US EPA

1181616 

Journal Article 

Synthesis of IPN polymer hybrids by in-situ radical polymerization method and their high resistivity to solvent extraction 

Tamaki, R; Horiguchi, T; Chujo, Y 

1998 

Yes 

Bulletin of the Chemical Society of Japan
ISSN: 0009-2673
EISSN: 1348-0634 

CHEMICAL SOC JAPAN 

TOKYO 

71 

12 

2749-2756 

English 

10.1246/bcsj.71.2749 

WOS:000077729400002 

https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032411909&doi=10.1246%2fbcsj.71.2749&partnerID=40&md5=a0ed848cd8a2dac6954b77a436eeddee
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Two different types of polymer hybrids having an interpenetrating polymer network (IPN) of the organic gel and silica gel were prepared by the in-situ polymerization method. One type is the IPN polymer hybrids of poly(N,N'-dimethylacrylamide) gel and silica gel that were prepared by simultaneous polymerization of N,N'-dimethylacrylamide and N,N'-methylenebisacrylamide in a methanol solution of tetramethoxysilane (TMOS). The other type is IPN polymer hybrids of polystyrene gel and silica gel that were prepared by the polymerization of styrene monomer in the presence of divinylbenzene and TMOS. Radical polymerization of these organic monomers proceeded effectively in the sol-gel reaction mixture of TMOS, resulting in homogeneous glassy materials. The formation of TPN structure was confirmed by the solvent extraction. The loss of organic elements could be prevented in both cases by the incorporation of cross-linking points in the organic network. The homogeneity of these IPN polymer hybrids were supported by nitrogen porosimetry measurements. The results demonstrated that the porous silicas obtained from the polymer hybrids had high surface areas and large pore volumes and exhibited a sharp distribution of pore size below 2 nm in both types of IPN polymer hybrids. These results indicate a molecular-level integration of the organic gel and silica gel in the IPN polymer hybrids.