Abstract
The authors studied the growth of rupture cracks in polymethylmethacrylate (PMM) specimens, the nucleation and growth of a pencil of cracks at the tip of a rupture crack under the influence of various working media, the kinetics of stress relaxation in bent specimens and the dependence of the critical breaking stress of PMM specimens with stress raisers on the time during which this polymer is held under stress in various working media. The results obtained were interpreted on the basis of an assumption that the adsorption-effect is mainly manifested in the initial stages of the action of a working medium; the variation in the above-listed properties due to protracted action of the working media is produced by penetration of these media into the supermolecular polymer structures. Dipole moment, polarizability, and the degree of association of medium molecules were chosen as the criteria of the influence of working media on PMM.
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