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Gas permeability, water absorption, hydrolytic stability and air-oven aging of polyisobutylene-based polyurethane networks

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Summary

Polyisobutylene-based polyurethane networks have been synthesized by crosslinking polyisobutylene glycols with tri-phenylmethane triisocyanate and their gas permeability, water absorption, hydrolytic stability, and air oven aging characteristics was examined by ASTM methods. The preparation of the polyurethane sheets is described. The oxygen permeability of polyisobutylene-based polyurethanes is lower than that of vulcanized butyl rubber and their water absorption is negligible. The hydrolytic stability of these new polyurethanes is outstanding and their mechanical properties (tensile strength, modulus, elongation) remain practically unchanged after four days of exposure to 85° steam. Similarly, air aging for two days at 128° affects little mechanical properties.

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References

  • DOYLE, E. N.: “The Development and Use of Polyurethane Products”, McGraw-Hill, N.Y., 1971, p. 97

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  • KENNEDY, J. P., IVAN, B. and CHANG, V.S.C., in “Urethane Chemistry and Applications”, Ed., EDWARDS, K. N., ACS Symp. Ser., 172, 383 (1981)

  • POLYSAR BUTYL HANDBOOK, Ryerson Press, Toronto, Canada, 1966, p. 319, 324, 345

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Authors and Affiliations

  1. Institute of Polymer Science, The University of Akron, 44325, Akron, OH, USA

    Victor S. C. Chang & Joseph P. Kennedy

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  1. Victor S. C. Chang
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  2. Joseph P. Kennedy
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Chang, V.S.C., Kennedy, J.P. Gas permeability, water absorption, hydrolytic stability and air-oven aging of polyisobutylene-based polyurethane networks. Polymer Bulletin 8, 69–74 (1982). https://doi.org/10.1007/BF00263010

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  • DOI: https://doi.org/10.1007/BF00263010

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