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Effects of moisture on glycidyl reactions with carboxylic acid anhydrides
Author(s) -
Kaplan S. L.,
McAllister L. E.,
Stewart A. T.
Publication year - 1966
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760060112
Subject(s) - epoxy , materials science , moisture , hydrolysis , composite material , composite number , infrared spectroscopy , heat deflection temperature , water content , chemical engineering , polymer chemistry , organic chemistry , chemistry , izod impact strength test , geotechnical engineering , engineering , ultimate tensile strength
Moisture present in epoxy anhyride composites may hydrolyze the anhydride and cause major changes in the mechanical and chemical properties of the final composite. Heat distortion data and infrared spectroscopy are used to analyze the changes caused by the presence of the moisture. As the concentraton of water is increased, there is a decrease in the heat distortion or gass transition temperature. The decrease is due to a change in the crosslinking network and is caused by the reduction of the functonality of the epoxy group for acid as compared to the anhydride. Where rigid specifications must be met it is essential that the moisture level in the fillers, resins, etc. be kept constant.