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Citation: GAO Xue-Chao, GAO Bao-Jiao. Preparation of Grafting-Type Functional Composite Particles of Polyamidoxime/SiO₂[J]. Chinese Journal of Applied Chemistry, ;2010, 27(3): 313-317. doi: 10.3724/SP.J.1095.2010.90269 shu

Preparation of Grafting-Type Functional Composite Particles of Polyamidoxime/SiO₂

Department of Chemical Engineering, North University of China, Taiyuan 030051

Received Date: 9 April 2009
Revised Date: 15 June 2009

Micron-sized silicon particles were chemically surface-modified with coupling agent KH₅70,and the grafted particles PAN/SiO₂ were obtained.The graft polymerization of acrylonitrile(AN) on the surfaces of particles PAN/SiO₂ was performed in a solution polymerization system.The transformation reaction of nitrile groups of the grafted PAN to amidoxime groups(AO) was conducted with hydroxylamine hydrochloride as reagent in the presence of Na₂CO₃,resulting in functional composite particles of PAO/SiO₂,on which poly(amidoxime) macromolecules were chemically anchored.The two kinds of particles were characterized with FTIR,TGA and SEM methods.The effects of the main factors on the graft polymerization of AN and on the amidoxime transformation reaction of the grafted PAN were examined.The experimental results show that in the graft polymerization process,the suitable amount of initiator used is 1.5% of monomer mass,and the appropriate reaction temperature is 75℃.As the graft polymerization is carried out for 5 h under the proper conditions,the grafted particles PAN/SiO₂ with a grafting degree of 0.14 g/g can be obtained.The amidoxime transformation reaction can not be carried out completely due to the steric hindrance of amidoxime groups.The optimal reaction conditions for the amidoxime transformation reaction of the grafted PAN are as follows:pH value in a range of 6~7,reaction temperature 70℃ and reaction time 4 h.Under the appropriate conditions,the functional particles of PAO/SiO₂ with a nitrile group conversion ratio of 78% can be obtained.
- acrylonitrile,
- graft polymerization,
- poly(amidoxime),
- silica gel,
- functional particle
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Preparation of Grafting-Type Functional Composite Particles of Polyamidoxime/SiO₂