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Organic polymer-based monolithic columns prepared by radiation-induced polymerization

Ueki, Yuji*; Iwashita, Yoshikazu*; Hotta, Hiroki*; Odake, Tamao*; Tsunoda, Kinichi*; Umemura, Tomonari*; Katakai, Akio; Tamada, Masao

The studies on monolith columns, which consist of polymer medium with through-pore ($$sim$$ $$mu$$m), have been vigorously performed to aim at rapid and high-resolution separation of organic materials. The monoliths are directly synthesized in fused silica capillaries by thermal polymerization. It is difficult to prepare the homogeneous monoliths by thermal polymerization, because of the heterogeneity of heat transfer and initiator dispersion. In the present paper, polymer monoliths were prepared by $$gamma$$-rays irradiation. As a result, homogeneous monoliths, which composed of adhered particulate of polymer $$sim$$ 1 $$mu$$m in diameter. The highest separation of the monolith column was obtained at 10 kGy irradiation when the total concentration of monomers and cross-linker were charged at 20 and 25%, respectively.

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