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Degradation of Polyolefin Blends Used for Ceramic Injection Molding
Author(s) -
Wright Judith K.,
Evans Julian R. G.,
Edirisinghe Mohan J.
Publication year - 1989
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1989.tb05985.x
Subject(s) - polyolefin , thermogravimetric analysis , degradation (telecommunications) , oxidizing agent , materials science , ceramic , molding (decorative) , polymer , composite material , evaporation , chemical engineering , polymer chemistry , chemistry , organic chemistry , telecommunications , physics , layer (electronics) , computer science , engineering , thermodynamics
The degradation mechanisms of four polyolefins of differing molecular weight were studied by thermogravimetric analysis in order to identify the material properties which facilitate the extraction of ceramic injection molding vehicles. Three weight‐loss processes were identified and the corresponding activation energies were calculated. Low‐molecular‐weight vehicles were lost entirely by evaporation while higher‐molecular‐weight polymers underwent thermal degradation followed by evaporation of degration products. In oxidizing atmosphere the influence of oxidative degradation was confined to the surface region of moldings. It is shown that the summation of individual thermograms gives guidance on the likely weight loss behavior of blends.