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Motokawa, Ryuhei; Taniguchi, Tatsuo*; Kumada, Takayuki; Iida, You*; Aoyagi, Shota*; Sasaki, Yusuke*; Kori, Michinari*; Kishikawa, Keiki*
Macromolecules, 49(16), p.6041 - 6049, 2016/08
Times Cited Count：32 Percentile：69.70(Polymer Science)Motokawa, Ryuhei; Iida, You*; Zhao, Y.; Hashimoto, Takeji; Koizumi, Satoshi
Polymer Journal, 39(12), p.1312 - 1318, 2007/12
Times Cited Count：22 Percentile：54.07(Polymer Science)By utilizing a biconcave refractive neutron lens (MgF
), we constructed a focusing ultra-small-angle neutron scattering (USANS) spectrometer (SANS-J-II) at research reactor JRR3, Tokai Japan. SANS-J-II can successfully reach to 
=0.0003 
, where [= 4
sin(
)/
] is the magnitude of scattering vector given by wavelength and scattering angle 2, and simultaneously cover conventional SANS region up to = 0.004 by using 5-inch size & high resolution position sensitive area photomultiplier with scintillator (ZnS). Focusing USANS, thus realized, plays an important role to investigate the time-evolution of hierarchically ordered structures in the living radical polymerization solution, preparing poly (methyl methacrylate)- 
-polystyrene (PMMA-
-PS). In the reaction process to synthesize PS block chains from the end of PMMA block chain, we found the interplay between macro and microdomain structures as follows. Small-angle scattering at 
0.001 determined time-evolving microdomain structures; as the polymerization proceeds, (1) first by order-disorder transition, a lamellar microdomain appears and (2) second by order-order transitions, the morphologies of microdomains change to PS cylinder and successively to PS sphere. Ultra-small-angle scattering at 
0.001 , exhibits power law scattering (
) due to macrophase separation between PMMA--PS and PS homopolymer, appeared as by product. The exponent 
varies from 4 to 2, reflecting a grain boundary of macrodomain rich-in PMMA--PS; when a lamellar microdomain appears, Porod law gives = 4, whereas when cylinder and sphere appear, = 2, due to inhomogeniety of the microdomain spatial distribution.
Motokawa, Ryuhei; Koizumi, Satoshi; Iida, You; Kawakatsu, Toshihiro; Hashimoto, Takeji
no journal, ,
no abstracts in English
Motokawa, Ryuhei; Koizumi, Satoshi; Iida, You; Kawakatsu, Toshihiro; Hashimoto, Takeji
no journal, ,
no abstracts in English
Motokawa, Ryuhei; Koizumi, Satoshi; Iida, You*; Hashimoto, Takeji
no journal, ,
Focusing USANS plays an important role to investigate the time-evolution of hierarchically ordered structures in the living radical polymerization solution, preparing poly(methyl methacrylate)-block-polystyrene (PMMA-b-PS). In the reaction process to synthesize PS block chains from the end of PMMA block chain, we found the interplay between macro and microdomain structures as follows. As the polymerization proceeds, (1) first by polymerization-induced disorder-order transition, a lamellar microdomain appears and (2) second by order-order transitions, the morphologies of microdomains change to PS cylinder and successively to PS sphere. Ultra-small-angle scattering exhibits power law scattering due to macrophase separation between PMMA-b-PS and PS homopolymer, appeared as by-product.
Zhao, Y.; Miyamoto, Nobuyoshi*; Koizumi, Satoshi; Hashimoto, Takeji; Iida, You*; Kawakatsu, Toshihiro
no journal, ,
The simultaneous living anionic polymerization of non-deuterated isoprene (I) and styrene (S) monomers, initiated by sec-butyllithium in deuterated benzene (B-d6) was investigated by a combination of time-resolved small-angle neutron scattering (SANS), gel permeation chromatography (GPC), nuclear magnetic resonance (NMR) and ultraviolet-visible (UV-Vis) spectroscopy. In this study, we aim to reveal the change of the association formed by living polymer chain ends during the polymerization process and find that the association number changes from 4 to 2.
Motokawa, Ryuhei; Koizumi, Satoshi; Zhao, Y.; Hashimoto, Takeji; Iida, You*
no journal, ,
Focusing USANS plays an important role to investigate the time-evolution of hierarchically ordered structures in the controlled radical polymerization solution, preparing poly(methyl methacrylate)-block-polystyrene (PMMA-b-PS). In the reaction process to synthesize PS block chains from the end of PMMA block chain, we found the interplay between macro and microdomain structures as follows. As the polymerization proceeds, (1) first by polymerization-induced disorder-order transition, a lamellar microdomain appears and (2) second by order-order transitions, the morphologies of microdomains change to PS cylinder and successively to PS sphere. Ultra-small-angle scattering exhibits power law scattering due to macrophase separation between PMMA-b-PS and PS homopolymer, appeared as by-product.
Motokawa, Ryuhei; Koizumi, Satoshi; Hashimoto, Takeji; Iida, You*; Kawakatsu, Toshihiro
no journal, ,
We constructed a focusing ultra-small-angle scattering spectrometer (SANS-J-II) at research reactor JRR-3, Tokai, Japan. Focusing ultra-small-angle neutron scattering (USANS) and conventional small-angle neutron scattering (SANS) can observe the length scale about 1000 nm - 100 nm and 100 nm - 1 nm, respectively. Focusing USANS, thus realized, plays an important role to investigate the time-evolution of hierarchically ordered structures in the living radical polymerization solution, preparing poly(methyl methacrylate)-block-polystyrene. In the reaction process to synthesize PS block chains from the end of PMMA block chain, we found the interplay between macro and microdomain structures as follows. As the polymerization proceeds, (1) first by polymerization-induced disorder-order transition, a lamellar microdomain appears and (2) second by order-order transitions, the morphologies of microdomains change to PMMA cylinder and successively to PMMA sphere.
Motokawa, Ryuhei; Koizumi, Satoshi; Iida, You; Zhao, Y.; Kawakatsu, Toshihiro; Hashimoto, Takeji
no journal, ,
no abstracts in English
Motokawa, Ryuhei; Koizumi, Satoshi; Hashimoto, Takeji; Iida, You*
no journal, ,
We constructed a focusing ultra-small-angle scattering spectrometer (SANS-J-II) at research reactor JRR3, Tokai, Japan. Focusing unlra-small-angle neutron scattering (USANS) and conventional small-angle neutron scattering (SANS) can observe the length scale about 1000 nm - 100 nm and 100 nm - 1 nm, respectively. Focusing USANS, thus realized, plays an important role to investigate the time-evolution of hierarchically ordered structures in the living radical polymerization solution, preparing poly(methyl methacrylate)-block-polystyrene. In the reaction process to synthesize PS block chains from the end of PMMA block chain, we found the interplay between macro and microdomain structures as follows. As the polymerization proceeds, (i) first by polymerization-induced disorder-order transition, a lamellar microdomain appears and (ii) second by order-order transitions, the morphologies of microdomains change to PMMA cylinder and successively to PMMA sphere.
