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Effectiveness of Talc Filler on Thermal Resistance of Recycled PET Blends

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Advances in Materials Physics and Chemistry 2013年第8期3卷 327-331页

作者： kazushi yamada Supaphorn Thumsorn Kyoto Institute of Technology Kyoto Japan Rajamangala University of Technology Thanyaburi Pathum Thani Thailand

In general, high mechanical properties such as higher impact strength and thermal resistance are required for injection molded applications. Recycled PET (RPET) is well known to exhibit brittle behavior in the presence of notches and indicated the low heat distortion temperature. Therefore, we tried to improve the toughness and thermal resistance properties of RPET by incorporating E-GMA, talc filler and engineering plastics as an impact modifier and talc to increase the rigidity and heat distortion temperature of RPET. As a result, these blends with E-GMA exhibited significantly higher stiffness and strength especially with increasing E-GMA content. In addition, these blends with talc filler indicated the high heat distortion temperature due to the increase of the crystalinity of RPET blends. Therefore, it was found that talc played an important role in enhancing the heat resistance of RPET.

关键词： Recycled PET Injection Moldings Talc Heat Distortion Temperature

Study on Properties of Silver Powder for Maki-e

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Materials Sciences and Applications 2015年第1期6卷 1-8页

作者： Chieko Narita Yutaro Shimode kazushi yamada Department of Advanced Fibro-Science Kyoto Institute of Technology Kyoto Japan Future Applied Conventional Technology Center Kyoto Institute of Technology Kyoto Japan

Maki-e is a traditional Japanese decorative technique that uses the natural lacquer Urushi and metal powders. In 2014, there exist only two companies that manufacture silver powder for the purpose of Maki-e, and this study focuses on comparing the powders manufactured by them. Gloss and color of each silver powder were measured after Maki-e decoration was finished, and EDS (energy-dispersive X-ray spectroscopy) was used to determine the differences in their chemical composition. In addition, to verify the effect of polishing, residual gloss after sulfuration and polishing was measured. The study revealed that the shapes of the silver powders (Maru-fun, No. 1) manufactured by the two companies are different and it affects the occupancy rate of Urushi and powder, which in turn affects their gloss and color. Wakou silver has a very strong resistance to sulfuration;however, owing to its Pd content, its chroma is much lower than that of other powders. It was shown that sulfuration on powder surface can be removed by polishing irrespective of the shape and chemical composition ratio of the particles.

关键词： Urushi Natural Lacquer Maki-e Silver Powder Energy-Dispersive X-Ray Spectroscopy

Study on Characteristics of Gold Powder with Round Shape for Maki-e

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Materials Sciences and Applications 2015年第10期6卷 841-849页

作者： Chieko Narita Yutaro Shimode kazushi yamada Department of Advanced Fibro-Science Kyoto Institute of Technology Kyoto Japan Faculty of Cultural Studies Kyoto Sangyo University Kyoto Japan

Maki-e is a traditional Japanese decorative technique that uses the natural lacquer Urushi and metal powders. Currently, there exist only two companies that manufacture metal powder for the purpose of Maki-e, and this research focuses on comparing the material characteristics of the gold powders with round shape manufactured by them. EDS (energy-dispersive X-ray spectroscopy) analysis, image analysis of particle shape before and after Maki-e processing, and color analysis of samples after Maki-e processing were carried out in this research. The study revealed that current gold powders with round shape had almost the same content ratio regardless of the manufacturing company and the powder diameter. In addition, spherical shape and irregular shape were observed in any gold powders, and the aggregates were observed in powder with increasing the powder diameter, while the shape of the aggregates differed with manufacturing companies. Therefore, it was indicated that the aggregates in the powder made by Asano Co., Ltd. had an influence on the particle diameter and its deviation after Maki-e processing. Moreover, the powder in Urushi resin has an influence on the Maki-e appearance because there is a color difference in polished powder, powder in Urushi resin, and Urushi resin.

关键词： Urushi Natural Lacquer Maki-e Gold Powder with Round Shape Traditional Crafts

The Relationship between Bulk Property and Property Distribution in Thin-Wall Injection Molded PP at Different Molecular Weight and Molecular Weight Distribution

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Advances in Materials Physics and Chemistry 2016年第1期6卷 1-8页

作者： Keisuke Maeda Koji yamada kazushi yamada Masaya Kotaki Hiroyuki Nishimura Department of Advanced Fibro Science Kyoto Institute of Technology Kyoto Japan Osaka Municipal Technical Research Institute Osaka Japan Center for Fiber and Textile Science Kyoto Institute of Technology Kyoto Japan Kaneka US Material Research Center Kaneka Americas Holding Inc. TX USA

Thin-wall injection molded parts have been paid much attention to the lightweight saving from viewpoints of natural resources saving. In the injection molding, skin-core structure can be found in the parts. This skin-core structure affects the property of completed injection molding parts (bulk property) even if in thin-wall injection molding. However, there is a few research about the relationship between bulk property and internal property distribution in the injection molding specimen. In this study, thin-wall injection molded parts of polypropylene (PP) were prepared by 4 different molecular weight and molecular weight distribution to reveal the relationship between bulk property and property distribution. These characteristics were investigated by using tensile test, fracture toughness characterized by Essential Work of Fracture (EWF) method for bulk property and film tensile test by sliced sample for tensile property distribution. The property distribution test results revealed that the highly bulk property sample had thicker highly mechanical property layer on its surface.

关键词： Molecular Weight Molecular Weight Distribution Fracture Toughness Property Distribution Thin-Wall Injection Molding

Effect of Molecular Weight and Molecular Distribution on Skin Structure and Shear Strength Distribution near the Surface of Thin-Wall Injection Molded Polypropylene

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Open Journal of Organic Polymer Materials 2016年第1期6卷 1-10页

作者： Keisuke Maeda Koji yamada kazushi yamada Masaya Kotaki Hiroyuki Nishimura Department of Advanced Fibro-Science Kyoto Institute of Technology Kyoto Japan Osaka Municipal Technical Research Institute Osaka Japan Center for Fiber and Textile Science Kyoto Institute of Technology Kyoto Japan Kaneka US Material Research Center Kaneka Americas Holding Inc. College Station TX USA

In this study, the relationship between skin structure and shear strength distribution of thin-wall injection molded polypropylene (PP) molded at different molecular weight and molecular distribution was investigated. Skin-core structure, cross-sectional morphology, crystallinity, crystal orientation, crystal morphology and molecular orientation were evaluated by using polarized optical microscope, differential scanning calorimeter, X-ray spectroscopic analyzer and laser Raman spectroscopy, respectively, while the shear strength distribution was investigated using a micro cutting method called SAICAS (Surface And Interfacial Cutting Analysis System). The results indicated that the difference of molecular weight and molecular weight distribution showed own skin layer thickness. Especially, high molecular weight sample showed thicker layer of the lamellar orientation and molecular orientation than low molecular weight sample. In addition, wide molecular distribution sample showed large crystal orientation layer.

关键词： Polypropylene Thin-Wall Injection Molding Molecular Weight and Molecular Weight Distribution Skin-Core Structure Shear Strength Distribution

Effect of Different Eggshell Powder on Appearance of Eggshell Maki-e

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Materials Sciences and Applications 2013年第2期4卷 138-144页

作者： Yutaro Shimode Chieko Narita Atsushi Endo kazushi yamada Department of Advanced Fibro-Sci- ence Kyoto Institute of Technology Kyoto Japan Department of Advanced Fibro-Sci- ence Kyoto Institute of Technology Kyoto Japan. Department of Traditional Arts and Crafts Kyoto College of Arts and Crafts Kyoto Japan

The Maki-e technique with eggshell powder is one of techniques of Japanese traditional Urushi (Japanese lacquer) crafts. However, this technique is relatively new in the history of Maki-e, and there are no prior researches in terms of materials, structure, and properties. In this research, therefore we have aimed to evaluate the relationship between the eggshell powder sizes, dispersion, and color shade in Maki-e with eggshell powder. The difference between hen’s and quail’s eggshell characteristics and the effect of their powder particle size on appearance of eggshell Maki-e were discussed on the basis of the results of the particle size, circularity, particle number, and RGB value. As a result, it was found that the occupancy of the eggshell powder on the surface depends on not particle number but the particle size, whereas the whiteness of both eggshell powders depends on the particle size.

关键词： Urushi (Japanese Lacquer) Maki-e Eggshell Powder Traditional Crafts

Synthesis of Polysilanes Using Mg and Lewis Acid and the Consideration of This Reaction Mechanism

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Materials Sciences and Applications 2015年第6期6卷 576-590页

作者： Hiroaki Murase Masayuki Sugimoto Hiroyuki Nishimura kazushi yamada Osaka Gas Co. Ltd. Osaka Japan Advanced Fibro-Science Kyoto Institute of Technology Kyoto Japan

Reduction of dichlorosilanes with Mg metal in the presence of LiCl and Lewis acid such as FeCl2 or ZnCl2 was found to be the highly practical method for the synthesis of polysilanes (PS). This method is so useful and practical that PS can be prepared by stirring dichlorosilanes at room temperature. This method was successfully applied for the synthesis of various types of PS having a linear structure, a cyclic structure and silane-styrene copolymers as another type of PS. The structure of the reaction intermediates was also analyzed. At the initiation stage the results of FD-MS (Field desorption mass spectrometry) and GPC (Gel permeation chromatography) showed that linear oligomers were mainly formed by stepwise reactions, and then the high polymers and cyclic oligomers were formed in parallel.

关键词： Polysilane Magnesium Lewis Acid Catalysts

Development of Cockleshell-Derived CaCO<sub>3</sub>for Flame Retardancy of Recycled PET/Recycled PP Blend

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Materials Sciences and Applications 2011年第2期2卷 59-69页

作者： Supaphorn Thumsorn kazushi yamada Yew Wei Leong Hiroyuki Hamada 不详

Recycled polyethylene terephthalate (RPET) and recycle polypropylene (RPP) blends filled with a renewable filler, i.e. cockleshell-derived CaCO3 (CS) were prepared as an environmental friendly thermoplastic composite. The effects of CS particle size and content on thermal stability, mechanical performance and flame retardant properties of the blends were investigated. Thermogravimetric analysis was performed to elucidate the thermal decomposition kinetics of the filled composites. The iso-conversion of the Flynn-Wall-Ozawa was developed by the second order polynomial function for thermal oxidative degradation of the blends while peak derivative temperature from the Kissinger method was able to verify the mechanism of degradation in these blends. The results indicated that both CS and commercial grade CaCO3 improved thermal stability and enhanced the stiffness as well as impact performance of the blends. However, this could only be achieved when high filler content was present in the RPET/RPP blends.

关键词： Cockleshell Aragonite CaCO3 Thermal Decomposition Kinetic Polymer Blend Flame Retardancy

Study on the Appearance and Peel Strength of Byakudan-Nuri Works

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Materials Sciences and Applications 2014年第2期5卷 81-85页

作者： Chieko Narita Atsushi Endo Yutaro Shimode kazushi yamada Department of Advanced Fibro-Science Kyoto Institute of Technology Kyoto Japan Kyoto Research Institute of Natural Lacquer Cultural Properties Kyoto Japan

This paper focuses on Byakudan-nuri, one of the traditional decoration techniques of Japanese Urushi (Urushi natural lacquer) crafts. Works produced by Byakudan-nuri express a unique luster color owing to painting gold or silver leaves along with highly transparent Urushi. The specific problem of Byakudan-nuri is the exfoliation of Urushi off the metal leaf surface, to solve a lot of repair work which is done nowadays. For Byakudan-nuri, silver leaf is preferred to a gold leaf. This paper tries to clarify the influence of the different kinds of metal leaves on the appearance and peel strength of works of Byakudan-nuri and, moreover, to elucidate the reason why silver leaf has been used more frequently for Byakudan-nuri until now. It was found out that the reason for the more frequent use of silver leaf in Byakudan-nuri is that silver does not seem to affect the appearance and peel strength in works produced by this technique.

关键词： Urushi (Urushi Natural Lacquer) Gold Tooling Byakudan-Nuri Traditional Crafts