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Preparation and characterization of thermosensitive core/shell microgels with carbon microsphere cores

Published online by Cambridge University Press:  12 May 2014

Lin Chen ,
Longfei Li ,
Weifeng Liu ,
Yongzhen Yang  and
Xuguang Liu
Lin Chen
Affiliation:
Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Ministry of Education, Taiyuan 030024, China; and Department of Applied Chemistry, College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Longfei Li*
Affiliation:
Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Ministry of Education, Taiyuan 030024, China; and College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Weifeng Liu*
Affiliation:
Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Ministry of Education, Taiyuan 030024, China; and Department of Applied Chemistry, College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Yongzhen Yang*
Affiliation:
Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Ministry of Education, Taiyuan 030024, China; and Research Center on Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China
Xuguang Liu*
Affiliation:
Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Ministry of Education, Taiyuan 030024, China; and Department of Applied Chemistry, College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
*
b)e-mail: yyztyut@126.com
a)Address all correspondence to these authors. e-mail: liuxuguang@tyut.edu.cn
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Abstract

A novel thermosensitive core/shell microgel with carbon microspheres (CMSs) cores was prepared by three steps. First, oxidized-carbon microspheres were obtained by mixed-acid oxidization. Second, the silane agent of 3-(trimethoxysilyl)-propyl methacrylate was used to functionalize the oxidized-carbon microspheres so as to generate the vinyl groups on the microspheres. Thereafter, the as-synthesized particles were used as seeds in the precipitation polymerization of N-isopropylacrylamide to introduce a thermosensitive polymer microgel shell onto the surfaces of the silanized-CMSs in the presence of an initiator and a crosslinker. The morphology and thermosensitive properties of the composite microspheres were characterized by field emission scanning electron microscopy, transmission electron microscopy, Fourier transformation infrared spectroscopy, thermogravimetry, and dynamic light scattering. Results indicate that the thickness of polymer layer could be adjusted by the crosslinking agent's concentration. The composite microgels had a low critical solution temperature at about 30 °C and exhibited strong thermosensitivity. The controlled release of a drug molecule (a model drug, acetosalicylic acid) was also investigated.

Keywords

core/shellchemical vapor depositionpolymerization
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 10 , 28 May 2014 , pp. 1153 - 1161
Copyright
Copyright © Materials Research Society 2014 

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