✦ LIBER ✦

Synthesis, characterization, and thermal and dielectric properties of three different methacrylate polymers with zwitterionic pendant groups

✍ Scribed by J. Cardoso; R. Manrique; M. Albores-Velasco; A. Huanosta

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 216 KB
Volume: 35
Category: Article
ISSN: 0887-6266
DOI: 10.1002/(sici)1099-0488(199702)35:3<479::aid-polb7>3.0.co;2-n

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✦ Synopsis

SYNOPSIS

The synthesis, characterization, thermal, and dielectric properties of three different zwitterionic methacrylates of the sulfobetaine type are presented. Diethylamine-ethyl-, 2-(diethylaminoethoxy)-ethyl-, and 2-(2-diethylaminoethoxy) ethoxy)-ethyl-methacrylates were made to react with butanosultone to prepare monomers with variable flexibility. The flexibility of the lateral chain of the polymethacrylates decreased the glass transition temperature ( T g down to 300 K) of the polymers. A linear relationship between T g and the number of carbon atoms was shown for these materials. X-ray diffraction and DSC experiments showed the formation of new ordered phases in these polymers, which inhibited their dipole conductivity. On heating, these phases were destroyed and values of conductivity of 10 07 -10 03 S cm 01 were obtained in the studied range of temperature. Variation of conductivity with temperature was established according to the Arrhenius equation. Dielectric properties exhibited a small deviation of the Debye type behavior, and b parameters of the Cole-Cole equations were calculated for the synthesized polymers. ᭧ 1997 John Wiley & Sons, Inc. Keywords: polyzwitterions, synthesis of j dielectric properties j thermal properties on poly(zwitterions) j morphology of polyzwitterions * To whom correspondence should be addressed.

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