Chemorheological Studies on the Environmental Susceptibility of a Model System for Adhesives and Sealants
Kar T. Tan, David J. Benatti, Christopher C. White, Donald L. Hunston
The degradation of styrene-butadiene-styrene triblock copolymer has been characterized using DMTA, FTIR-transmission and UV-Vis spectroscopies. From FTIR analysis, it is evident that the oxidative degradation leads to the formation of hydroxyl and carbonyl products. The degradation process essentially proceeds by end-chain scission and cross-linking reactions in the butadiene unit of the exposed specimens. Such oxidative cross-linking reactions render the specimens brittle, causing it to lose its desired mechanical properties. Indeed, an increase in the transition temperature of the butadiene unit, as well as an increase in the storage modulus of the specimens, has been observed using DMTA. Therefore, the chemical property changes show a good agreement with the mechanical property changes as the specimens degrade.
, Benatti, D.
, White, C.
and Hunston, D.
Chemorheological Studies on the Environmental Susceptibility of a Model System for Adhesives and Sealants, Adhesion Society | 29th | | Annual Meeting, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=860637
(Accessed December 1, 2023)