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2021-12-01

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cc by-nc (c) Maiti, Binoy et al, 2021
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/182779

Efficient One-Pot Preparation of Thermoresponsive Polyurethanes with Lower Critical Solution Temperatures

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https://doi.org/10.1002/cplu.202100451

Abstract

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.

Subject

Poliuretans, Glicols

Subject (English)

Polyurethanes, Glycols

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Articles publicats en revistes (Institut de Bioenginyeria de Catalunya (IBEC))

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MAITI, Binoy, et al. Efficient One-Pot Preparation of Thermoresponsive Polyurethanes with Lower Critical Solution Temperatures. Chempluschem. 2021. Vol.  vol 86, num. num 12, pags. 1570-1576. ISSN 2192-6506. [consulted: 10 of August of 2026]. Available at: https://hdl.handle.net/2445/182779

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