DSC and thermal stability investigation of novel poly(ester-ether) glycols and poly(ester-ether)urethanes
| Autor: | Adolf Balas, Janusz Datta |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
chemistry.chemical_classification
Materials science Adipic acid technology industry and agriculture Ether Condensed Matter Physics chemistry.chemical_compound Differential scanning calorimetry chemistry Polyol Polymer chemistry Thermal stability Physical and Theoretical Chemistry Glass transition Ethylene glycol Polyurethane |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 74:615-621 |
| ISSN: | 1388-6150 |
| Popis: | A new group of poly(ester-ether) glycols was obtained by polycondensation of adipic acid with poly(alkylene glycol) or of adipic acid with mixture of poly(alkylene glycol) and ethylene glycol. Poly(ester-ether) glycols were synthesised in a two-step method at comparable laboratory conditions. We prepared series of poly(ester-ether) glycols where molar ratios [COOH]:[OH] were changed in the range from 1:1.20 to 1:2.10. The molecular mass of synthesized substances was in the range from 850 to 2500 g mol-1. Thermal stability of poly(ester-ether) glycols and obtained polyurethanes was investigated by thermogravimetric analysis and DSC method. We have found that obtained oligomerols obtained from adipic acid and poly(tetramethylene glycol) have the highest thermal stability. The differential scanning calorimetry shown occurrence of two-phase transitions for examined polyurethanes, which are described by glass transition temperature T g and the melting temperature T t. |
| Databáze: | OpenAIRE |
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