Maiti, Binoy and Nandi, Mridula and Bonardd, Sebastian and Franco, Lourdes and Puiggali, Jordi and Enshaei, Hamidreza and Aleman, Carlos and Diaz Diaz, David (2021) Efficient One-Pot Preparation of Thermoresponsive Polyurethanes with Lower Critical Solution Temperatures. CHEMPLUSCHEM, 86 (12). pp. 1570-1576. ISSN 2192-6506,
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This work reports a simple and scalable strategy to prepare a series of thermoresponsive polyurethanes synthesized via copolymerization of dicyclohexyl diisocyanate with glycerol ethoxylate in a single one-pot system. These polyurethanes exhibit lower critical solution temperatures (LCST) at 57 degrees C. The LCST of synthesized polyurethane was determined from Dynamic Scanning Calorimetry and UV-vis measurements. Both the LCST and T-g of synthesized polyurethane was tuned by varying the ratio between hard segment (dicyclohexyl diisocyanate) and soft segment (glycerol ethoxylate). Thus, T-g values could be tuned from -54.6 degrees C to -19.9 degrees C for samples with different flexibility. The swelling and deswelling studies were done at room temperature and above the LCST respectively. The results showed that the swelling ratio increases with the increase of soft segment (glycerol ethoxylate) in synthesized polyurethanes. Furthermore, the mechanical properties of the membrane were studied by universal tensile testing measurements. Specifically, stress at break values varied from 0.35 +/- 0.07 MPa to 0.91 +/- 0.15 MPa for the tested membranes, whereas elongation at break data ranged from 101.9 +/- 20.9 % to 192.4 +/- 24.4 %, and Young's modulus varied from 0.35 +/- 0.03 MPa to 1.85 +/- 0.19 MPa. Tensile strength of the films increased with the increase of the hard segment and elongation at break decreased.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | BIODEGRADABLE POLYURETHANES; SOLVENT-FREE; POLYMERS; GLYCOL); copolymerization; critical solution temperatures; polyurethanes; tensile strength; thermoresponsive materials |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Organische Chemie > Arbeitskreis Prof. Dr. David Díaz Díaz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Sep 2022 07:38 |
| Last Modified: | 14 Sep 2022 07:38 |
| URI: | https://pred.uni-regensburg.de/id/eprint/47420 |
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