FILAMENT-WINDING PLASTICS. PART 5 - EPOXY-AMINE REACTIONS AND THE PRACTICAL USE OF HIGH-STRENGTH PLASTICS
Abstract
The plastics formed when epoxy resins react with polyfunctional amines have extremely complex molecular structures. Except for the basic reactions of simple epoxies, little is known regarding the molecular structures of such materials. Hence probable structures for certain molecular regions of the cured plastics must be deduced from known structures of simple analogs. In this work some relatively simple epoxy-amine systems were studied to obtain information regarding isomers, reaction sequences, and rates which are likely to prevail in complex polymerizations. The major reaction process of coreacting amines is an additive coupling. Gas chromatography and nuclear magnetic resonance were used to determine which of some possible isomers were formed in the reactions studied. Aromatic amines are not as reactive as aliphatic amines at moderate temperatures. Reaction rate and reaction temperature affect the properties of the resulting plastic. Proper conditions allow the production of a partially polymerized resin syrup of high-strength epoxies with reduced monomer content. When MABA is used as a curing agent, the reactions can be stopped when a suitable viscosity is reached for wet winding or preimpregnation of the reinforcement fibers.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 10, 1968
- Accession Number
- AD0670483
Entities
People
- James R. Griffith
- Mary E. Mcgraw
Organizations
- United States Naval Research Laboratory