High Energy Binders.
Quarterly letter no. 2, 1 Mar-31 May 83.
MORTON THIOKOL INC BRIGHAM CITY UT WASATCH DIV
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Research efforts have continued in the areas of monomer synthesis, including non-energetic monomers for the thermoplastic elastomers, polymer synthesis, and polymer characterization. Also initiated were the determination of reactivity ratios of new monomers and the thermal depolymerizationdecomposition of polyethers by thermogravimetric analysis. Two new monomers were synthesized during this reporting period for use in imparting internal plasticization to polyTHF. The first, 3-octoxymethyl-3-methyl-oxetane OMMO was readily prepared in high yield by the reaction of octyl bromide on the sodium salt of 3-hydroxymethyl-3-methyloxetane in dioxane. The second monomer, bismethoxyethoxy methyloxetane BMEMO was prepared by the action of bischloromethyloxetane on the sodium salt of methoxyethanol in excess methoxy-ethanol. Both monomers were isolated at 99 purity by vacuum distillation from sodium hydride. In order to develop thermoplastic elastomer with highly elastomeric properties, we have synthesized two new polymers based on polyTHF using OMMO and BMEMO as comonomers. Two polymers were prepared polyTHFOMMO and polyTHFBMEMO with a molecular weight of 20,000. Both polymers were found to have very low viscosity upon isolation and visually can be called internally plasticized. As time permits, each will be incorporated into a thermoplastic elastomer with polyBEMO as the crystalline block.
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