Effects of Solvents on Craze Initiation and Crack Propagation in Transparent Polymers

Download or read book Effects of Solvents on Craze Initiation and Crack Propagation in Transparent Polymers written by and published by . This book was released on 1989 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transparent polymers being considered for use in Army systems must be evaluated for resistance to crack and craze growth in a chemical environment. Current test for determining craze initiation include environmental stress crazing tests based on ASTM D 790 and ASTM F 484. Results for a series of cast and biaxially stretched poly(methyl methacrylate) (PMMA) materials, as well as several formulations of polycarbonate, show a range of critical strain measurements in crazing solvents. A polyurethane based thermoset material showed superior resistance to crazing in several of these solvents. The effect of solvents on crack propagation in transparent polymers is demonstrated by a Samples of PMMA are tested in o-xylene, and air. Immersion testing is also used for comparison. Polymethyl methacrylates.