Macromolecular Solutions. Solvent–Property Relationships in by Raymond B. Seymour

By Raymond B. Seymour

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South Coast Air Quality Management District; Proposed Rule 1124, April 13, 1979. 3. W. et al. AFML-TR-74-208 1974. a. L. AFML-TR-79-4041 JL979. b. ; Chattopadhyay, Ä T ^ T AFWAL-TR-80-4Q73 -L98Q. a. T. AFML-TR-79-4192 1£79,. b. A. T. 981.. 6. J. "Principles of Polymer Chemistry;" Cornell Univ. , 1953; pp. 577-580. a. Burrell, H. Off. Dig. Fed. Paint Yarn. Prod. Clubs 1955, 2]_, 726. b. M. Chem. Rev. 1975, 7J5(6) , 731. "~W 8. L. , Reinhold Pub. : New York, 1250. 9. S. 10. J. Appl. Chem. 195^, 2> 75.

J. Phys. , 63, 1406-1413. Thomas, N. and A. H. Windle (1978). Transport of Methanol in Poly(methyl methacrylate). Polymer, 19, 255-265. Weiske, C. D. (1964). Chemical Resistance and Stress Cracking of Polyamides (German). Kuntstoffe, 54, 626-634. Wyzgoski, M. G. and C. H. M. Jacques (1977). Stress Cracking of Plastics by Gasoline and Gasoline Components. Polym. Engr. , 17, 854-860. ACKNOWLEDGMENT Discussions of the solvent uptake data with Prof. Harold Hopfenberg of North Carolina State University were most helpful.

Thus absorbed water has a tre­ mendous effect on the stress cracking susceptibility of nylon 6,6 in organic liquids. This is further indicated by the rapid increase in critical strain shown in Fig. 2. 15 cm thick (DuPont Zytel Design Handbook). If water is desorbed from the partially moisturized sample the Macromolecular Solutions mmmm® Fig. 1. 8%. 5 10 Time (Minutes) Fig. 2. 15 Effect of exposure to 50% relative humidity on the critical strain of nylon 6,6 in n-butanol. 5 Low Polarity, Moderate "h" 1,4-Dioxane Low Polarity, High "h" Phenol m-Cresol Moderate Polarity, Low "h" Methyl isobutyl ketone Cyclohexanone Acetone Moderate Polarity, Mod, "h" Diacetone alcohol Tetrahydrofuran Moderate Polarity, High "h" n-Butanol n-Propanol Ethanol High Polarity, Low "h" Nitroethane Acetonitrile High Polarity, Mod.

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