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To study the aging principle of sealing performance of nitrile butadiene rubber (NBR), a mathematical model is proposed based on the correlation between mechanical performance and microscopic flaws. We assume that oxidative cross-linking and molecular chain scission are two main microscopic flaws of NBR, which could result in performance degradation. In this paper, we use Kinetics model to relate...
Phenomenological description of below-Tg structural relaxation known as long-term natural physical ageing in network glass formers exemplified by binary arsenic selenides was adequately developed within first-order kinetics. This kinetics was shown to obey a character stretched exponentional behavior being treated as sequence of aligning-shrinkage stages throughtout glassy matrix.
We have applied infrared, Raman and UV-VIS spectroscopy to measure spatially resolved chemical composition and structure of cross-linked polyethylene insulated cables used in the EC-funded Artemis project, both before and after electrical and thermal stressing. The work shows that diffusion of the primary products of chemical crosslinking changes the quasi-parabolic concentration radial profile present...
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