Studies on the synthesis and polymerization of 1,3-oxazines
- Los Alamos National Lab., NM (United States)
The synthesis of 2-substituted 1,3-oxazines and 1,3-oxazolines was accomplished by synthesizing the N-(2 or 3-chloroalkyl)amide followed by ring closure using 40% potassium fluoride on alumina. 2-phenyl-1,3-oxazine was studied to evaluate initiators, temperatures, and initiator ratios for the 1,3-oxazine polymerization. The monomer was purified by heating with sodium hydroxide for several hours, filtering, and vacuum distilling. Polymerizations were preferred without solvent at various temperatures and initiator ratios. The results indicate that 2-phenyl-1,3-oxazine polymerizes best at 140{degrees}C or higher. The initiators evaluated were: MeOTf, Me{sub 2}SO{sub 4}, Et{sub 3}OPF{sub 6}, MeI, benzyl iodide, and Et{sub 3}OSbCl{sub 6}. Of the initiators studied, dimethyl sulfate, triethyloxonium hexafluorophosphonate, and methyl trifluoromethanesulfonate were found to be adequate. Methyl trifluoromethanesulfonate gave the best results for polymer yield and inherent viscosity.
- OSTI ID:
- 141809
- Report Number(s):
- CONF-930304--
- Country of Publication:
- United States
- Language:
- English
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