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Studies on Porous Monolithic Materials Prepared via Sol–Gel Processes pp 13–32Cite as

Pore Formation in Poly(divinylbenzene) Networks Derived from Organotellurium-Mediated Living Radical Polymerization

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Abstract

Macroporous cross-linked polymeric dried gels have been obtained by inducing phase separation in a homogeneous poly(divinylbenzene) (PDVB) network formed by organotellurium-mediated living radical polymerization (TERP). The living polymerization reaction of DVB with the coexistence of a non-reactive polymeric agent, poly(dimethylsiloxane) (PDMS), in a solvent, 1,3,5-trimethylbenzene (TMB) resulted in polymerization-induced phase separation (spinodal decomposition), and the transient structure of spinodal decomposition has been “frozen” by gelation. Well-defined macroporous monolithic dried gels with bicontinuous structure in the micrometer scale are obtained after removing PDMS and TMB by simple washing and drying. Inside the skeletons that comprise the macroporous structure, “skeletal pores” with various sizes in nanometer scale have also been found by gas sorption measurements. The skeletal pores are deduced to be formed by secondary phase separation in the skeletons due to the thermodynamic instability that arises in the separated phases during the polymerization. The effects of the starting composition, molecular weight of PDMS, and the reaction temperature on the characteristics of the resultant macropores as well as the skeletal pores have been investigated.

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  1. Graduate School of Engineering, Kyoto University, Kyoto, Japan

    George Hasegawa

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  1. George Hasegawa
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Hasegawa, G. (2013). Pore Formation in Poly(divinylbenzene) Networks Derived from Organotellurium-Mediated Living Radical Polymerization. In: Studies on Porous Monolithic Materials Prepared via Sol–Gel Processes. Springer Theses. Springer, Tokyo. https://doi.org/10.1007/978-4-431-54198-1_2

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