Urethane Foams for Aerospace Application
Abstract
Preliminary tests of one-part frozen urethane powders exposed in a high-altitude vacuum chamber operated at temperatures of -50 degrees and 70 degrees F have shown that a new group of triol-free branched polymers, esterified short of the critical degree of esterification, are capable of producing rigid foams with strength properties comparable to those obtained by high-temperature curing at atmospheric pressure. Controlled, reduced temperature, premixing of three categories of several two-part urethane systems, before rapid freezing in liquid nitrogen, was considered a significant factor in trapping sufficient exotherm of isocyanate cross-linking reactions to initiate foaming in a low-temperature and vacuum environment.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 02, 1962
- Accession Number
- AD0273874
Entities
People
- H.r. Moore
Organizations
- Naval Air Warfare Center Warminster