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Atsushi Takahara - One of the best experts on this subject based on the ideXlab platform.
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biobased polymer coating using catechol derivative Urushiol
Langmuir, 2016Co-Authors: Hirohmi Watanabe, Aya Fujimoto, Jin Nishida, Tomoyuki Ohishi, Atsushi TakaharaAbstract:We have investigated the mechanism of the superior mechanical robustness of coated thin films of the catechol derivative Urushiol. We synthesized hydrogenated Urushiol (h-Urushiol) by hydrogenating the double bonds in the long alkyl side chain of Urushiol, and the physical properties of thin films of mixtures of Urushiol and h-Urushiol were evaluated. Atomic force microscopy observations revealed that these coated thin films have a homogeneous surface with no phase separation, regardless of the h-Urushiol content, arising from the similarity of the chemical structures. The films showed good adhesive properties because the adhesion originates from the catechol structure. In contrast, curing time depended strongly upon the h-Urushiol content. The curing of the h-Urushiol thin film took 12 h, whereas the Urushiol thin film was cured within 10 min. Moreover, the strain-induced elastic buckling instability for mechanical measurements test and the bulge test confirmed that the increase in the h-Urushiol content decreased the mechanical strength. Because the double bonds in the Urushiol side chain contribute to forming the highly cross-linked structure, the lack of double bonds in h-Urushiol resulted in the slow curing and low mechanical strength. Interestingly, the mechanical robustness started to increase over 80 mol % h-Urushiol. The saturated long alkyl side chain of h-Urushiol faced the surface, and the regular structure of the uniform side chain may improve the mechanical properties of the coated film. Our results will help to develop biomimetic catechol-based coatings.
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Biobased Polymer Coating Using Catechol Derivative Urushiol
2016Co-Authors: Hirohmi Watanabe, Aya Fujimoto, Jin Nishida, Tomoyuki Ohishi, Atsushi TakaharaAbstract:We have investigated the mechanism of the superior mechanical robustness of coated thin films of the catechol derivative Urushiol. We synthesized hydrogenated Urushiol (h-Urushiol) by hydrogenating the double bonds in the long alkyl side chain of Urushiol, and the physical properties of thin films of mixtures of Urushiol and h-Urushiol were evaluated. Atomic force microscopy observations revealed that these coated thin films have a homogeneous surface with no phase separation, regardless of the h-Urushiol content, arising from the similarity of the chemical structures. The films showed good adhesive properties because the adhesion originates from the catechol structure. In contrast, curing time depended strongly upon the h-Urushiol content. The curing of the h-Urushiol thin film took 12 h, whereas the Urushiol thin film was cured within 10 min. Moreover, the strain-induced elastic buckling instability for mechanical measurements test and the bulge test confirmed that the increase in the h-Urushiol content decreased the mechanical strength. Because the double bonds in the Urushiol side chain contribute to forming the highly cross-linked structure, the lack of double bonds in h-Urushiol resulted in the slow curing and low mechanical strength. Interestingly, the mechanical robustness started to increase over 80 mol % h-Urushiol. The saturated long alkyl side chain of h-Urushiol faced the surface, and the regular structure of the uniform side chain may improve the mechanical properties of the coated film. Our results will help to develop biomimetic catechol-based coatings
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spray assisted nanocoating of the biobased material Urushiol
Langmuir, 2015Co-Authors: Hirohmi Watanabe, Aya Fujimoto, Atsushi TakaharaAbstract:We have demonstrated the spray-assisted coating of the catechol derivative, Urushiol. Spraying a mixture of Urushiol and iron(II) acetate formed a uniform coating about 10 nm thick, as confirmed by AFM observations. XPS measurements revealed that various substrates, including polyolefins and thermosetting resins, were successfully coated with Urushiol. The coating showed good solvent tolerance and coating adhesion after baking at 100 °C for 10 min or after aerobic oxidation for several days. Interestingly, quartz crystal microbalance (QCM) measurements and strain-induced elastic buckling instability for mechanical measurements (SIEBIMM) revealed that density and Young’s modulus of the spray-assisted nanocoatings were higher than those of spray-coated samples. Moreover, the coating was uninvolved in physical properties except surface properties, as demonstrated by several experiments. Because Urushiol is a promising biobased material, our unique spray-assisted coating technique could provide a general appr...
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Spray-Assisted Nanocoating of the Biobased Material Urushiol
2015Co-Authors: Hirohmi Watanabe, Aya Fujimoto, Atsushi TakaharaAbstract:We have demonstrated the spray-assisted coating of the catechol derivative, Urushiol. Spraying a mixture of Urushiol and iron(II) acetate formed a uniform coating about 10 nm thick, as confirmed by AFM observations. XPS measurements revealed that various substrates, including polyolefins and thermosetting resins, were successfully coated with Urushiol. The coating showed good solvent tolerance and coating adhesion after baking at 100 °C for 10 min or after aerobic oxidation for several days. Interestingly, quartz crystal microbalance (QCM) measurements and strain-induced elastic buckling instability for mechanical measurements (SIEBIMM) revealed that density and Young’s modulus of the spray-assisted nanocoatings were higher than those of spray-coated samples. Moreover, the coating was uninvolved in physical properties except surface properties, as demonstrated by several experiments. Because Urushiol is a promising biobased material, our unique spray-assisted coating technique could provide a general approach for material-independent surface modification techniques that are environmentally sustainable
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Surface functionalization by decal-like transfer of thermally cross-linked Urushiol thin films.
ACS Applied Materials & Interfaces, 2014Co-Authors: Hirohmi Watanabe, Aya Fujimoto, Atsushi TakaharaAbstract:We have demonstrated surface functionalization through the decal-like transfer of thermally cross-linked Urushiol thin films onto various substrates. Tensile adhesive strength measurements showed that the film adheres strongly to the surface of various substrates including chemically inert materials, such as polyolefins and thermosetting resins, because of the properties of Urushiol. Furthermore, the highly cross-linked structure of Urushiol made the films mechanically robust. These two properties allowed the fabrication of practicable thin films for indirect surface modification. Actually, the robust thin film served as a scaffold for an Au thin film, which was then bound to various substrates. Surface-texturing of nanodecal was also demonstrated as an application aspects.
Hirohmi Watanabe - One of the best experts on this subject based on the ideXlab platform.
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photocurable Urushiol analogues bearing methacryloxy containing side chains
Langmuir, 2019Co-Authors: Hirohmi Watanabe, Mariko Takahashi, Hideyuki Kihara, Masaru YoshidaAbstract:Photocurable Urushiol analogues were synthesized using eugenol (an ingredient of clove oil) as the starting material. Photo-induced radical polymerization with 2,2-dimethoxy-2-phenylacetophenone as...
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Biobased Coatings Based on Eugenol Derivatives
2018Co-Authors: Hirohmi Watanabe, Mariko Takahashi, Hideyuki Kihara, Masaru YoshidaAbstract:We have fabricated plant-based coating materials using Urushiol analogues that were synthesized via a simple three-step route from eugenol (4-allyl-2-methoxyphenol), an allyl-substituted guaiacol. To mimic the chemical structure of Urushiol, the allyl chain of eugenol was substituted with alkyl thiols by a thiol–ene reaction. The guaiacol backbone was modified to a catechol backbone through a silylation/desilylation reaction. Uniform thin films were obtained on various substrates by spin-coating a solution of the Urushiol analogues and iron(II) acetate. The physical and chemical properties of these films were comparable to those of Urushiol thin films, and the adhesion, mechanical strength, and antioxidant properties were superior. The hydrophobicity and Young’s modulus of the film increased with the increase in the alkyl chain length. Because various functional units can be introduced to the catechol backbone, our method could be used to fabricate environmentally sustainable, multifunctional, high-performance coatings from eugenol
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biobased polymer coating using catechol derivative Urushiol
Langmuir, 2016Co-Authors: Hirohmi Watanabe, Aya Fujimoto, Jin Nishida, Tomoyuki Ohishi, Atsushi TakaharaAbstract:We have investigated the mechanism of the superior mechanical robustness of coated thin films of the catechol derivative Urushiol. We synthesized hydrogenated Urushiol (h-Urushiol) by hydrogenating the double bonds in the long alkyl side chain of Urushiol, and the physical properties of thin films of mixtures of Urushiol and h-Urushiol were evaluated. Atomic force microscopy observations revealed that these coated thin films have a homogeneous surface with no phase separation, regardless of the h-Urushiol content, arising from the similarity of the chemical structures. The films showed good adhesive properties because the adhesion originates from the catechol structure. In contrast, curing time depended strongly upon the h-Urushiol content. The curing of the h-Urushiol thin film took 12 h, whereas the Urushiol thin film was cured within 10 min. Moreover, the strain-induced elastic buckling instability for mechanical measurements test and the bulge test confirmed that the increase in the h-Urushiol content decreased the mechanical strength. Because the double bonds in the Urushiol side chain contribute to forming the highly cross-linked structure, the lack of double bonds in h-Urushiol resulted in the slow curing and low mechanical strength. Interestingly, the mechanical robustness started to increase over 80 mol % h-Urushiol. The saturated long alkyl side chain of h-Urushiol faced the surface, and the regular structure of the uniform side chain may improve the mechanical properties of the coated film. Our results will help to develop biomimetic catechol-based coatings.
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Biobased Polymer Coating Using Catechol Derivative Urushiol
2016Co-Authors: Hirohmi Watanabe, Aya Fujimoto, Jin Nishida, Tomoyuki Ohishi, Atsushi TakaharaAbstract:We have investigated the mechanism of the superior mechanical robustness of coated thin films of the catechol derivative Urushiol. We synthesized hydrogenated Urushiol (h-Urushiol) by hydrogenating the double bonds in the long alkyl side chain of Urushiol, and the physical properties of thin films of mixtures of Urushiol and h-Urushiol were evaluated. Atomic force microscopy observations revealed that these coated thin films have a homogeneous surface with no phase separation, regardless of the h-Urushiol content, arising from the similarity of the chemical structures. The films showed good adhesive properties because the adhesion originates from the catechol structure. In contrast, curing time depended strongly upon the h-Urushiol content. The curing of the h-Urushiol thin film took 12 h, whereas the Urushiol thin film was cured within 10 min. Moreover, the strain-induced elastic buckling instability for mechanical measurements test and the bulge test confirmed that the increase in the h-Urushiol content decreased the mechanical strength. Because the double bonds in the Urushiol side chain contribute to forming the highly cross-linked structure, the lack of double bonds in h-Urushiol resulted in the slow curing and low mechanical strength. Interestingly, the mechanical robustness started to increase over 80 mol % h-Urushiol. The saturated long alkyl side chain of h-Urushiol faced the surface, and the regular structure of the uniform side chain may improve the mechanical properties of the coated film. Our results will help to develop biomimetic catechol-based coatings
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spray assisted nanocoating of the biobased material Urushiol
Langmuir, 2015Co-Authors: Hirohmi Watanabe, Aya Fujimoto, Atsushi TakaharaAbstract:We have demonstrated the spray-assisted coating of the catechol derivative, Urushiol. Spraying a mixture of Urushiol and iron(II) acetate formed a uniform coating about 10 nm thick, as confirmed by AFM observations. XPS measurements revealed that various substrates, including polyolefins and thermosetting resins, were successfully coated with Urushiol. The coating showed good solvent tolerance and coating adhesion after baking at 100 °C for 10 min or after aerobic oxidation for several days. Interestingly, quartz crystal microbalance (QCM) measurements and strain-induced elastic buckling instability for mechanical measurements (SIEBIMM) revealed that density and Young’s modulus of the spray-assisted nanocoatings were higher than those of spray-coated samples. Moreover, the coating was uninvolved in physical properties except surface properties, as demonstrated by several experiments. Because Urushiol is a promising biobased material, our unique spray-assisted coating technique could provide a general appr...
Tetsuo Miyakoshi - One of the best experts on this subject based on the ideXlab platform.
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Development and Characterization of Laccol Lacquer Blended with Urushiol Lacquer
International Journal of Polymer Analysis and Characterization, 2014Co-Authors: Kenichiro Anzai, Bach Trong Phuc, Tetsuo MiyakoshiAbstract:A lacquer blending Urushiol and laccol was investigated. The blended lacquer with 30wt.% Urushiol and 100wt.% laccol has a good drying property and film hardness. 2-D-NMR and FD-MS measurements of the lacquer dimer showed that a transfer of radicals between Urushiol and laccol occurred during the enzymatic polymerization, and 4-4′ biphenyl, 4-6′ (4′-6), and 6-6 (6-6′) dibenzofuran structures were obtained.
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development of a fast drying lacquer based on raw lacquer sap
Progress in Organic Coatings, 2004Co-Authors: Rong Lu, Takahisa Ishimura, Sayoko Harigaya, Kisuke Nagase, Tetsuo MiyakoshiAbstract:Abstract A series of new lacquers, based on the raw lacquer sap that drying fast in the natural environment, has been developed using a repeated- kurome process. Fast drying occurred due to the repeated- kurome process from K-0 to K-4, and the 982 cm −1 for the dienes decreased and the 993 cm −1 for the trienes increased in the IR measurement. In addition, the polymerization of Urushiol by laccase was revealed for the first time by the repeated-time course of GPC measurements. The results suggest that the molecular weight of Urushiol was gradually increased by the repeated- kurome process, and the emulsion micelle in the raw lacquer decreased from 10 to 1 μm in the kurome lacquer. A lacquer based on raw lacquer that dries fast at room termperature and humidity can be obtained by stirring with additional moisture in the reaction vessel, the kurome process, with a decrease of the Urushiol monomer.
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lipoxygenase catalyzed polymerization of phenolic lipids suggests a new mechanism for allergic contact dermatitis induced by Urushiol and its analogs
Biochemical and Biophysical Research Communications, 2004Co-Authors: Zuyong Xia, Tetsuo Miyakoshi, Takashi YoshidaAbstract:Lipoxygenase was found to catalyze the oxidative polymerization of phenolic lipids containing a (Z,Z)-pentadiene in the side chain, the model compounds of Urushiol and its analog, yielding methanol-soluble and insoluble polymers. The structural analysis of the resulted polymers suggested that the polymerization occurred at both the phenol and the unsaturated side chain. The key step of the polymerization was the generation of the hydroperoxide at the unsaturated side chain by lipoxygenase. The decomposition of hydroperoxide and concomitant dehydrogenation of phenol ring catalyzed by lipoxygenase might produce radicals that could be coupled to form cross-linked polymers. This lipoxygenase-mediated reaction implies a new mechanism for contact allergy of Urushiol and its analogs.
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synthesis of Urushiol components and analysis of urushi sap from rhus vernicifera
Journal of Oleo Science, 2001Co-Authors: Yukio Kamiya, Tetsuo MiyakoshiAbstract:An efficient method for synthesizing unsaturated Urushiol components in urushi sap, was established, Wittig reaction of ylides derived from alkyl-and alkenyltriphenylphosphonium iodides, as side chain parts of Urushiol, with 3-(8-oxo-1-octyl) catechol diacetate or 3-(10-oxo-1-decyl) catechol diacetate, as aromatic part of Urushiol. Quantitative analysis of Urushiol components in the urushi sap was done using GC for comparison with synthesized Urushiol components as reference. In this manner, we proved the structures of most Urushiol components and established percentage compositions of Urushiols in the sap of Rhus vernicifera of Japan, Korea and China. (approximately 95%), by quantitative analysis of Urushiol derived from Rhus vernicifera, the most abundant constituent was triene Urushiol (approximately 71%) and the next abundant were mono (14-16%) and diene (5-8%) Urushiol. Content was found to depend on growth conditions of the Rhus vernicifera tree and on the particular season for obtaining sap.
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structural studies and polymerization mechanisms of synthesized lacquer films using two stage pyrolysis gas chromatography mass spectrometry
International Journal of Polymer Analysis and Characterization, 1998Co-Authors: Noriyasu Niimura, Tetsuo Miyakoshi, Jun Onodera, Tetsuo HiguchiAbstract:Abstract Two kinds of synthesized lacquer films were investigated and compared with a natural lacquer film using two-stage pyrolysis-gas chromatography mass spectrometry (Py-GC/MS). Monoenyl and saturated Urushiol were detected from the synthesized lacquer film by pyroly-sis at 400°C, as well as from the natural lacquer film. These are attributed to the terminal groups of the synthesized lacquer film. In addition, alkenylphenois. aikyiphenols, alkenes and alkanes were detected by pyrolysis at 500°C after pyioiysis at 400°C. as well as in the natural lacquer film. Some alkenes and alkanes have longer carbon chains than the side chains of synthesized Urushiol. The alkenylphenois and aikyiphenols are the pyrolysis products of the nucleus-side chain C-O coupling synthesized Urushiol polymers, and the alkenes and alkanes, whose carbon chains are longer than the side chains of synthesized Urushiol, are the pyrolysis products of autoxidative side chain-side chain C-C coupling synthesized Urushiol polymer. Based ...
Ki Tae Suk - One of the best experts on this subject based on the ideXlab platform.
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Probiotics (Lactobacillus rhamnosus R0011 and acidophilus R0052) Reduce the Expression of Toll-Like Receptor 4 in Mice with Alcoholic Liver Disease
2015Co-Authors: Meegun Hong, Ki Tae Suk, Soon Koo Baik, Myongjo Kim, Moon Young Kim, Sang Hak Han, Seung Woo Kim, Dong Joon Kim, Yeon Soo Kim, Young Lim HamAbstract:ObjectiveThe role of lipopolysaccharide (LPS) and toll-like receptor 4 (TLR 4) in the pathogenesis of alcoholic liver disease (ALD) has been widely established. We evaluated the biological effects of probiotics (Lactobacillus rhamnosus R0011 and acidophilus R0052), KRG (Korea red ginseng), and Urushiol (Rhus verniciflua Stokes) on ALD, including their effects on normal and high-fat diet in mice.MethodsOne hundred C57BL/6 mice were classified into normal (N) and high-fat diet (H) groups. Each group was divided into 5 sub-groups: control, alcohol, alcohol+probiotics, alcohol+KRG, and alcohol+Urushiol. A liver function test, histology, electron-microscopy, interleukin (IL)-1β, tumor necrosis factor (TNF)-α, IL-6, and IL-10, and TLR 4 were evaluated and compared.ResultsIn the N group, probiotics, KRG, and Urushiol significantly reduced levels of TNF-α (12.3±5.1, 13.4±3.9, and 12.1±4.3 vs. 27.9±15.2 pg/mL) and IL-1β (108.4±39.4, 75.0±51.0, and 101.1±26.8 vs. 162.4±37.5 pg/mL), which were increased by alcohol. Alcohol-induced TLR 4 expression was reduced by probiotics and Urushiol (0.7±0.2, and 0.8±0.1 vs. 1.0±0.3, p
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Cytokines in normal diet groups (A) and in high fat diet groups (B).
2015Co-Authors: Meegun Hong, Ki Tae Suk, Soon Koo Baik, Myongjo Kim, Moon Young Kim, Sang Hak Han, Seung Woo Kim, Dong Joon Kim, Yeon Soo Kim, Young Lim HamAbstract:Probiotics, KRG, and Urushiol are effective in the reduced pro-inflammatory cytokines. IL-10 levels were significantly higher in the HLL and HLK groups than in HL. TNF-α, tumor necrosis factor-α; IL, interleukin; N, normal diet group; L, H, high fat diet; alcohol; LL, alcohol+probiotics; LK, alcohol+KRG; LU, alcohol+Urushiol. * p
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TEM findings of small intestine (×20,000).
2015Co-Authors: Meegun Hong, Ki Tae Suk, Soon Koo Baik, Myongjo Kim, Moon Young Kim, Sang Hak Han, Seung Woo Kim, Dong Joon Kim, Yeon Soo Kim, Young Lim HamAbstract:Alcohol cause irregular and deteriorated microvilli (white arrow), however, more tufted microvilli (white arrowhead) were observed in the probiotics, KRG, and Urushiol groups. KRG, Korea red ginseng.
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Microscope findings of liver (A; H&E, ×200) and hepatitis activity garde (B).
2015Co-Authors: Meegun Hong, Ki Tae Suk, Soon Koo Baik, Myongjo Kim, Moon Young Kim, Sang Hak Han, Seung Woo Kim, Dong Joon Kim, Yeon Soo Kim, Young Lim HamAbstract:Mononuclear cells, favoring lymphocytes, are identified in the perivenular area (black arrow). Inflammatory cells are mildly decreased in the probiotics, KRG, and Urushiol groups. KRG, Korea red ginseng. * p < 0.05.
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Immunohistochemical findings (A; CD 45) and grade of CD 45 (B).
2015Co-Authors: Meegun Hong, Ki Tae Suk, Soon Koo Baik, Myongjo Kim, Moon Young Kim, Sang Hak Han, Seung Woo Kim, Dong Joon Kim, Yeon Soo Kim, Young Lim HamAbstract:Mononuclear cells, favoring lymphocytes, are identified in the perivenular area (black arrowhead). The cell count is mildly decreased in the probiotics, KRG and Urushiol groups. KRG, Korea red ginseng; CD 45, cluster of differentiation 45.
Aya Fujimoto - One of the best experts on this subject based on the ideXlab platform.
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biobased polymer coating using catechol derivative Urushiol
Langmuir, 2016Co-Authors: Hirohmi Watanabe, Aya Fujimoto, Jin Nishida, Tomoyuki Ohishi, Atsushi TakaharaAbstract:We have investigated the mechanism of the superior mechanical robustness of coated thin films of the catechol derivative Urushiol. We synthesized hydrogenated Urushiol (h-Urushiol) by hydrogenating the double bonds in the long alkyl side chain of Urushiol, and the physical properties of thin films of mixtures of Urushiol and h-Urushiol were evaluated. Atomic force microscopy observations revealed that these coated thin films have a homogeneous surface with no phase separation, regardless of the h-Urushiol content, arising from the similarity of the chemical structures. The films showed good adhesive properties because the adhesion originates from the catechol structure. In contrast, curing time depended strongly upon the h-Urushiol content. The curing of the h-Urushiol thin film took 12 h, whereas the Urushiol thin film was cured within 10 min. Moreover, the strain-induced elastic buckling instability for mechanical measurements test and the bulge test confirmed that the increase in the h-Urushiol content decreased the mechanical strength. Because the double bonds in the Urushiol side chain contribute to forming the highly cross-linked structure, the lack of double bonds in h-Urushiol resulted in the slow curing and low mechanical strength. Interestingly, the mechanical robustness started to increase over 80 mol % h-Urushiol. The saturated long alkyl side chain of h-Urushiol faced the surface, and the regular structure of the uniform side chain may improve the mechanical properties of the coated film. Our results will help to develop biomimetic catechol-based coatings.
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Biobased Polymer Coating Using Catechol Derivative Urushiol
2016Co-Authors: Hirohmi Watanabe, Aya Fujimoto, Jin Nishida, Tomoyuki Ohishi, Atsushi TakaharaAbstract:We have investigated the mechanism of the superior mechanical robustness of coated thin films of the catechol derivative Urushiol. We synthesized hydrogenated Urushiol (h-Urushiol) by hydrogenating the double bonds in the long alkyl side chain of Urushiol, and the physical properties of thin films of mixtures of Urushiol and h-Urushiol were evaluated. Atomic force microscopy observations revealed that these coated thin films have a homogeneous surface with no phase separation, regardless of the h-Urushiol content, arising from the similarity of the chemical structures. The films showed good adhesive properties because the adhesion originates from the catechol structure. In contrast, curing time depended strongly upon the h-Urushiol content. The curing of the h-Urushiol thin film took 12 h, whereas the Urushiol thin film was cured within 10 min. Moreover, the strain-induced elastic buckling instability for mechanical measurements test and the bulge test confirmed that the increase in the h-Urushiol content decreased the mechanical strength. Because the double bonds in the Urushiol side chain contribute to forming the highly cross-linked structure, the lack of double bonds in h-Urushiol resulted in the slow curing and low mechanical strength. Interestingly, the mechanical robustness started to increase over 80 mol % h-Urushiol. The saturated long alkyl side chain of h-Urushiol faced the surface, and the regular structure of the uniform side chain may improve the mechanical properties of the coated film. Our results will help to develop biomimetic catechol-based coatings
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spray assisted nanocoating of the biobased material Urushiol
Langmuir, 2015Co-Authors: Hirohmi Watanabe, Aya Fujimoto, Atsushi TakaharaAbstract:We have demonstrated the spray-assisted coating of the catechol derivative, Urushiol. Spraying a mixture of Urushiol and iron(II) acetate formed a uniform coating about 10 nm thick, as confirmed by AFM observations. XPS measurements revealed that various substrates, including polyolefins and thermosetting resins, were successfully coated with Urushiol. The coating showed good solvent tolerance and coating adhesion after baking at 100 °C for 10 min or after aerobic oxidation for several days. Interestingly, quartz crystal microbalance (QCM) measurements and strain-induced elastic buckling instability for mechanical measurements (SIEBIMM) revealed that density and Young’s modulus of the spray-assisted nanocoatings were higher than those of spray-coated samples. Moreover, the coating was uninvolved in physical properties except surface properties, as demonstrated by several experiments. Because Urushiol is a promising biobased material, our unique spray-assisted coating technique could provide a general appr...
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Spray-Assisted Nanocoating of the Biobased Material Urushiol
2015Co-Authors: Hirohmi Watanabe, Aya Fujimoto, Atsushi TakaharaAbstract:We have demonstrated the spray-assisted coating of the catechol derivative, Urushiol. Spraying a mixture of Urushiol and iron(II) acetate formed a uniform coating about 10 nm thick, as confirmed by AFM observations. XPS measurements revealed that various substrates, including polyolefins and thermosetting resins, were successfully coated with Urushiol. The coating showed good solvent tolerance and coating adhesion after baking at 100 °C for 10 min or after aerobic oxidation for several days. Interestingly, quartz crystal microbalance (QCM) measurements and strain-induced elastic buckling instability for mechanical measurements (SIEBIMM) revealed that density and Young’s modulus of the spray-assisted nanocoatings were higher than those of spray-coated samples. Moreover, the coating was uninvolved in physical properties except surface properties, as demonstrated by several experiments. Because Urushiol is a promising biobased material, our unique spray-assisted coating technique could provide a general approach for material-independent surface modification techniques that are environmentally sustainable
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Surface functionalization by decal-like transfer of thermally cross-linked Urushiol thin films.
ACS Applied Materials & Interfaces, 2014Co-Authors: Hirohmi Watanabe, Aya Fujimoto, Atsushi TakaharaAbstract:We have demonstrated surface functionalization through the decal-like transfer of thermally cross-linked Urushiol thin films onto various substrates. Tensile adhesive strength measurements showed that the film adheres strongly to the surface of various substrates including chemically inert materials, such as polyolefins and thermosetting resins, because of the properties of Urushiol. Furthermore, the highly cross-linked structure of Urushiol made the films mechanically robust. These two properties allowed the fabrication of practicable thin films for indirect surface modification. Actually, the robust thin film served as a scaffold for an Au thin film, which was then bound to various substrates. Surface-texturing of nanodecal was also demonstrated as an application aspects.
