Journal article
Preparation and characterization of comb-shaped polyesters from 2,2-dioctadecyl-1,3-propanediol and phthalic acids
New types of comb-shaped polyesters have been prepared by transesterification of 2,2-dioctadecyl-1,3-propanediol and the three isomeric diphenyl phthalates. Intrinsic viscosity and SEC analyses allowed determination of DPs (60–89) and molar masses; results compare well with absolute average weight molar masses (56,000–118,000) determined by low-angle laser light scattering.
High-resolution 13C NMR reveals the characteristic aromatic and glycol polyester patterns; it resolves many side-chain methylene carbons, but shows no evidence of end-groups. All the polyesters are crystalline as shown by X-ray diffractometry and DSC, the crystallinity being exclusively due to the octadecyl side-group crystallization in the hexagonal form.
The results indicate that the crystallinity decreases substantially when going from the ortho- to the terephthalate polyester.
Language: | English |
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Publisher: | Springer-Verlag |
Year: | 1991 |
Pages: | 23-29 |
ISSN: | 14362449 and 01700839 |
Types: | Journal article |
DOI: | 10.1007/BF00299344 |