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Application of Ultraviolet Photografting technology to Acrylamide/ Polyethylene to Improve the Interfacial Adhesion of Polyethylene/Unsaturated Polyester Resin Composites

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Journal of Applied polymer Science 2009年第5期111卷 2507-2517页

作者： Hsien-Tang, Chiu Zhi-Jian, Shong School of Polymer Engineering National Taiwan University of Science and Technology 43 Keelung Road Section 4 Taipei Taiwan Graduate School of Polymer Green Building Materials Research Center 43 Keelung Road Section 4 Taipei Taiwan

This study was divided into two sections. In the first part, we used ultraviolet (UV) rays in the wavelength range 300-400 nm to remove the hydrogen atom from polyethylene (PE) and worked with a hydrophilic monomer to complete the grafting action. In the second part, we used the best conditions derived from the previous film grafting and applied them to fibers to achieve excellent adhesion for application in composite materials. For the handling process of the PE film, we initially used acrylamide (AM) as the monomer and then added acetone and benzophenone (BP) to form a reactive solution for the advanced photografting process. In general, the optimum concentrations of the monomer solutions obtained from the photografting of PE films were 2 mol/L of AM and 0.2 mol/ L of BP. The UV irradiation time was fixed at 30 min. The optimum grafting conditions achieved in the first part of this research were applied in the photografting process for the PE fiber bundles in the second part. The unsaturated polyester (UP) resins were spread over the outer surfaces of the modified fibers. This was done to strengthen and increase the interface between the UP resins and the modified PE fiber. During the curing experiment of the grafted fiber bundles in the resin coatings, the best material quality was obtained under the following conditions: hardener content = 0.85% (relative to the UP resin weight), oven temperature = 80-C, and time frame = 5 h. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci 111: 2507-2517, 2009.

关键词： Fibers

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Characterisation of pectin-calcium-gels: Influence of pectin methoxylation properties

Characterisation of pectin-calcium-gels: Influence of pectin...

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2007 14th Gums and Stabilisers for the Food Industry Conference

作者： Fraeye, I. Vandevenne, E. Duvetter, T. Loey, A. Van Moldcnacrs, P. Hendrickx, M. Department of Microbial and Molecular Systems Laboratory of Food Technology Katholieke Universiteit Leuven Kasteelpark Arenberg 22 B-3001 Leuven Belgium Department of Chemical Engineering Applied Rheology and Polymer Processing Section Katholieke Universiteit Leuven Willem de Croylaan 46 B-3001 Leuven Belgium

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Synthesis of Low Silicon SAPO-34

Synthesis of Low Silicon SAPO-34

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第十一届全国青年催化学术会议

作者： A.Izadbakhsh F.Farhadi F.Khorasheh S.Sahebdelfar M.Asadi Department of Chemical and Petroleum Engineering Sharif University of Technology Iran Department of Chemical and Petroleum Engineering Sharif University of Technology Iran Department of Chemical and Petroleum Engineering Sharif University of Technology Iran Catalyst Research Section Polymer and Petrochemical Research Center Tehran Iran Catalyst Research Section Polymer and Petrochemical Research Center Tehran Iran

Catalytic conversion of methanol to olefins(MTO)has received much attention *** alumino phosphates are one of the promising molecular sieves[2]and SAPO-34is an important catalyst and lower catalyst acidity is favorabl... 详细信息

关键词： SAPO-34,MTO,Molecular sieve,Light olefins,Acidity

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The synthesis and characterization of organic-inorganic hybrid molecularly imprinted polymer binding cholesterol

The synthesis and characterization of organic-inorganic hybr...

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Transactions - 7th World Biomaterials Congress

作者： Lin, Chin I. Huang, Yuan Chang Lee, Y.D. Polymer Technology Department Union Chemical Laboratories Section 2 321 Kuang Fu Road Hsinchu 300 Taiwan Department of Chemical Engineering National Tsing Hua University Hsinchu 300 Taiwan

ISBN: (纸本)1877040193

Transparent and monolithic, cholesterol imprinted (CHO-ICPS)-TEOS derieved hybrid MIP were synthesized using sol-gel process. The monomer-template complex (CHO-ICPS) was prepared by the reaction of 3-isocyanato propyltriethoxysilane (ICPS) with cholesterol (CHO) in tetrahydrofuran. It was found that the protection of surface hydroxyl groups with trimethyl silyl groups increased the hydrophobic nature of MIPs and prevented the non-specific adsorption of templates. The results show that organiv-inorganic hybrid MIPs can be effectively utilized as a stationary phase of column chromatography and also for biosensor applications.

关键词： Cholesterol

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TEXTURE CHARACTERISTICS OF ALLERGENIC POLLENS

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Journal of Aerosol Science 2004年 35卷 S1005-S1006页

作者： L.C. JUANG C.H. LUO J.J. LIAW M.I. LIN Y.S. LEE Department of Environmental Engineering Hung-Kuang University 34 Chung-Chie Road Taichung Taiwan Department of Fiber and Polymer Engineering National Taiwan University of Science and Technology 43 Keeking Road Section 4 Taipei Taiwan

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Mechanism of the immobilization of surfactants on polymeric surfaces by means of an argon plasma treatment: Influence of the chemical structure of surfactant and substrate

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Journal of polymer Science 2000年第11期36卷

作者： J. P. Lens J. G. A. Terlingen G. H. M. Engbers J. Feijen Department of Chemical Engineering Section Polymer Technology and Biomaterials and Institute for Biomedical Technology (BMTI) University of Twente P.O. Box 217 7500 AE Enschede The Netherlands

In this article, a study on the mechanism of the immobilization of surfactants on polymeric surfaces by means of an argon plasma treatment is described. The unsaturated surfactant sodium 10-undecenoate [C11(:)] and the saturated surfactant sodium dodecanoate (C12) were immobilized on poly(ethylene) (PE), poly(propylene) (PP), and poly( cis -butadiene) (PB) surfaces. This was accomplished by treating polymeric substrates that were coated with C11(:) or C12 with an argon plasma. Derivatization X-ray Photoelectron Spectroscopy (XPS) and Static Secondary Ion Mass Spectrometry (SSIMS) showed that during the plasma treatment surfactants were covalently coupled to the polymeric surfaces. The chemical structure of both the surfactant and the polymeric substrate influenced the immobilization efficiency. At an optimal treatment time of 5 s, about 28 and 6% of the initial amount of carboxylate groups in the precoated C11(:) and C12 layer, respectively, was retained at the PE surface. The immobilization efficiencies of C11(:) and C12 on PP were about 20 and 9%, respectively. The immobilization efficiency of C11(:) and C12 on PB were both about 7%. The results obtained in this study indicate that the immobilization proceeds via a radical mechanism. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 1829–1846, 1998

关键词： surface modification argon plasma treatment poly(ethylene) poly(propylene) poly(cis-butadiene) carboxylic acid groups XPS SSIMS

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In‐line viscosity fuzzy control

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Journal of Applied polymer Science 2000年第7期79卷

作者： Shih‐Hsuan Chiu Sheng‐Hong Pong Department of Fiber and Polymer Engineering National Taiwan University of Science and Technology 43 Keelung Road Section 4 Taipei 10672 Taiwan Republic of China

A fuzzy control strategy on viscosity of a polymeric melt during the extruding processes is proposed to ensure producing the quality‐consistent end products. Because the viscosity model in the control system varies with respect to different conditions of the system command (e.g., screw speed), we focus on using a fuzzy controller accomplished with a fuzzy modeling technique to solve the model‐variant viscosity control system. Also, system stability analysis is presented. According to the simulation and the implementation results, better performances and a suitable using method are concluded. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 1249–1255, 2001

关键词： fuzzy controller fuzzy modeling viscosity in‐line extrusion

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Effect of temperature on styrene emulsion polymerization in the presence of sodium dodecyl sulfate. II†

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Journal of polymer Science 2000年第9期38卷

作者： Ignac Capek Shi-Yow Lin Tien-Jung Hsu Chorng-Shyan Chern Polymer Institute Slovak Academy of Sciences 842 36 Bratislava Slovakia Department of Chemical Engineering National Taiwan University of Science and Technology 43 Keelung Road Section 4 Taipei 106 Taiwan

The batch emulsion polymerization kinetics of styrene initiated by a water-soluble peroxodisulfate at different temperatures in the presence of sodium dodecyl sulfate was investigated. The curves of the polymerization rate versus conversion show two distinct nonstationary-rate intervals and a shoulder occurring at a high conversion, whereas the stationary-rate interval is very short. The nonstationary-state polymerization is discussed in terms of the long-term particle-nucleation period, the additional formation of radicals by thermal initiation, the depressed monomer-droplet degradation, the elimination of charged radicals through aqueous-phase termination, the relatively narrow particle-size distribution and constant polydispersity index throughout the reaction, and a mixed mode of continuous particle nucleation. The maximum rate of polymerization (or the number of polymer particles nucleated) is proportional to the rate of initiation to the 0.27 power, which indicates lower nucleation efficiency as compared to classical emulsion polymerization. The low activation energy of polymerization is attributed to the small barrier for the entering radicals. The overall activation energy was controlled by the initiation and propagation steps. The high ratio of the absorption rate of radicals by latex particles to the formation rate of radicals in water can be attributed to the efficient entry of uncharged radicals and the additional formation of radicals by thermally induced initiation. © 2000 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 38: 1477–1486, 2000

关键词： emulsion polymerization styrene ionic emulsifier kinetics

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On the emulsion polymerization of styrene in the presence of a nonionic emulsifier

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Journal of polymer Science 2000年第23期37卷

作者： Shi-Yow Lin Ignac Capek Tien-Jung Hsu Chorng-Shyan Chern Department of Chemical Engineering National Taiwan University of Science and Technology 43 Keelung Road Section 4 Taipei 106 Taiwan Polymer Institute Slovak Academy of Sciences 842 36 Bratislava Slovakia

The batch emulsion polymerization kinetics of styrene (St) initiated by a water-soluble peroxodisulfate in the presence of a nonionic emulsifier was investigated. The polymerization rate versus the conversion curves showed two nonstationary rate intervals, two rate maxima, and Smith–Ewart Interval 2 (nondistinct). The rate of polymerization and number of nucleated polymer particles were proportional to the 1.4th and 2.4th powers, respectively, of the emulsifier concentration. Deviation from the micellar nucleation model was attributed to the low water solubility of the emulsifier, the low level of the micellar emulsifier, and the mixed modes of particle nucleation. In emulsion polymerizations with a low emulsifier concentration, the number of radicals per particle and particle size increased with increasing conversion, and the increase was more pronounced at a low conversion. By contrast, in emulsion polymerizations with a high emulsifier concentration, the number of radicals per particle decreased with increasing conversion. This is discussed in terms of the mixed models of particle nucleation, the gel effect, and the pseudobulk kinetics. The formation of monodisperse latex particles was attributed to coagulative nucleation and droplet nucleation for the polymerizations with low and high emulsifier concentrations, respectively. The effects of the continuous release of the emulsifier from nonmicellar aggregates and monomer droplets, the close-packing structure of the droplet surface, and the hydrophobic nature of the emulsifier on the emulsion polymerization of St are discussed. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 4422–4431, 1999

关键词： emulsion polymerization styrene nonionic emulsifier kinetics

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Thermal stability of P(HB‐co‐HV) and its blends with polyalcohols

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Journal of Applied polymer Science 2000年第13期77卷

作者： V. P. Cyras A. Vázquez Ch. Rozsa N. Galego Fernández L. Torre J. M. Kenny Research Institute of Material Science and Technology INTEMA Juan B. Justo 4302 7600 Mar del Plata Argentina Laboratory of Polymers Materials and Reagents Institute Havana University Havana City 10400 Cuba Advanced Material Laboratory Polymer Section North Fluminense State University Campos R. J. Brazil Engineering Faculty Perugia University Loc. Pentima bassa 21 51000 Terni Italy

The thermal stability of poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyvalerate) [P(HB‐ co ‐HV)] and its blends with poly(propylene glycol)s (PPGs) and castor oil (CO) is reported. The study includes the determination of the degradation kinetics of these materials and the analysis of the effects of the degradation on the mechanical properties and crystallization behavior. Spectroscopy ( 1 H‐NMR, FTIR), differential scanning calorimetry (DSC), thermogravimetry, and tensile testing techniques are used for the experimental analysis. A chain‐scission degradation mechanism is confirmed by the formation of vinyl groups. Two temperature ranges are investigated. In the range closest to the melting point, 100–200°C, where the blend does not exhibit weight reduction, a fast and sensible loss of molecular weight and tensile strength was detected. The second temperature range, 200–400°C, is characterized by mass loss by pyrolysis. In this range, different kinetic models of the degradation process are proposed. Polyalcohol addition produces opposite effects, while the addition of PPG enhances the degradation of P(HB‐ co ‐HV). When CO is added, the thermal stability of the blend increases. Mechanical properties of the blends before and after degradation were determined. The tensile modulus increases at the first step of degradation and decreases with the degradation time. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 2889–2900, 2000

关键词： thermal stability degradation kinetics polyhydroxyalkanoates blends

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