PERFORMANCE OF URETHANE VULCANIZATES IN ENVIRONMENTS OF HIGH HUMIDITY

Abstract

Polyester urethane elastomeric end items have exhibited severe breakdown after service periods of as little as one to two years. The rubber becomes tar-like within an unreasonably brief period of service and is rendered unfit for further use. Duplication of this rubber failure under laboratory conditions was accomplished by exposing specimens over water at 158 F and at room temperature. Two modes of degradation appear to occur simultaneously and independently of one another; i.e., hydrolysis or chain scission of specimens exposed at 158 F and microorganism attack of the specimen at room temperature accompanied by hydrolysis. A polycarbodiimide and pentachlorophenol demonstrate their ability to retard chain scission and microor.anism attack, respectively. Unfortunately, pentachlorophenol interferes somewhat with the efficiency of the polycarbodiimide when the two materials are used in admixture. Polyether urethane vulcanizates, containing no special additives, are not adversely affected by environmencs of high humidity.

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Document Details

Document Type
Technical Report
Publication Date
Aug 30, 1963
Accession Number
AD0422028

Entities

People

  • Frank B. Testroet

Tags

Communities of Interest

  • Biomedical
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Aluminum Oxides
  • Biomedical And Dental Materials
  • Chemistry
  • End Items
  • Environment
  • High Humidity
  • Jet Propulsion
  • Laboratory Tests
  • Materials
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Military Research
  • Physical Properties
  • Polymeric Films
  • Weapons

Readers

  • Applied Combinatorial Optimization and Logic Circuit Design.
  • Polymer Science and Engineering.