Nature Search

Monomer Reactivity Ratios and Q,e-Values of Trialkylsilyl Acrylates and Methacrylates

Hirotada Fujiwara
Tadashi Narita
Hiroshi Hamana
Research01 Jan 2001
Polymer Journal

Volume: 33, P: 102-103
Fluorinated Hybrid Polymers by Copolymerization of Trialkylsilyl Methacrylate with Fluoroalkyl Methacrylate

Hirotada Fujiwara
Tadashi Narita
Koichi Shimizu
Research01 Sept 2002
Polymer Journal

Volume: 34, P: 714-717
Elevated sFlt-1/PlGF ratio in women with suspected or confirmed early-onset preeclampsia and super-imposed preeclampsia complicated by HELLP syndrome as well as abnormal umbilical artery Doppler findings and non-reassuring fetal status requiring immediate delivery: a prospective cohort study

Akihide Ohkuchi
Hirotada Suzuki
Tatsuo Yamamoto
Research20 Oct 2025
Hypertension Research

Volume: 48, P: 3101-3112
Molecular picture of fluoropolymer adsorption on nanocarbon materials

Composites of fluoropolymer (FKM) and nano-carbon fillers have been considered as sealing materials for hydrogen fuel storage. We here characterize, structurally and dynamically, FKM chains adsorbed on single-walled carbon nanotubes (SWCNTs) and carbon black (CB), which were prepared by a solvent leaching method.

Daisuke Kawaguchi
Kazuki Sasahara
Keiji Tanaka
Research21 Jul 2021
Polymer Journal

Volume: 53, P: 1469-1473
Nanoscale heterogeneous structure of polyacrylonitrile-co-butadiene with different molecular mobilities analyzed by spin–spin relaxation time

Rubber materials are often used in fluid sealing. Molecular mobility of rubber is one of the important parameter for designing suitable material for rubber seals. Pulsed proton nuclear magnetic resonance (¹H-NMR) results showed that crude acrylonitrile–butadiene rubber has two components with long and short spin–spin relaxation time assigned to the altenatively copolymerized acrylonitrile–butadiene and butadiene block sequences, respectively. We conclude that these components with different mobilities in crude rubber originated from a inhomogeneity in the first-order structure of molecular chains.

Hiroaki Ono
Hirotada Fujiwara
Shin Nishimura
Research10 Apr 2013
Polymer Journal

Volume: 45, P: 1027-1032
Evaluation of hydrogen dissolved in rubber materials under high-pressure exposure using nuclear magnetic resonance

The hydrogen dissolved in acrylonitrile butadiene rubber due to high-pressure hydrogen exposure was analyzed by solid-state ¹H NMR. On the basis of pressure dependency of chemical shift of free hydrogen and relaxation time of dissolved hydrogen, the hydrogen with two different characters at 4.3 and 4.8 p.p.m. were ensured to be with different mobility. Conversion of the ratio of the two states of hydrogen suggested the transition of hydrogen from the state constrained to rubber chemical structure to free volume during hydrogen elimination process.

Hirotada Fujiwara
Shin Nishimura
Research27 Jun 2012
Polymer Journal

Volume: 44, P: 832-837
Clinical relevance of reversible cerebral vasoconstriction syndrome in pregnant women with posterior reversible encephalopathy syndrome: review of case reports in Japan

Hirotada Suzuki
Akihide Ohkuchi
Hiroyuki Fujiwara
Reviews21 Feb 2024
Hypertension Research

Volume: 47, P: 1288-1297
Automated electrochemiluminescence immunoassay for serum PlGF levels in women with singleton pregnancy at 9–13 weeks of gestation predicts preterm preeclampsia: a retrospective cohort study

Akihide Ohkuchi
Kayo Takahashi
Hiroyuki Fujiwara
Research22 Dec 2023
Hypertension Research

Volume: 47, P: 1196-1207

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