of injection molded polypropylene samples with knit lines was investigated. Double gated tensile bars were injection molded under different molding conditions in order to study the influence of molding parameters on crystallinity and spherulite diameter. It was observed that the degree of crystallinity and spherulite size were highly dependent on cooling rate. To improve weld line strength and elastic modulus, an increase in crystalline fraction and the diameter of the crystalline aggregates seems to be necessary.