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Some poly(carboxybetaines) and their solution properties

Ş. RACOVIŢĂ1,* , A. ONU1, C. LUCA2

Affiliation

  1. “Al. I. Cuza” University, Faculty of Chemistry, 11 Carol I Bd., 700506 Iasi, Romania
  2. “Petru Poni” Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41 A, Iasi 700487, Romania

Abstract

A study on the viscometric behaviour of the three poly(carboxybetaines) based on poly(N-vinylimidazole) was performed. These poly(carboxybetaines) possess a space of one, two and three carbon atoms between quaternary ammonium group and carboxylate one, the last poly(carboxybetaine) containing the spacer with a side –CH3 group. From the study achieved was observed that poly(carboxybetaines) with one methylene group between the two oppositely charged groups is insoluble in water but it is soluble in saline media and exhibit an antipolyelectrolyte behaviour namely an increase of the viscosity with increasing salt concentration. The poly(carboxybetaine) with two methylene group between N+ and COO- is soluble both in water and aqueous salt solutions and with a mixed viscosimetric behaviour. Thus, the addition of salt (i.e., NaCl, CaCl2) leads to the decrease of the intrinsic viscosity but this decrease is greater in salt solutions of lower concentration. In contrast to the first two poly(carboxybetaine), that with three carbon atoms between N+ and COO- has a clearly polyelectrolyte behaviour..

Keywords

Poly(carboxybetaines), Zwitterionic polymers, Ionic polymers.

Submitted at: Feb. 6, 2007
Accepted at: July 15, 2007

Citation

Ş. RACOVIŢĂ, A. ONU, C. LUCA, Some poly(carboxybetaines) and their solution properties, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 7, pp. 2071-2074 (2007)