Synthesis of smart dual-responsive microgels: correlation between applied surfactants and obtained particle morphology.

Synthesis of smart dual-responsive microgels: correlation between applied surfactants and obtained particle morphology.
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智能双响应微凝胶的合成:应用的表面活性剂与获得的颗粒形态之间的相关性

DOI:
10.1039/c9sm00690g
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发表时间:
2019
期刊:
影响因子:
3.4
通讯作者:
T. Hellweg
T. Hellweg
中科院分区:
化学2区
文献类型:
--
作者:
L. Wiehemeier;T. Brändel;Y. Hannappel;T. Kottke;T. Hellweg

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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.
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