Synthesis of smart dual-responsive microgels: correlation between applied surfactants and obtained particle morphology
- 21 June 2019
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Soft Matter
- Vol. 15 (28) , 5673-5684
Abstract
Thermo- and pH-responsive copolymer microgels were obtained by surfactant-assisted precipitation polymerization of N-isopropylacrylamide (NIPAM) and acrylic acid (AAc). The surfactants used were sodium dodecylsulfate (SDS), dodecyltrimethylammonium bromide (DTAB) and the nonionic n-octyl-β-D-glucopyranoside (C8G1). We investigate the influence of the surfactants on the acrylic acid incorporation rate, the particle size, particle morphology, and the swelling behaviour at pH 4 and pH 7, at which AAc is neutral or charged, respectively. It is shown that each surfactant has a specific influence, which is connected to its role in the polymerization mechanism and its charge. A combined FTIR and PCS study reveals that the particles undergo a temperature-induced change in microstructure, even if the particle hydrodynamic radius does not change significantly.Keywords
Funding Information
- Deutsche Forschungsgemeinschaft (HE2995/6-1, INST215/444-1, KO3580/4-2)
This publication has 70 references indexed in Scilit:
- Thermo- and light-regulated fluorescence resonance energy transfer processes within dually responsive microgelsPolymer Chemistry, 2010
- Preparation of Hybrid Microgels Functionalized by Silver NanoparticlesMacromolecular Rapid Communications, 2006
- Solvent relaxation of swelling PNIPAM microgels by NMRColloids and Surfaces A: Physicochemical and Engineering Aspects, 2005
- ATR-FTIR Spectroscopic Study on Hydrogen Bonding of Poly(N-isopropylacrylamide-co-sodium acrylate) GelMacromolecules, 2005
- Conformational Change of Poly(N-isopropylacrylamide) during the Coil−Globule Transition Investigated by Attenuated Total Reflection/Infrared Spectroscopy and Density Functional Theory CalculationThe Journal of Physical Chemistry A, 2001
- Changes in the Hydration States of Poly(N-n-propylmethacrylamide) and Poly(N-isopropylmethacrylamide) during Their Phase Transitions in Water Observed by FTIR SpectroscopyMacromolecules, 2001
- Influence of charge density on the swelling of colloidal poly(N-isopropylacrylamide-co-acrylic acid) microgelsColloids and Surfaces A: Physicochemical and Engineering Aspects, 2000
- Light scattering study of spherical poly(N-isopropylacrylamide) microgelsJournal of Macromolecular Science, Part B, 1997
- Structure of Liquid Water Determined from Infrared Temperature Profiling and Evolutionary Curve ResolutionJournal of the American Chemical Society, 1994
- CONTIN: A general purpose constrained regularization program for inverting noisy linear algebraic and integral equationsComputer Physics Communications, 1982