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CTPB Cure Studies‐effect of experimental variables on epoxide cure and properties of gumstocks
Author(s) -
McGuchan R.,
Spickernell G. J.
Publication year - 1976
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/prep.19760010205
Subject(s) - epoxide , ammonium perchlorate , prepolymer , epoxy , materials science , ultimate tensile strength , composite material , viscosity , impurity , catalysis , polymer chemistry , chemical engineering , organic chemistry , chemistry , polyurethane , engineering , composite number
The effects of various processing and compositional variables the cure rate and mechanical properties of epoxide‐cured CTPB gumstocks have been evaluated. Viscosity changes during the initial stages of cure and tensile properties of fully cured gumstocks are sensitive to the nature and functionality of the epoxide curative even though comparisons are made at epoxy/carboxyl equivalence ratios giving the same density of crosslinks. Batch‐to‐batch variations in prepolymer structure, functionality and impurities also are important. In particular, glutaric acid impurity inhibits the cure, the effect being very marked when the mixing procedure involves heating the prepolymer and catalyst together before the addition of epoxide. Effects due to plasticisers and ammonium perchlorate filler also are reported. The mechanical behaviour of gumstocks and of corresponding filled systems (propellants) show little correlation.