Journal article
Comb-shaped polyesters of aliphatic dicarboxylic acids and 2-octadecyl-1,3-propanediol: 1. Synthesis and microstructure
Comb-shaped polyesters are prepared by polytransesterification of 2-octadecyl-1,3-propanediol and diphenyl suberate, sebacate, dodecanedioate, tetradecanedioate and hexadecanedioate in turn. The developed melt polycondensation procedure generally results in polyesters with intrinsic viscosities in the range 0.76-1.28 dl g-1.
High performance size exclusion chromatography reveals symmetrically shaped traces with peak maxima corresponding to molecular masses in the range 48 000-65 000 by use of the universal calibration. These molecular masses equivalent to degrees of polymerization, 97-124, can be shown to result from total functional group conversions > 98.5%.
Detailed C-13 nuclear magnetic resonance investigations of polyester solutions reveal many structural features originating from both main- and side-chain carbons and point to lack of stereoregularity. Infra-red spectra of polyesters reveal characteristic polyester absorption bands including bands indicative of the existence of a crystalline phase.
Language: | English |
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Year: | 1991 |
Pages: | 2294-2299 |
ISSN: | 18732291 and 00323861 |
Types: | Journal article |
DOI: | 10.1016/0032-3861(91)90062-N |