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- W2027676829 abstract "The mean-square dipole moment per repeating unit, 〈μ2〉/x, of the semialiphatic poly(imide−ester) prepared by condensation of N-(4-carboxyphenyl)trimellitimide acid and diethylene glycol (PIEDEG) was measured at several temperatures in a dioxane solution. The value of 〈μ2〉/x was 12.70 D2 at 30 °C, and the temperature coefficient expressed in terms of d(ln 〈μ2〉)/dT was lower than 1 × 10-4 K-1. For comparative purposes, the mean-square dipole moment of N-[4-[(decyloxy)carbonyl]phenyl]-4-[(decyloxy)carbonyl]phthalimide (NDDPT), a model compound of the acid residue, was also measured in dioxane solutions and found to be 11.63 D2 at 30 °C. MD simulations, employing the Amber force field, were used to study the conformational characteristics of NDDPT. These results, in combination with the conformational energies of the flexible residue, permitted a preliminary characterization of the statistics of the chains. Owing to the asymmetry of the acid residue, PIEDEG is a random copolymer of A and B units. The influence of both the distribution of these units and the number of repeating units on the polarity of the poly(ester−imide) is discussed. In general, reasonable agreement between theory and experiment is found. The lack of a strong correlation between the θ angles formed by successive rods in the melt may be responsible for the fact that the poly(imide−ester) used in this study does not develop mesomorphic order." @default.
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- W2027676829 date "1998-02-24" @default.
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- W2027676829 title "Polarity and Conformational Characteristics of Semialiphatic Poly(imide−ester)s" @default.
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- W2027676829 doi "https://doi.org/10.1021/ma9708196" @default.
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