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A comprehensive systematic study on thermoresponsive gels: beyond the common architectures of linear terpolymers

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Title: A comprehensive systematic study on thermoresponsive gels: beyond the common architectures of linear terpolymers
Authors: Constantinou, A
Zhao, H
McGilvery, C
Porter, A
Georgiou, T
Item Type: Journal Article
Abstract: In this study, seven thermoresponsive methacrylate terpolymers with the same molar mass (MM) and composition but various architectures were successfully synthesized using group transfer polymerization (GTP). These terpolymers were based on tri(ethylene glycol) methyl ether methacrylate (TEGMA, A unit), n-butyl methacrylate (BuMA, B unit), and 2-(dimethylamino)ethyl methacrylate (DMAEMA, C unit). Along with the more common ABC, ACB, BAC, and statistical architectures, three diblock terpolymers were also synthesized and investigated for the first time, namely (AB)C, A(BC), and B(AC); where the units in the brackets are randomly copolymerized. Two BC diblock copolymers were also synthesized for comparison. Their hydrodynamic diameters and their effective pKas were determined by dynamic light scattering (DLS) and hydrogen ion titrations, respectively. The self-assembly behavior of the copolymers was also visualized by transmission electron microscopy (TEM). Both dilute and concentrated aqueous copolymer solutions were extensively studied by visual tests and their cloud points (CP) and gel points were determined. It is proven that the aqueous solution properties of the copolymers, with specific interest in their thermoresponsive properties, are influenced by the architecture, with the ABC and A(BC) ones to show clear sol-gel transition.
Issue Date: 20-Jan-2017
Date of Acceptance: 16-Jan-2017
URI: http://hdl.handle.net/10044/1/44052
DOI: https://dx.doi.org/10.3390/polym9010031
ISSN: 2073-4360
Publisher: MDPI
Journal / Book Title: Polymers
Volume: 9
Issue: 1
Copyright Statement: © 2017 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Publication Status: Published
Open Access location: http://www.mdpi.com/2073-4360/9/1/31
Article Number: 31
Appears in Collections:Materials