A viscometric study of dilute solutions of low-molecular-weight unsaturated polyesters

✍ Scribed by A. Kaštánek; M. Bohdanecký

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 340 KB
• Volume: 21
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(85)90207-1

✦ Synopsis

The intrinsic viscosities (in methyl ethyl ketone at 2Y') of 19 fractions of an unsaturated polyester (prepared from ethane diol, maleic and phthalic anhydrides in the mole ratio 1:0.4:0.6) have been determined and correlated with the number-and weight-average molecular weights (390 _< ~t _< 5 × 103). The theory of intrinsic viscosity developed for the worm-like chain model has been used to evaluate parameters characterizing the conformation of the chain (e.g. the characteristic ratio of unperturbed chain dimensions, the Kuhn statistical segment length, the effective hydrodynamic diameter, etc.). A comparison with unsaturated hexane diol polyesters indicates a higher degree of rotational freedom of chains containing ethane diol units.