2026-04-13T04:00:53Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1827792025-12-05T14:18:12Zcom_2072_1057col_2072_478902col_2072_478917

00925njm 22002777a 4500 dc Maiti, Binoy author Nandi, Mridula author Bonardd, Sebastian author Franco, Lourdes author Puiggalí, Jordi author Enshaei, Hamidreza author Aleman, Carlos author Díaz Díaz, David author 2022-01-28T11:53:11Z 2022-01-28T11:53:11Z 2021-12-01 2022-01-28T11:13:46Z 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. Poliuretans Glicols Polyurethanes Glycols Efficient One-Pot Preparation of Thermoresponsive Polyurethanes with Lower Critical Solution Temperatures