Viscoelasticity and Tearing Energy of Fluorinated Hydrocarbon Elastomers.

摘要

Nearly all fractures of polymeric materials occur during dissipative deformations. Thus, their strength is determined by the number of associated or relevant viscoelastic mechanisms present in their response. A number of investigations have contributed to the establishment of the preceding conclusion. Only with great care and effort can fractures be brought about at relatively high temperatures and long times, or in the swollen state, so that chemical bond strengths can principally determine the material's strength. This study has been directed toward the elucidation of how molecular architecture and the chemical type of network polymer determine the viscoelastic processes which are relevant to fracture behavior. Several series of elastomeric materials have been studied. Both the fracture and the viscoelastic behavior of urethane end-linked polybutadienes, dicumyl peroxide crosslinked polybutadienes, fluorinated hydrocarbon elastomers ('Viton' A fluoroelastomer), and a urethane end-linked styrene-butadiene rubber (SBR) have been determined. Reprints. (jes)