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Sujita, Ryota*; Imai, Sahori*; Ouchi, Makoto*; Aoki, Hiroyuki; Terashima, Takaya*
Macromolecules, 56(23), p.9738 - 9749, 2023/12
Times Cited Count：0 Percentile：0(Polymer Science)Watanabe, Teppei*; Sekine, Yurina; Ikeda-Fukazawa, Tomoko*
Macromolecules, 56(16), p.6217 - 6221, 2023/08
Times Cited Count：1 Percentile：51.7(Polymer Science)To investigate the ability of hydrogels to separate hydrogen isotopes in water, we analyzed the Raman spectra of poly-N,N-dimethylacrylamide (PDMAA) hydrogels containing deuterated water during dehydration. The results show a significant fractionation of hydrogen isotopes during dehydration. The D molar ratio of the hydrogel increases from 0.056 to 
0.2 during dehydration from 90.5 wt% to 5 wt% in water content. Deuterated water preferentially forms hydrogen bonds with hydrophilic groups of the polymer in hydrogels because of the difference in strengths of hydrogen bonds between protium and deuterium. As a result, normal water preferentially evaporates in the initial stage of dehydration, leaving deuterated water in the drying hydrogel. The results suggest that hydrogels are an efficient material for isotope fractionation with evaporation.
Hibino, Masayuki*; Takata, Shinichi; Hiroi, Kosuke; Aoki, Hiroyuki; Terashima, Takaya*
Macromolecules, 56(8), p.2955 - 2964, 2023/04
Times Cited Count：0 Percentile：0(Polymer Science)Imai, Sahori*; Arakawa, Masato*; Nakanishi, Yohei*; Takenaka, Mikihito*; Aoki, Hiroyuki; Ouchi, Makoto*; Terashima, Takaya*
Macromolecules, 55(20), p.9113 - 9125, 2022/10
Times Cited Count：2 Percentile：27.19(Polymer Science)Nogami, Satoshi*; Kadota, Kazunori*; Uchiyama, Hiromasa*; Arima-Osonoi, Hiroshi*; Iwase, Hiroki*; Tominaga, Taiki*; Yamada, Takeshi*; Takata, Shinichi; Shibayama, Mitsuhiro*; Tozuka, Yuichi*
International Journal of Biological Macromolecules, 190, p.989 - 998, 2021/11
Times Cited Count：6 Percentile：39.73(Biochemistry & Molecular Biology)Izumi, Atsushi*; Shudo, Yasuyuki*; Shibayama, Mitsuhiro*; Yoshida, Tessei*; Miyata, Noboru*; Miyazaki, Tsukasa*; Aoki, Hiroyuki
Macromolecules, 53(10), p.4082 - 4089, 2020/05
Times Cited Count：7 Percentile：32.71(Polymer Science)Gupit, C. I.*; Li, X.*; Maekawa, Ryosuke*; Hasegawa, Naoki*; Iwase, Hiroki*; Takata, Shinichi; Shibayama, Mitsuhiro*
Macromolecules, 53(4), p.1464 - 1473, 2020/02
Times Cited Count：13 Percentile：54.29(Polymer Science)Shudo, Yasuyuki*; Izumi, Atsushi*; Hagita, Katsumi*; Yamada, Takeshi*; Shibata, Kaoru; Shibayama, Mitsuhiro*
Macromolecules, 51(16), p.6334 - 6343, 2018/08
Times Cited Count：11 Percentile：40.86(Polymer Science)Tashiro, Koji*; Kusaka, Katsuhiro*; Hosoya, Takaaki*; Ohara, Takashi; Hanesaka, Makoto*; Yoshizawa, Yoshinori*; Yamamoto, Hiroko*; Niimura, Nobuo*; Tanaka, Ichiro*; Kurihara, Kazuo*; et al.
Macromolecules, 51(11), p.3911 - 3922, 2018/06
Times Cited Count：5 Percentile：18.18(Polymer Science)
-butadiene) rubbersYamaguchi, Daisuke; Yuasa, Takeshi*; Sone, Takuo*; Tominaga, Tetsuo*; Noda, Yohei*; Koizumi, Satoshi*; Hashimoto, Takeji*
Macromolecules, 50(19), p.7739 - 7759, 2017/10
Times Cited Count：14 Percentile：48.82(Polymer Science)We elucidated the spatial distribution of filler particles in cross-linked poly(styrene--butadiene) rubbers (SBR) developed under a typical fillers/rubbers compounding process as one of dissipative structures formed under a stress field imposed on the given system. The dispersion state of the fillers in SBR was clarified on the basis of hierarchical structures consisting of five structure levels. More specifically, it has the following characteristics depending on the specific interactions: Small, compact clusters build up compact mass-fractal structures, while large, loose clusters build up open mass-fractal structures.
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：19 Percentile：58.6(Polymer Science)Ghobadi, A. F.*; Letteri, R.*; Parelkar, S. S.*; Zhao, Y.; Chan-Seng, D.*; Emrick, T.*; Jayaraman, A.*
Biomacromolecules, 17(2), p.546 - 557, 2016/02
Times Cited Count：15 Percentile：55.55(Biochemistry & Molecular Biology)Tran Duy, T.*; Sawada, Shinichi; Hasegawa, Shin; Yoshimura, Kimio; Oba, Yojiro*; Onuma, Masato*; Katsumura, Yosuke*; Maekawa, Yasunari
Macromolecules, 47(7), p.2373 - 2383, 2014/04
Times Cited Count：30 Percentile：70.08(Polymer Science)The hierarchical structures of graft-type ETFE-based polymer electrolyte membranes (ETFE-PEMs) were investigated using small- and ultrasmall-angle X-ray cattering experiments. The ETFE-PEMs with IECs 
2.4 mmol/g possessed conducting graft domains around lamellar crystals, with a d-spacing of 21.8-29.1 nm, and oriented crystallites with short and long correlation distances of 218-320 and 903-1124 nm, respectively. The membranes with IECs 
2.7 mmol/g showed a new phase of crystallite network domains with a d-range of 225-256 nm, indicating a phase transition from oriented crystallite to crystallite network structures in the IEC range of 2.4-2.7 mmol/g. Noted that for the ETFE-PEMs with high IECs higher conductivity at 30% RH and compatible tensile strengths at 100% RH and 80 
C, compared with Nafion, originated from the well-interconnected ion channels around the crystallites and the remaining lamellar crystals and crystallites, respectively.
-poly(methyl methacrylate) with Pd nanoparticlesZhao, Y.; Saijo, Kenji*; Hashimoto, Takeji
Macromolecules, 46(3), p.957 - 970, 2013/02
Times Cited Count：7 Percentile：22.66(Polymer Science)Motokawa, Ryuhei; Taniguchi, Tatsuo*; Sasaki, Yusuke*; Enomoto, Yuto*; Murakami, Fumiyasu*; Kasuya, Masakatsu*; Kori, Michinari*; Nakahira, Takayuki*
Macromolecules, 45(23), p.9435 - 9444, 2012/11
Times Cited Count：9 Percentile：30.22(Polymer Science)
rangeIwase, Hiroki*; Sawada, Shinichi; Yamaki, Tetsuya; Koizumi, Satoshi; Onuma, Masato*; Maekawa, Yasunari
Macromolecules, 45(22), p.9121 - 9127, 2012/11
Times Cited Count：19 Percentile：50.58(Polymer Science)Fundamental understanding of the structure-property relationship of polymer electrolyte membranes (PEM) is prerequisite for a material design satisfying PEM performance requirement. Small-angle scattering in a wide- range was observed by focusing small-angle neutron scattering (FSANS), small-angle neutron scattering (SANS), and small-angle X-ray scattering (SAXS). The hierarchical structure of the PEM was characterized as being composed of conducting layers (graft domains) in lamellar stacks with 48-57 nm spacing on the surfaces of 480 nm diameter crystallites and ultra-small structures with a 1.7 nm correlation distance of the sulfonic acid groups in the conducting layers. From the change in the SAXS profiles as a function of grafting degrees, it was revealed that the graft domains around the crystallites were connected with the adjoining domains and thus, the PEMs with a higher degree of grafting had conductivity higher than that of Nafion.
form on the basis of the 2-dimensional wide-angle synchrotron X-ray and neutron diffraction measurementsWasanasuk, K.*; Tashiro, Koji*; Hanesaka, Makoto*; Ohara, Takashi*; Kurihara, Kazuo; Kuroki, Ryota; Tamada, Taro; Ozeki, Tomoji*; Kanamoto, Tetsuo*
Macromolecules, 44(16), p.6441 - 6452, 2011/07
Times Cited Count：186 Percentile：98.62(Polymer Science)The crystal structure of poly(L-lactic acid) (PLLA) 
form has been analyzed in detail by utilizing the 2-dimensional wideangle X-ray (WAXD) and neutron diffraction (WAND) data measured for the ultradrawn sample. The WAXD data were collected using a synchrotron-sourced high-energy X-ray beam of wavelength 0.328
at SPring-8 and the WAND data were measured using a neutron beam of wavelength 1.510 with a BIX-3 detector at JRR-3, JAEA. The initial crystal structure model was extracted successfully by a direct method under the assumption of the space group 
2
22 using about 700 X-ray reflections observed at -150C. The crystal structure model obtained by the direct method was refined so that the best agreement between the observed and calculated integrated intensities was obtained or the reliability factor (
) became minimal: was 18.2% at -150C and 23.2% at 25C. The obtained chain conformation took the distorted (10/3) helical form with 2 helical symmetry along the chain axis. However, the symmetrically forbidden reflections were detected in a series of the 00l reflections, requiring us to erase the 2 screw symmetry along the molecular chain. By assuming the space group symmetry 2, the structural refinement was made furthermore and the finally obtained R factor was 19.3% at -150C and 19.4% at 25C. This refined model was found to reproduce the observed reflection profiles well for all the layer lines. The X-ray-analyzed crystal structure was transferred to the WAND data analysis to determine the hydrogen atomic positions. The factor was 23.0% for the 92 observed reflections at 25C. The agreement between the observed and calculated layer line profiles was good.
Terashima, Takaya*; Motokawa, Ryuhei; Koizumi, Satoshi*; Sawamoto, Mitsuo*; Kamigaito, Masami*; Ando, Tsuyoshi*; Hashimoto, Takeji*
Macromolecules, 43(19), p.8218 - 8232, 2010/10
Times Cited Count：42 Percentile：77.5(Polymer Science)Zhao, Y.; Miyamoto, Nobuyoshi*; Koizumi, Satoshi; Hashimoto, Takeji
Macromolecules, 43(6), p.2948 - 2959, 2010/04
-poly(
-isopropylacrylamide); Elucidation of specific reaction fields for quasi-living polymerization by time-resolved SANSMotokawa, Ryuhei; Koizumi, Satoshi*; Hashimoto, Takeji*; Annaka, Masahiko*; Nakahira, Takayuki*
Macromolecules, 43(2), p.752 - 764, 2010/01
Times Cited Count：18 Percentile：50.14(Polymer Science)