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New Biodegradable and Thermoresponsive Polymers Based on Amphiphilic Poly(asparagine) Derivatives

Macromolecular Symposia 2007年第1期249-250卷

作者： Eiji Watanabe Naoki Tomoshige Hiroshi Uyama Chemical Process Group Process Technology Laboratory Mitsui Chemicals Inc. Sodegaura 299-0265 Japan Performance Design Group Material Science Laboratory Mitsui Chemicals Inc. Sodegaura 299-0265 Japan Department of Applied Chemistry Graduate School of Engineering Osaka University Suita 565-0871 Japan

New biodegradable and thermoresponsive polymers based on amphiphilic poly(asparagine) derivatives have been developed. They showed a sol-gel-sol phase transition. In particular, not only a phase transition behavior but also a lower critical solution temperature (LCST) was observed in the polymers with N,N -dimethylaminopropyl groups as the hydrophilic side chains. The LCST and a sol-gel-sol phase transition temperature could be precisely controlled by changing the composition ratio and kind of the hydrophobic and the hydrophilic groups of the side chains in the polymers. These polymers are expected to be applicable for controlled release of drugs, tissue engineering, and others.

关键词： biodegradable hydrogels poly(amino acid)s stimuli-sensitive polymers

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The Effect of Sparger Geometry on Gas Bubble Flow Behaviors Using Electrical Resistance Tomography

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Chinese Journal of Chemical engineering 2006年第1期14卷 127-131页

作者：靳海波 M. Wang R. A. Williams Department of Chemical Engineering Beijing Institute of Petrochemical Technology Beijing 102617 China School of Process Environmental and Material Engineering University of Leeds Leeds LS2 9JT UK

By electrical resistance tomography (ERT) the cross sectional profiles of gas hold-up in a φ56mm bubble column are obtained with four designs of gas sparger. The effect of sparger geometry on the bubble distribution is re-vealed by applying a sensitivity conjugated gradients reconstruction method (SCG). Experimental results show that over-all hold-up obtained by ERT is generally in good agreement with those measured with the pressure transducer and the ERT system produces informative evidence that the radial profiles of hold-up is very similar to the sparger design in the lower section of bubble column. Meanwhile, the rise velocity of bubble swarm and the Sauter mean bubble size are evaluated using ERT based on dynamic gas disengagement theory. The experimental results are in good agreement with correlations and conventional estimation obtained using pressure transmitter methods.

关键词： bubble column flow behavior electrical resistance tomography

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Cartesian cut-cell method with local grid refinement for wave computations

Cartesian cut-cell method with local grid refinement for wav...

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12th AIAA/CEAS Aeroacoustics Conference

作者： Popescu, Mihaela Tai, Cheng-Feng Shyy, Wei Department of Process and Technology SINTEF Material and Chemistry Trondheim 7465 Norway Department of Mechanical and Aerospace Engineering University of Florida Gainesville FL 32611 United States Department of Aerospace Engineering University of Michigan Ann Arbor MI 48109 United States Department of Process and Technology Sem Seelands vei 2 a Trondheim Norway AIAA United States Department of Mechanical and Aerospace Engineering

ISBN: (纸本)1563478099

Sound generation from a vibrating circular piston is a classical acoustic problem. The goal of this paper is to simulate numerically the sound radiation produced by oscillating baffled pistons, using both linear and nonlinear model, and to consider the interplay between wave propagation and geometric complexities. The linear solution, based on the linear Euler equations, will be compared to the Rayleigh integral approximation. The nonlinear solution, based on the Navier-Stokes equations, will be compared against linear model for low speed (less than 0.01 of sound speed). A main practical interest in this problem is to capture the behavior of the waves resulting from the source pistons with other solid objects or waves. The wave's properties in terms of frequency, amplitude and wavenumber are influenced by the initial frequencies and coordinates of the pistons, and the geometry. The wave equations in Cartesian coordinate with cut-cell and local grid refinement technique are employed along with the Optimized Prefactored Compact finite volume (OPC-fv) scheme for spatial discretization, the Low-Dispersion Low-Dissipation Runge-Kutta (LDDRK) scheme for time discretization. Problems for the waves around different geometries, and with varied frequencies and amplitudes are considered and presented.

关键词： Acoustic waves

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Corrigendum to “Electrochemical polymerization of pyrrole in supercritical carbon dioxide-in-water emulsion” [Polymer 47 (2006) 1547–1554]

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Polymer 2007年第9期48卷 2791-2791页

作者： Mitsutoshi Jikei Suguru Saitoh Hajimu Yasuda Hideaki Itoh Masato Sone Masa-aki Kakimoto Hideo Yoshida Department of Material-Process Engineering and Applied Chemistry for Environments Akita University Tegata Gakuen-machi Akita-shi Akita 010-8502 Japan Department of Organic and Polymeric Materials Chemistry Tokyo University of Agriculture and Technology Koganei-shi Tokyo 184-8588 Japan Department of Organic and Polymeric Materials Tokyo Institute of Technology Megoro-ku Tokyo 152-8550 Japan YP System Co. Ltd 5-33-4 Kumegawa-cho Higashimurayama-shi Tokyo 189-0003 Japan

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Photocatalytic decomposition of ethylene in a wire-net reactor

Photocatalytic decomposition of ethylene in a wire-net react...

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作者： Sugawara, Yasushi Sugawara, Katsuyasu Sugawara, Takuo Industrial Material Group Akita Prefectural Industrial Technology Center 4-11 Sanuki Arayamachi Akita Japan Dept. of Materials-process Engineering and Applied Chemistry for Environments Akita University 1-1 Gakuenmachi Tegata Akita Japan

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Simulation modeling of customized product family decision points and logistics

Simulation modeling of customized product family decision po...

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2006 IIE Annual Conference and Exposition

作者： Lu, Roberto F. Storch, Richard L. Commercial Airplanes Material and Process Technology Boeing Company Mail Code: 19-FA P.O. Box 3707 Seattle WA 98124-2207 United States Industrial Engineering University of Washington Box 352650 Seattle WA 98195-2650 United States

Long lead time customized products generally require product specific decisions from customers throughout different phases of the production system. In addition to the system integration plan, logistics plans also depend on the customization decisions. In order to have statistically predictable performance based on the roles and influence of all participants across different domains of production, systems, a simulation modeling method is employed to address some of the possible outcomes. The production system in this research contains partners across different continents, different manufacturing segments and with a very complex logistics system. Customer decision points and the individual production starting times for different interim, products have significant impacts on the productivity of the overall system. In other words, customization decisions can be made throughout the production process, but the timing of the decisions has a significant impact on productivity. Additionally, since the production system has widely varying starting times for different interim products, each supplier is at a different point on its improvement (learning) curve as the production system, operates. Other challenges in modeling this system are associated with the speed of customized process improvements, customer preferred configurations, logistics, and production rate management. This paper will address research into and findings from a simulation model of this integrated production system for customized products with specific consideration of these elements: customer product customization decision points, supplier related event management, component transportation logistics among key partners, the framework for simulation modeling, and improvement curve impacts among partners in the production system.

关键词： Production engineering

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Morphology of polyurethane flexible foam prepared using soybean oil derived polyol

Morphology of polyurethane flexible foam prepared using soyb...

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Society of Petroleum Engineers - 5th International Conference on Thermoplastic Foam, FOAMS 2006

作者： Zhang, Ling Jeon, Hyun K. Malsam, Jeff Herrington, Ron Macosko, Christopher W. Department of Chemical Engineering and Material Science University of Minnesota 421 Washington Avenue SE Minneapolis MN 55455 Process Solutions Technology Development Center Cargill Inc. 2301 Crosby Road Wayzata MN 55391 Ron Herrington Consultancy 2919 Country Road 510 Brazoria TX 77422

In this study three polyurethane (PU) flexible foams were prepared by using polyether polyol and by replacing 30% of the polyether polyol with soybean oil-derived polyol (SBOP) and styrene acrylonitrile (SAN) copolymer filled polyol. Scanning electron microscope, dynamic mechanical analysis (DMA), and small angle X-ray scattering (SAXS) were used to examine the cellular structure and the polymer morphology. Compared to the all petroleum-based PU foams, DMA of the SBOP-containing foam showed broader glass transition temperature accompanied by a more gradual decay of the storage modulus (G′) with temperature. The SAXS results exhibited a decrease in signal intensity as SBOP is incorporated into the foam, which corresponds to a decrease in electron density contrast between the hard and soft phases. Both behaviors observed in DMA and SAXS suggest an increased degree of phase mixing in SBOP-containing foam.

关键词： Foamed plastics

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Segmented polyurethane from soyoil polyols

Segmented polyurethane from soyoil polyols

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2006 AIChE Annual Meeting

作者： Zhang, Ling Jeon, Hyun K. Malsam, Jeff Herrington, Ron Macosko, Christopher W. Department of Chemical Engineering and Material Science University of Minnesota 421 Washington Avenue SE Minneapolis MN 55455 United States Process Solutions Technology Development Center Cargill Inc. 2301 Crosby Road Wayzata MN 55391 United States Ron Herrington Consultancy 2919 Country Road 510 Brazoria TX 77422 United States

ISBN: (纸本)081691012X

In this study three polyurethane (PU) flexible foams were prepared by using poly ether polyol and by replacing 30% of the polyether polyol with soybean oil-derived polyol (SBOP) and styrene acrylonitrile (SAN) copolymer filled polyol. Scanning electron microscope, dynamic mechanical analysis (DMA), and small angle X-ray scattering (SAXS) were used to examine the cellular structure and the polymer morphology. Compared to the all petroleum-based PU foams, DMA of the SBOP-containing foam showed broader glass transition temperature accompanied by a more gradual decay of the storage modulus (G) with temperature. The SAXS results exhibited a decrease in signal intensity as SBOP is incorporated into the foam, which corresponds to a decrease in electron density contrast between the hard and soft phases. Both behaviors observed in DMA and SAXS suggest an increased degree of phase mixing in SBOP-containing foam.

关键词： Glass transition

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DNA detection and characterization of nano magnetite powders synthesized by sonomechanical method

DNA detection and characterization of nano magnetite powders...

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IEEE Nanotechnology materials and Devices Conference (NMDC)

作者： Eung Kwon Kim Joon Tae Song Ki Chul Kim Yong Jun Jo Areum Han Se Chan Kang Jae Won Lee Young Sung Kim School of Information and Communication Engineering Sungkyunkwan University Suwon South Korea BK21 Physics Research Division Institute of Basic Science Sungkyunkwan University South Korea Sungkyunkwan University South Korea Gyeonggi Pharmaceutical Research Center South Korea Advanced Material Process of Information Technology Sungkyunkwan University South Korea

In order to detect DNA, we employed nano magnetite powders of Fe 3 O 4 . In XRD results, the nanoparticle was synthesized mainly in magnetite phase and also maghemite (r-Fe 2 O 3 ) phase was trivial portion. The surface morphology of the powders observed that the particle size was about 40 nm and did not change as varying annealing temperature. In agarose gel electrophoresis analysis, after bonding DNA, Fe 2 O 3 and Fe 3 O 4 nanopaticles showed the fixed state in the range of lane 2-4. But the mixed particles were very weak reaction when compared with Fe 3 O 4 . Additionally, Fe 3 O 4 presented the reaction of DNA in lane 5~7. From these results, we confirmed a chance of DNA detection by using the nanoparticle.

关键词： DNA Powders Iron X-ray scattering Surface morphology Annealing Temperature Electrokinetics Magnetic analysis Bonding

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Production and material performance of long - Strand wood composites

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Wood Research 2006年第3期51卷 37-50页

作者： Joščák, Tomáš Teischinger, Alfred Müller, Ulrich Mauritz, Raimund Doka Industrie GmbH Amstetten Austria Competence Center for Wood Composites and Wood Chemistry Kompetenzzentrum Holz GmbH St.-Peter-Strasse 25 A-4021 Linz Austria Institute of Wood Science and Technology Department of Material Sciences and Process Engineering University of Natural Resources and Applied Life Sciences Peter Jordan Strasse 82 A-1190 Vienna Austria Doka Industrie GmbH Reichsstrasse 23 A 3300 Amstetten Austria

In the last three decades a new group of engineered wood composites e.g. Scrimber, TimTek, Superposed Strand Timber, and Quetschholz has been developed. The basic idea of these wood composites was a new non-cutting technology to produce long strands with strict grain orientation. The strands were covered with glue, parallel aligned and pressed to high performance wood composites. This paper gives an overview of the different concepts of non-cutting strand production. In a second part of the paper the different products which have been produced from these long oriented strands will be presented. Comparing the properties of this new group of wood composites proves that they are able to compete with the mechanical performance and production costs of existing engineered wood products e.g. OSB (Oriented Strand Board), PSL (Parallel Strand Lumber) and, LSL (Laminated Strand Lumber). Despite the excellent mechanical properties the new group of wood composites show low dimensional stability which can mainly be attributed to the production of the strands.

关键词： Wood

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