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Kevlar 49 composite performance: Dependence on thermoset resin microstructure
Author(s) -
Timm D. C.,
Ayorinde A. J.,
Lee C. H.,
Steele L. F.,
Plass N. C.
Publication year - 1984
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.760241113
Subject(s) - thermosetting polymer , materials science , composite material , composite number , rosin , polybutadiene , viscoelasticity , diethanolamine , kevlar , microstructure , polymer , copolymer , resin acid , chemical engineering , engineering
Molecular structures for cured, thermoset resins have been examined by analyses of resin extracts by gel permeation chromatography. Numerical interpretation of leached oligomeric fractions coupled with kinetic reaction theory yields microscopic estimates of the network's structure, including crosslink average molecular weight. Leached monomeric fractions describe extent of cure. Analyses of test data incorporate irreversible, mechanical deformations for neat resin castings and for filament wound, Kevlar 49 composites. Heat distortion temperatures correlate with crosslink architecture. Short beam shear strength data for naval ordinance laboratory rings and pressure vessel burst performance are examined in terms of the resin's molecular structure. Variations in resin cure observed by positive feedback via chromatography indicate fluctuations in extent of crosslink development. Test specimen performance correlates with these microscopic, molecular distributions. Resin applications include filament wound composites for the aerospace industry, anhydride cured epoxies, and amine cured epoxies. The former resin is an elastic body at ambient test conditions. A third resin, a crosslinked resin of 1,2 polybutadiene/t‐butylstyrene, is in final developmental stages and may exhibit a higher degree of viscoelastic behavior.