Showing papers by "Jun-ichi Kadokawa published in 2011"
189 citations
TL;DR: In this article, the preparation of chitin nanowiskers using an ionic liquid, 1-allyl-3methylimidazolium bromide (AMIMBr), was performed.
147 citations
TL;DR: The chemoenzymatic synthesis of an amylose-grafted xanthan gum is reported, which was converted into a hydrogel with high water content by replacement of the ionic liquid with water and the mechanical properties of the resulting hydrogels were evaluated by compressive testing.
37 citations
TL;DR: Modeling calculations support the amylose's chiral recognition in favor of PLLA and the atomistic details of the inclusion complex which involved the preferred orientation of the constituent molecular chains with respect to their fiber axis is proposed.
Abstract: Amylose selectively includes poly(L-lactide) (PLLA) among the poly(lactide)s (PLAs) to produce an inclusion complex when the phosphorylase-catalyzed polymerization of α-D-glucose 1-phosphate is performed in the presence of PLLA, poly(D-lactide) (PDLA), or poly(DL-lactide) (PDLLA) (vine-twining polymerization). This result indicates that amylose recognizes the chirality in PLAs on the formation of an inclusion complex in vine-twining polymerization. Modeling calculations support the amylose's chiral recognition in favor of PLLA and the atomistic details of the inclusion complex which involved the preferred orientation of the constituent molecular chains with respect to their fiber axis is proposed.
28 citations
TL;DR: In this paper, Amylose-poly(tetrahydrofuran) (PTHF) inclusion complexes were formed when a mixture of amylose with PTHF was stirred in 1-butyl-3methylimidazolium chloride of an ionic ionic battery.
Abstract: In this study, we found that amylose–poly(tetrahydrofuran) (PTHF) inclusion complexes were formed when a mixture of amylose with PTHF was stirred in 1-butyl-3-methylimidazolium chloride of an ionic...
24 citations
TL;DR: It was found that lipase-catalyzed hydrolysis of P(GA-co-CL) in the inclusion complex was partly inhibited, and phosphorylase-Catalyzed polymerization of α-D-glucose 1-phosphate from maltoheptaose as a primer in the presence of P-Co-CL (vine-twining polymerization) was found to be successful.
Abstract: We found that the inclusion complexes composed of amylose and poly(glycolic acid-co-ɛ-caprolactone) (P(GA-co-CL)) of a biodegradable polyester were prepared by phosphorylase-catalyzed polymerization of α-D-glucose 1-phosphate from maltoheptaose as a primer in the presence of P(GA-co-CL) (vine-twining polymerization). In addition, it was found that lipase-catalyzed hydrolysis of P(GA-co-CL) in the inclusion complex was partly inhibited.
20 citations
TL;DR: In this paper, an imidazolium-type fluorescent polymeric ionic liquid film containing rhodamine moieties was synthesized, which showed fluorescence resonance-energy-transfer (FRET) property, resulting in emissions by excitation at wide wavelength areas.
Abstract: This paper reports synthesis of an imidazolium-type fluorescent polymeric ionic liquid film containing rhodamine moieties, which shows fluorescence resonance-energy-transfer (FRET) property, resulting in emissions by excitation at wide wavelength areas. First, radical copolymerization of two polymerizable ionic liquid, which had one and two polymerizable groups, respectively, was carried out with AIBN as an initiator to confirm whether a transparent polymeric ionic liquid film could be produced. Then, radical terpolymerization of the two ionic liquids with a rhodamine derivative having a polymerizable group was performed under the similar conditions as that for the above copolymerization to give the fluorescent polymeric ionic liquid film containing rhodamine moieties. The fluorescence spectra of the resulting film exhibited emissions due to the rhodamine group by excitation at wide wavelength areas. This result indicated occurrence of FRET from the polymeric ionic liquid units to the rhodamine moieties in the film because the excitation-wavelength-dependent emissions due to the polymeric ionic liquid were partially overlapped with an absorption peak due to the rhodamine group.
19 citations
15 citations
TL;DR: In this paper, photo irradiation at 280 - 370 nm wavelengths to a solution of MB in an ionic liquid, 1-butyl-3methylimidazolium chloride (BMIMCl), was confirmed by color change and UV-Vis measurement of the solution.
Abstract: Reduction of methylene blue (MB) occurred by photo irradiation at 280 - 370 nm wavelengths to a solution of MB in an ionic liquid, 1-butyl-3-methylimidazolium chloride (BMIMCl), which was confirmed by color change and UV-Vis measurement of the solution. Furthermore, the reduced MB was oxidized again by standing the solution under the conditions of light shielding at 50?C. The fluorescence spectra of the solution excited at 350 nm suggested that the photo-induced reduction probably took place via electron-transfer from BMIMCl to MB.
10 citations
TL;DR: In this paper, the preparation of semi-interpenetrating polymer network (semi-IPN) composites composed of natural rubber and condensed tannin was performed by means of the enzyme-mimetic cross-linking of condensed tANNin catalyzed by hematin.
Abstract: In this study, the preparation of semi-interpenetrating polymer network (semi-IPN) composites composed of natural rubber and condensed tannin was performed by means of the enzyme-mimetic cross-linking of condensed tannin catalyzed by hematin. Prior to the preparation of the composites, the hematin-catalyzed cross-linking behavior of condensed tannin was evaluated by the TGA measurement. The TGA results indicated that condensed tannin was sufficiently cross-linked by the hematin-catalyzed reaction in the presence of appropriate amounts of 30% (w/v) H2O2 aq. to give the relatively thermostable materials. For the preparation of the composites, a solution of condensed tannin and hematin, and subsequently 30% (w/v) H2O2 aq. were added to natural rubber latex and the mixture was stirred at room temperature for 10 min to perform the cross-linking of condensed tannin, followed by drying of the reaction mixture at 50 °C for 5 h, which was subsequently put into a heat device and hot-pressed at 100 °C and 20 MPa for 20 min to give the semi-IPN composite. The tensile stress–strain measurement of the composites was conducted to evaluate the mechanical properties, which were changeable depending on the weight ratios of natural rubber to condensed tannin and the amounts of 30% (w/v) H2O2 aq. Moreover, the miscibility of the cross-linked tannin with natural rubber in the composite was evaluated by the SEM measurement.
6 citations