Preparation of unsaturated polyesters using boric acid as mild catalyst and their sulfonated derivatives as new family of degradable polymer surfactants


Alemdar N., Erciyes A. T. , BICAK N.

POLYMER, cilt.51, ss.5044-5050, 2010 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 51 Konu: 22
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1016/j.polymer.2010.08.066
  • Dergi Adı: POLYMER
  • Sayfa Sayıları: ss.5044-5050

Özet

Boric acid-pyridine mixture is presented as mild catalyst for polycondensation of semi-esters of ethylene glycol, in situ-generated by "cyclic anhydride diol" reaction scheme from maleic, succinic and phthalic anhydrides. This catalyst system was demonstrated to give colorless polyesters in low molecular weights (Mn: 1650-1950 Da) within 4 h at 130 degrees C (1)H NMR spectra of the polyesters derived from maleic anhydride revealed significant isomerization of maleate groups to fumarate units (80 %) during the polyesterification. Maleate and fumarate double bonds of the unsaturated polyesters (USP) were demonstrated to add bisulfite ions quantitatively to give sulfonated polyesters. The resulting sulfonated polyesters with 50% and 70% succinate units exhibited relatively narrow size spherical and ellipsoidal micelles in aqueous solutions, as inferred from surface tension, DLS and ESEM measurements. The results showed that, this procedure allows preparing a new family of polymer surfactants with tunable hydrophilicity and degradable polyester backbones. (C) 2010 Elsevier Ltd. All rights reserved.