Synthesis, characterization and biodegradation studies of polyurethanes: Effect of unsaturation on biodegradability
| Autor: | Manuel Burelo, Itzel Gaytán, Herminia Loza-Tavera, Jorge A. Cruz-Morales, Daniel Zárate-Saldaña, M. Javier Cruz-Gómez, Selena Gutiérrez |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Polymers Health Toxicology and Mutagenesis Polyesters Polyurethanes Public Health Environmental and Occupational Health Carboxylic Acids Fungi Biocompatible Materials General Medicine General Chemistry Pollution Biodegradation Environmental Environmental Chemistry Cladosporium |
| Zdroj: | Chemosphere. 307(Pt 4) |
| ISSN: | 1879-1298 |
| Popis: | The presence of unsaturation in the main chain of the polymer promotes the biodegradation process. To elucidate this hypothesis, one unsaturated polyurethane (PUU) and another saturated polyurethane (PUS) were synthesized and then biodegraded, and evidence was found to support this hypothesis. The polyurethanes were synthesized by a polycondensation reaction with yields up to 97%. It is important to note that both polyurethanes were constituted only by the recalcitrant hard segment and showed low crystallinity and molecular weight. Spectroscopic, thermal, and chromatographic techniques were used for physical and structural characterization. Both polyurethanes were biodegraded by the BP8 microbial community and the Cladosporium tenuissimum A3.I.1 fungus during a two-month period. A postbiodegradation characterization revealed the detriment of properties in both materials, indicating successful biodegradation. As a general trend, more efficient biodegradation was observed by the Cladosporium tenuissimum fungus A3.I.1 than by the BP8 microbial community. Specifically, with the fungus, the infrared analysis showed a decrease in the characteristic bands as well as the appearance of new carboxylic acid signals (approximately 1701 cm |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect