Kōbe-shi, Japan
Kōbe-shi, Japan
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Nakano Y.,Hokkaido University | Nakano Y.,Tl Corporation | Takahashi Y.,Tl Corporation | Kanno T.,MORESCO | And 2 more authors.
Digest of Technical Papers - SID International Symposium | Year: 2015

We report an ultrasensitive and stable instrument for water vapor transmission rate evaluation. Water vapor permeated through gas barrier is condensed by a cold trap and measured by a mass spectrometer. Intermittent absorption and release operation of the cold trap enables the measurement immune to gradual change of background HjO. ©2015 SID.

Adachi K.,Yamaguchi University | Honda K.,Yamaguchi University | Yamazaki S.,Yamaguchi University | Hirano T.,MORESCO | And 6 more authors.
Polymer Engineering and Science | Year: 2011

The vinyltrimethoxysilane-grafted ethylene-propylene copolymer/ trifunctional methoxysilane (EPR-g-VTMS/RTMS) composites were prepared via in situ silica sol-gel reactions. Five trifunctional methoxysilane compounds (n-hexyltrimethoxysilane, n-decyltrimethoxysilane, n-tetradecyltrimethoxysilane, n-octadecyltrimethoxysilane, and phenyltrimethoxysilane) have been selected for this study. The water-cross-linked EPR-g-VTMS/RTMS composites were characterized by attenuated total reflectance-Fourier transform infrared spectroscopy, gel content, solid-state 29Si CP/MAS NMR, wide-angle x-ray scattering, tensile strength, and field emission scanning electron microscopy measurements. The type of RTMS additive has a substantial influence on the nature of siloxane band networks and eventually the mechanical tensile properties. This finding suggests that the interaction and/or entanglement between the EPR-g-VTMS matrix and the substituent of the RTMS additives are crucial for the modifying mechanical properties. Moreover, for the water-cross-linked EPR-g-VTMS/CnTMS (n = 6, 10, 14, and 18) composites, the joint evidence provided by attenuated total reflectance-Fourier transform infrared spectroscopy, 29Si CP/MAS NMR, and wide-angle x-ray scattering results suggested the formation of ladder-type poly(n-alkyl silsesquioxane)s and the presence of the highly ordered structure with a thickness equal to the length of two n-alkyl groups in all-trans conformation. POLYM. ENG. SCI., 2011. © 2010 Society of Plastics Engineers.

Shimada T.,Hokkaido University | Nakano Y.,TI Corporation | Takahashi Y.,TI Corporation | Kanno T.,MORESCO
Proceedings of the International Display Workshops | Year: 2011

We have developed an instrument for ultrasensitive (<10-6 g/m2/day) and rapid (<1 day) measurement of water vapor transmission rate in gas barrier materials. Water vapor that has permeated through the barrier in atmospheric carrier gas is condensed by a cold trap and transferred to mass spectrometer in ultrahigh vacuum.

Adachi K.,Yamaguchi University | Toyomura S.,Yamaguchi University | Miyakuni Y.,Yamaguchi University | Yamazaki S.,Yamaguchi University | And 2 more authors.
Polymers for Advanced Technologies | Year: 2015

The catalytic performances of several bis(acetylacetonato)metal complexes [Cu(acac)2, Zn(acac)2, TiO(acac)2, VO(acac)2, MoO2(acac)2, and WO2(acac)2] were investigated for the crosslinking reaction via transesterifications in the ethylene-vinyl acetate copolymer/tetraethoxysilane (EVA/TEOS) composite system by means of dynamic attenuated total reflectance Fourier transform infrared, solvent swelling, and solid-state 29Si cross polarization/magic angle spinning nuclear magnetic resonance techniques. Results of the kinetic examination revealed that MoO2(acac)2 and WO2(acac)2 exhibited a higher catalytic activity than di-n-butyltin(IV) oxide, which is a catalyst most commonly used for the transesterification process in polymer system, but has a toxic effect on the environmental health. And furthermore, the crosslink density and final siloxane network structure of crosslinked EVA/TEOS composites are found to be greatly correlated with the catalyst used. On the basis of the SN2-Si pathway, a plausible catalytic mechanism of MoO2(acac)2 and WO2(acac)2 was proposed for the crosslinking reaction via transesterifications of the vinyl acetate moieties in EVA backbone with the ethoxysilane groups in one TEOS molecule. The findings in this study may fill the blank in the high performance and environmentally friendly catalyst in the field of the crosslinking reactions in polymer system and provide useful clue for other transesterifications. © 2015 John Wiley & Sons, Ltd.

Shimada T.,Hokkaido University | Shimada T.,Chiyoda Corporation | Yanase T.,Hokkaido University | Nagahama T.,Hokkaido University | Kanno T.,MORESCO
Japanese Journal of Applied Physics | Year: 2013

Materials and structures for water vapor barrier sealing are now actively studied, as the commercialization of organic electronic devices has become a reality. In this paper, we focus on the edge sealing barriers, in which diffusion plays an essential role. In the past, the diffusion-limited gas barrier properties were analyzed in the steady-state approximation, which is never reached within the device lifetime in the application for organic electronics. We analyze them using a simple analytical model. The diffusion before reaching the steady state is a strongly non-linear process, as is well known, and the length scale of approximately 1-10mm is very important when a practical polymer resin is used for the edge seal. © 2013 The Japan Society of Applied Physics.

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