Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 114, Issue 1, Pages 402-406Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2008.09.046
Keywords
Composite materials; Chemical synthesis; Ultrasonic techniques; Microstructure
Categories
Funding
- China Postdoctoral Science Foundation [20060400954]
- Jiangsu Planned Projects for Postdoctoral Research Funds [0602027B]
- Key Laboratory of Organic Chemistry of jiangsu Province
Ask authors/readers for more resources
The controlled graft modification of silica gel has been achieved by RAFT polymerization under ultrasonic irradiation. Silica gel was first dispersed in dry toluene under ultrasonic irradiation, and then reacted with 3-aminopropyldimethylethoxylsilane (KH550), and subsequently with S-1-dodecyl-S'-(alpha,alpha'-dimethyl-alpha ''-acetic acid)trithiocarbonate (DDACT) to serve as RAFT agent. The graft polymerization of methyl acrylate was carried out under ultrasonic irradiation (59 kHz, 90 W). The poly(methyl acrylate) (PMA) grafted silica gel was characterized by Fourier transform infrared spectrometry (FT-IR), field-emitting scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The results show that the graft polymerization was well controlled by the RAFT process, and the PMA modified silica gel particles were synthesized successfully. The graft content could reach 32% within 6 h though there was an inhibition of about 50 min in the graft polymerization. Each silica gel particle was coated with an outer layer of PMA chains, and no aggregation was detected in the SiO(2)-g-PMA dispersion. This work indicated that ultrasonic initiated RAFT polymerization can be a method to modify silica gel with well-defined graft polymers. (c) 2008 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available