Abstract
The configurational characteristics of poly(oxy-1,1-dimethylethylene) (PODME) were estimated by calculation based on the information acquired through the dipole moment and NMR analyses of 1,2-dimethoxy-2-methylpropane, and, in part, of PODME as presented in the preceding papers. By using the set of conformational energy parameters so established,, the characteristic ratio ‹r2›0/nl2 and the dipole moment ratio ‹μ2›/nm2 were evaluated. These results were compared with those for poly(oxyethylene) and poly(oxypropylene) studied previously. The configurational entropy calculated for the temperature equivalent to the melting point (175°C) of the polymer is 4.1 cal mol−1 deg−1. It was pointed out that a fairly large value of the enthalpy of fusion should be required to explain this comparatively high melting temperature of PODME, unless the correction term for the entropy of fusion emerging from the volume change on melting is very small.
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