Development of Castor-Oil-Resistant Polyurethane Sonar Encapsulants.

Abstract

Polyurethanes have been widely used as underwater acoustic encapsulants for over twenty years. This research was designed to produce a polyurethane encapsulant that is nonhazardous and non-proprietary for use in castor-oil-filled systems. Seven commercial diamines were evaluated as replacements for methylene bis(2-chloroaniline)(MBOCA) in the cure system. The polyurethane produced were screened according to their handling properties, strength, modulus retention on water and castor oil exposure, electrical properties, and sound speed. The final candidates are commercial Toluene Diisocyanate/ Polyoxytetramethylene glycol prepolymers cured with diamine/diol/catalyst system. The resulting polyurethanes exhibit better combined castor oil and water resistance than any commerically available material. Originator supplied keywords include: Sonar transducer encapsulants.

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Document Details

Document Type
Technical Report
Publication Date
Jun 30, 1985
Accession Number
ADA157576

Entities

People

  • Callie M Thompson
  • W. T. Maurice

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Biomedical And Dental Materials
  • Chemical Synthesis
  • Chemistry
  • Electrical Properties
  • Failure Mode And Effect Analysis
  • Materials
  • Materials Science
  • Mechanical Properties
  • Physical Properties
  • Plant Oils
  • Plastic Explosives
  • Plastics
  • Polymer Degradation
  • Polymers
  • Polyurethanes
  • Resistance
  • Sonar Transducers

Readers

  • Polymer Science and Engineering.