Comb-Shaped Polyesters of Aliphatic Dicarboxylic Acids and 2-Octadecyl-1,3-Propanediol. I. 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...

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Bibliographic Details
Published in:Polymer (Guilford) 1991-01, Vol.32 (12), p.2294-2299
Main Authors: Andruzzi, F, Hvilsted, S
Format: Article
Language:English
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Summary: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 exp --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 exp 13 C 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. Graphs, Spectra. 20 ref.--AA
ISSN:0032-3861