Synthesis and properties of hydrophilic polymers. Part 7. Preparation, characterization and metal complexation of carboxy-functional polyesters based on poly(ethylene glycol)
✍ Scribed by Tülü, M; Geckeler, K E
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 107 KB
- Volume
- 48
- Category
- Article
- ISSN
- 0959-8103
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✦ Synopsis
Novel water-soluble polyesters with pendant carboxylic groups were synthesized by polycondensation of ethylenediaminetetra-acetic acid (EDTA) dianhydride and diethylenetriaminepenta-acetic acid (DTPA) dianhydride with poly(ethylene glycol)s of different chain-lengths. Two experimental approaches (polycondensation using various solvents and in the melt) were studied, and melt condensation was found to give higher yields of polyesters. The polymeric products were soluble in water, acetone, chloroform and toluene, and were characterized by elemental analysis, IR and NMR spectroscopy. In addition, the carboxyl functionalities were determined by titration and the hydrolytic stability studied as a function of pH. The complexing capacity of the functional polyesters was determined in dependence of pH for copper in aqueous solution using the Liquid-Phase Polymer-Based Retention (LPR) technique and found to be 257 mg g À1 for the EDTA-based copolymer at pH 5 and 230 mg g À1 for the DTPA-based copolymer, respectively.