POLYMERS Vol.59　No.8 August 2010

 

POLYMERS　Vol.59　No.8
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COVER STORY
Microreactor Technology as an Innovative Polymer Production Process
Growing Polymers: A Personal Account
Training for Three Years Later Taichi IKEDA
<Abstract> In my research carrier, I have always encouraged myself by a Japanese proverb “Training for three years later” meaning that today's training will lead to great achievement after some years.
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Save the Earth with “Growing” Rubber Hisakatsu HAMA
<Abstract> Using the precisely designed synthetic rubber as material of tyre is one of the solutions to save the earth from air pollution by reducing the fuel consumption.
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COVER STORY: Highlight Reviews
Controlled Polymerizations Using Microreactors Aiichiro NAGAKI and Jun-ichi YOSHIDA
<Abstract> Polymer synthesis is one of the most fascinating fields in the application of flow microreactor systems. There have been a great number of reports on the use of flow microreactor systems for the additional polymerization including cationic polymerization, anionic polymerization, radical polymerization and the ring-opening polymerization. This article provides a brief outline of polymer synthesis using flow microreactors with emphasis on controllability of polymerization.
Keywords: Microreactor / Fast Mixing / Temperature Control / Residence Time Control / Controlled Polymerization
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Polymer Beads Production Using Microreactor Toru TORII
<Abstract> This paper reports on polymer beads production using droplet formation in microchannel technique and microreactor. This technique has the following characteristics like, for example, monodisperse droplets production (CV < 5%), the wide control of diameter of the droplets, the very high formation speed of several thousand per second. Droplets are produced at T junction and cross junction. For the normal beads production, droplets were formed in 128 parallelized microchannels with a production rate of 320 (g/h) and a CV < 2%. Janus beads were also produced in microchannel. Core-shell structured beads were made using double emulsion formation technique. This technique has potential to produce functional beads in microreactors.
Keywords: Janus Beads / Core-Shell Structured Beads / Microchannel / Droplet Formation
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Fabrication and Manipulation of Organic Materials by Using MEMS Daisuke KIRIYA and Shoji TAKEUCHI
<Abstract> Recently, microfabrication of biological and synthetic materials have attracted much attention by using microdevices. These microdevices are fabricated by using a technique, termed MEMS (Micro Electro Mechanical Systems). This review introduces recent advances of fabrication and manipulation techniques of polymer, supramolecular and biological materials by using MEMS devices.
Keywords: MEMS / Biomaterial / Supramolecular Hydrogel / Tissue Engineering
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Development of Solid-Phase Catalyst-Installed Microflow Reactors and Their Application to Cross-Coupling Reactions Yoichi M. A. YAMADA
<Abstract> The development of catalyst-immobilized microflow reactors and their application to cross-coupling and so forth are introduced. For installation of immobilized catalysts, packing methods in a microreactor, a chemical modification method at the wall of a microreactor, and our catalytic membrane installation method at the interface of laminar flow in a microreactor are described.
Keywords: Microreactor / Microflow / Catalysts / Convolution / Organic Syntheses / Monolith / Microtube
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COVER STORY:Topics and Products
Controllable Ring-Opening Polymerization in Microreactor Masaya MIYAZAKI and Hideaki MAEDA
<Abstract> We used a microfluidic system for polymerization of amino acid N-carboxyanhydride. The microreactor produced polymers with a narrow molecular weight distribution. Also, the Mn of the polymer produced using the microreactor was simply governed by the flow rate. These results indicated that the microreactor is a useful tool for ring-opening polymerization reactions.
Keywords: Microreactor / Micromixer / Ring-Opening Polymerization / N-Carboxyanhydride / Polyamino Acid
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Butadiene Polymerizations Using Microreactors Akira MIYAZAWA
<Abstract> Microreactor-assisted activation of titanocenes with methylaluminoxane resulted in an active homogenous polymerization catalyst for 1,3-butadiene. The micro flow system, composed of several types of microreactors, was able to promote several reaction steps like activation, initiation, propagation and termination within one process.
Keywords: Microreactor / Micro Flow System / Polybutadiene / Living Polymerization
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Synthesis of Functionalized Organic Compounds by Use of a Microreactor Akihiro ORITA and Junzo OTERA
<Abstract> Compaction of a multi-step organic synthesis is one of the practical technologies for the realization of effective and environmentally benign synthetic processes because the whole procedure can be carried out by using a microreactor. Herein are described the compaction of a synthetic process and the connected organic synthetic steps by use of a microreactor.
Keywords: Microreactor / Sulfone / Acetylene / One-pot / Antimicrobial Agent
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Twisting Ball Electronic Paper Display Youichi TAKIZAWA and Takanori TAKAHASHI
<Abstract> The twisting ball display has been known as the first developed electronic paper. However, it is extremely difficult to produce the particles suitable for this device. We succeeded in developing a new manufacturing method for Janus beads set in the twisting ball display by applying the droplet formation in microchannel technique.
Keywords: Janus Beads / Droplet Formation / Microchannel
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Front-Line Polymer Science
Folding Manipulation for Functional Biopolymer Design Naohiko SHIMADA and Atsushi MARUYAMA
<Abstract> Folding of biomolecules such as proteins or nucleic acids is crucial for their functions. Recently, design of functional peptides and proteins on the basis of structure prediction has been reported. Nucleic acids are also utilized to design functional materials with well-characterized nano-order structures. Novel materials that change their structures and thereby function upon external stimuli have been also reported. Riboregulators or DNA nanomachines change the structure by external stimuli such as pH change, light irradiation or addition of ligand and subsequently act as smart molecules. Chaperones are proteins that assist biopolymer folding. Artificial chaperons are designed and are applied to control protein and nucleic acid folding and functions.
Keywords: Folding / Protein / Nucleic Acid / Bimolecular Fluorescence Complementation / Aptamer / Artificial Chaperon
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