THE EFFECT OF EPOXY RESIN AND CURING AGENT STRUCTURE ON ABLATIVE PROPERTIES.
Interim rept., Jul 64-Jul 65,
NAVAL ORDNANCE LAB WHITE OAK MD
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The reported is the second phase of a correlation of the chemical and physical properties of a polymer with its ablative properties See AD-467 049 for phase I. Epoxide resins and curing agents were employed as model systems. Thermogravimetric analysis, cross-link density studies, infrared spectroscopy and alpha-rod testing in the oxyacetylene burner facility were employed in the evaluation of the various systems. Amine cured epoxide structures produced high char rates 7.1 to 21.0 milssec and low times to 200C 33 to 47 sec. Certain anhydride cured epoxides, namely methyl bicyclo 2.2.1 heptene-2,3-dicarboxylic anhydride NMA and 3,3,4,4-benzophenone tetracarboxylic dianhydride BTCD were found to give good performance with low char rates 2.2 to 5.0 milssec and high times to 200C 91 to 101 sec. Epoxides with a polyphenyl backbone gave the best overall performance, although resorcinol diglycidyl ether performed well also. Resin purity was found to be fairly critical in regard to ablative performance. Author
- Polymer Chemistry