Accession Number:

ADA128882

Title:

Synthesis and Characterization of Free Radical Cured Bis-Methacryoxy Bisphenol-A Epoxy Networks.

Descriptive Note:

Interim rept. Apr 82-Jan 83,

Corporate Author:

VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG

Report Date:

1983-02-01

Pagination or Media Count:

25.0

Abstract:

Synthesis ad free-radical curing reactions of the bis-glycidylmethacrylate of bisphenol-A Bis-GMA were investigated. Bis-GMA resin was synthesized by reacting Epon 825 with methacrylic acid, followed by characterization using IR and NMR spectroscopy. Various modifiers having reactive double bonds were co-cured with the methacryloxy resins, using a free radical initiator. The networks obtained were compared with a cycloaliphatic amine cured epoxy network. Thermal characterization shows that methacryloxy cured systems are more resistant to mechanical penetration and have higher glass transition temperatures and better stability to thermal decomposition as compared with the conventional diamine cured epoxy networks. Dynamic mechanical experiments and stress-strain tests also indicate that Bis-GMA based networks have higher tensile moduli and lower elongation at break. Using different modifiers such as 2-ethyhexyl acrylate, the tensile and impact properties of the networks can be improved. Author

Subject Categories:

  • Organic Chemistry
  • Plastics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE