Transcription of A Materials Aging Problem in Theory and Practice
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A Materials Aging Problem in Theory and Practice
JOHNS HOPKINS APL TECHNICAL DIGEST, VOLUME 21,NUMBER 4 (2000)575A Materials Aging PROBELM IN Theory AND PRACTICEPA Materials Aging Problem in Theory and PracticeLawrence W. Hunter, James W. White, Paul H. Cohen, and Paul J. Biermannolyesters are widely used in plastic objects, films, and fabrics. A recurringmechanism of polyester Aging is attack by humidity (hydrolysis), whereby the longchain molecules are cleaved and the material softens. This article offers an approach formodeling the hardness/ Aging behavior of commercial polyesters. The model isqualitatively consistent with exposure tests on fresh polyester plastic material madefrom a commercially available resin and hardening agent. It expresses the rate ofpolyester hydrolysis in terms of the relative humidity, and then connects the degree ofhydrolysis to hardness using a relation that accounts for stabilizers that are present incommercial polymers to counter the hydrolysis.
JOHNS HOPKINS APL TECHNICAL DIGEST, VOLUME 21,NUMBER 4 (2000)575 A MATERIALS AGING PROBELM IN THEORY AND PRACTICE P A Materials Aging Problem in Theory and Practice
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