RT info:eu-repo/semantics/article
T1 Thermoresponsive Shape-Memory Hydrogel Actuators Made by Phototriggered Click Chemistry
A1 Maiti, Binoy
A1 Abramov, Alex
A1 Franco, Lourdes
A1 Puiggalí, Jordi
A1 Enshaei, Hamidreza
A1 Alemán, Carlos
A1 Díaz Díaz, David
K1 hydrogels
K1 membranes
K1 photoclick
K1 polymers
K1 shape-memory
K1 thermoresponsive
K1 hidrogeles
K1 membranas
K1 polímeros
AB This article describes the design and synthesis of a new series of hydrogelmembranes composed of trialkyne derivatives of glycerol ethoxylate andbisphenol A diazide (BA-diazide) or diazide-terminated PEG600 monomer viaa Cu(I)-catalyzed photoclick reaction. The water-swollen hydrogel membranesdisplay thermoresponsive actuation and their lower critical solution temperature(LCST) values are determined by differential scanning calorimetry. Glycerolethoxylate moiety serves as the thermoresponsive component and hydrophilicpart, while the azide-based component acts as the hydrophobic comonomerand most likely provides a critical hydrophobic/hydrophilic balance contributingalso to the significant mechanical strength of the membranes. These hydrogelsexhibit a reversible shape-memory effect in response to temperature througha defined phase transition. The swelling and deswelling behavior of themembranes are systematically examined. Due to the click nature of the reaction,easy availability of azide and alkyne functional-monomers, and the polymerarchitecture, the glass transition temperature (Tg) is easily controlled throughmonomer design and crosslink density by varying the feed ratio of differentmonomers. The mechanical properties of the membranes are studied byuniversal tensile testing measurements. Moreover, the hydrogels show the abilityto absorb a dye and release it in a controlled manner by applying heat below andabove the LCST.
PB Wiley
YR 2020
FD 2020
LK http://riull.ull.es/xmlui/handle/915/21294
UL http://riull.ull.es/xmlui/handle/915/21294
LA en
NO Universität Regensburg
DS Repositorio institucional de la Universidad de La Laguna
RD 27-dic-2024