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Oral presentation

Development of hydrogen permselective membranes by radiation-induced graft polymerization into porous PVDF films

Hasegawa, Shin; Azami, Shinya*; Sawada, Shinichi; Hino, Satoshi*; Isobe, Shigehito*; Hashimoto, Naoyuki*; Maekawa, Yasunari

no journal, ,

Hydrogen permselective membranes, which have high hydrogen permeability (approximately 10 $^{-8}$ 10 $^{-9}$ mol/(m $^{2}$ s Pa) with selectivity against water and nitrogen, have been developed by radiation-induced graft polymerization (RIGP) of an acrylic acid (AAc), tetramethoxysirylstyrene (TMSS), and styrene(St) monomers into porous poly(vinylidene fluoride) (PVDF) films. The porosity of the prepared porous grafted PVDF were almost constant against grafting degrees. Thus, by hot press compression, the porosity of the grafted membranes was reduced to a 20-40% level. The hydrogen permeability of the compressed grafted PVDF is 10 $^{-8}$ 10 $^{-9}$ mol/(m $^{2}$ s Pa) with the hydrogen permselectivity of 3.2 and 3.5 against water and nitrogen, respectively. The above results indicate that RIGP of porous films with a hot press process is a very effective method to prepare hydrogen permselective membranes.

Oral presentation

Structure-property relationships in graft-type polymer electrolyte membranes studied by complemental small angle neutron/X-ray scattering analyses

Maekawa, Yasunari; Zhao, Y.; Yoshimura, Kimio; Shishitani, Hideyuki*; Yamaguchi, Susumu*; Tanaka, Hirohisa*; Koizumi, Satoshi*

no journal, ,

no abstracts in English

Oral presentation

Development of radiation grafted anion-conducting electrolyte membranes and application to hydrazine hydrate fuel cells

Yoshimura, Kimio; Shishitani, Hideyuki*; Yamaguchi, Susumu*; Tanaka, Hirohisa*; Maekawa, Yasunari

no journal, ,

no abstracts in English

Oral presentation

Synthesis of well defined polymers in solid states by radiation/living graft polymerizations for polymer electrolyte membranes

Hamada, Takashi; Takeuchi, Kota*; Hasegawa, Shin; Maekawa, Yasunari

no journal, ,

no abstracts in English

Oral presentation

Nanoscopic structure of physically cross-linked nanogels investigated by small-angle neutron scattering

Sekine, Yurina; Endo, Hitoshi*; Iwase, Hiroki*; Takeda, Shigeo*; Mukai, Sadaatsu*; Fukazawa, Hiroshi; Sasaki, Yoshihiro*; Akiyoshi, Kazunari*

no journal, ,

Cholesterol-bearing pullulan (CHP) forms stable nanogel of 20 nm in size in water. The CHP nanogels can trap various proteins spontaneously. Owing to their characteristics, nanogels can be used in protein delivery systems, particularly for cancer vaccines. The spatial distribution and detailed structure of the cross-linking points are important factor determining their chemical and physical functions. The aim of this study is to investigate the structure of the nanogels by means of contrast variation small-angle neutron scattering (CV-SANS), which enables us to determine quantitative complex structure at nanometer scale. In this presentation, we will discuss the detailed structure of the CHP nanogel.