NDLI: Preparation of high PMMA grafted particle SiO$_{2}$ using surface initiated free radical polymerization

Content Provider	Springer Nature Link
Author	Gao, Baojiao Li, Din Lei, Qingjuan
Copyright Year	2011
Abstract	In this work, a convenient surface-initiated free radical graft-polymerization method, by which polymethacrylic acid (PMAA) with a high grafting density was grafted on silica gel particles, was put forward, and it was feasible and effective. The coupling agent γ-aminopropyltrimethoxysilane (AMPS) was first bound onto the surfaces of silica gel particles, obtaining the modified particles AMPS-SiO$_{2}$. So a redox initiation system was constituted with the amino groups on the surfaces of AMPS-SiO$_{2}$ particles and ammonium persulphate in the solution. A great deal of primary free radicals on the surfaces of AMPS-SiO$_{2}$ particles is produced via the redox initiating reaction, so that the surface-initiated free radical graft- polymerization of methacrylic acid (MAA) on the silica gel particles was realized, giving the grafted particles PMAA/SiO$_{2}$ with a high grafting degree (about 30 g/100 g) of PMAA. The effects of the main factors on the surface initiated graft polymerization were examined and the corresponding mechanism was investigated in depth. The experimental results show that for this surface-initiated free radical graft-polymerization of MAA, the suitable temperature is 40 °C. If the temperature is over 40 °C, the graft polymerization will be affected negatively, and the grafting degree of PMAA will decline because of the intense heat decomposition of ammonium persulphate. During the graft polymerization, the grafted polymer layer that has formed is a hindrance to the subsequent graft polymerization. The used amount of initiator and the monomer concentration affect the graft polymerization greatly. The appropriate reaction conditions are as follows: reaction time of 10 h, initiator persulphate amount of 1.1% (it implies the mass percent of the monomer), and monomer MAA concentration of about 5% (it drives at the mass percent of the solution).
Starting Page	1519
Ending Page	1526
Page Count	8
File Format	PDF
ISSN	10229760
Journal	Journal of Polymer Research
Volume Number	18
Issue Number	6
e-ISSN	15728935
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-01-07
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Methacrylic acid Silica gel particles Redox initiation system Surface-initiated graft-polymerization Grafting degree Polymer Sciences Characterization and Evaluation of Materials Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Materials Chemistry Polymers and Plastics

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