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  • 1
    Electronic Resource
    Electronic Resource
    The effect of preparation process of PMDA-ODA-DR1 polyimide on its second harmonic generation characteristics (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 56 (1995), S. 1625-1634 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: In situ second harmonic generation (SHG) observation of PMDA-ODA-DR1 polyimide films prepared by different preparative procedures were studied to understand the effects of the residual acid and the imidization byproduct and the extent of imidization on the SHG characteristics of the PMDA-ODA-DR1 polyimides. PMDA-ODA-DR1 polyimides with or without removal of salt were also investigated to study the influence of remaining triethyl hydrogen ammonium chloride salt on the SHG characteristics and reliability of the polymers. A blue shift in the UV/vis spectrum during poling was observed for the low temperature-baked film, but did not occur for the high-temperature-baked film. Both high temperature imidization and removal of the byproduct organic salt did not only improve the poling efficiency of PMDA-ODA-DR1 polyimide as a SHG material, but also slowed down the relaxation of the film and made the film more reliable. © 1995 John Wiley & Sons, Inc.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070561213
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  • 2
    Electronic Resource
    Electronic Resource
    Morphological features of blown high-density polyethylene films (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 61 (1996), S. 1717-1729 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The blown films of high-density polyethylenes with unimodal and bimodal molecular weight distribution were prepared under several processing conditions, and their morphologies were extensively characterized. The high molecular weight tail (MW 〉 ∼ 106) of the molecular weight distribution seems to play a critical role on the morphology of blown highdensity polyethylene films irrespective of the molecular weight distribution mode of the resins. As the content of high molecular weight species increased, the tendency for high stress-crystallization increased and the network structure of lamellar stacks was better developed. The intercrystalline connectivity along the normal direction of lamellar stacks was higher than that along the transverse direction of lamellar stacks. © 1996 John Wiley & Sons, Inc.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Short chain branching distribution and thermal behavior of high density polyethylene (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 60 (1996), S. 2469-2479 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: High-density polyethylenes with unimodal and bimodal molecular weight distribution have been fractionated according to crystallizability using preparative temperature rising elution fractionation. The molecular structure and thermal properties of the fractions with their whole polymers have been characterized. The average short chain branching content of the fractions obtained ranged from 0 to 8 branches per 1000 carbon atoms while that of the whole polymers is about 2 branches per 1000 carbon atoms. The bimodal resins have a slightly higher frequency of short chain branch in higher molecular weight species than in those of the unimodal resins. The short chain branching distribution as well as the low molecular weight species in the fractions seem to be important parameters to determine thermal behavior of the fractions. The fractions with the short chain branching content above 3 branches per 1000 carbon atoms showed a significantly different thermal behavior from those with less than 3 branches per 1000 carbon atoms. © 1996 John Wiley & Sons, Inc.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Molecular relaxations in highly oriented polymer structuresWe thank Mrs. J. Cardinal for performing the DMTA measurements. [AMR120]. (1992)
    Weinheim : Wiley-Blackwell
    Advanced Materials 4 (1992), S. 215-220 
    Details
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19920040312
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  • 5
    Electronic Resource
    Electronic Resource
    Aligned aluminophosphate molecular sieves crystallized on floating anodized alutnina by hydrothermal microwave heating (1997)
    Weinheim : Wiley-Blackwell
    Advanced Materials 9 (1997), S. 1154-1157 
    Details
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19970091505
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  • 6
    Electronic Resource
    Electronic Resource
    Novel PPV derivatives emitting light over a broad wavelength rangeThis work was supported by the Korea Science and Engineering Foundation. (1997)
    Weinheim : Wiley-Blackwell
    Advanced Materials 9 (1997), S. 551-554 
    Details
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19970090706
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  • 7
    Electronic Resource
    Electronic Resource
    Blends of chlorinated isotactic polypropylene with poly(ethylene-co-vinyl acetate) I. Effect of component polymers composition on the blend miscibility (1988)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 164 (1988), S. 171-180 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Chlorierte isotaktische Polypropylene (CPP) mit verschiedenen Chlorgehalten wurden mit Poly(Ethylen-co-Vinylacetat)en (EVA) mit verschiedenen Vinylacetat (VA)-Gehalten gemischt. Die Polymermischungen wurden durch Filmgießen aus verdünnten THF-Lösungen hergestellt; die Verträglichkeit der Polymermischungen wurde durch eine einzige Glasübergangstemperatur identifiziert, die durch DSC und dynamisch-mechanische Messungen festgestellt wurde.Basierend auf den Verträglichkeitsdaten einer Vielzahl von CPP/EVA-Kombinationen wurde ein Verträglichkeitsplan aufgestellt, in dem das CO-Äquivalentgewicht (CO-EQW) gegen das Äquivalentgewicht des Chlors (Cl-EQW) aufgetragen wurde.Obwohl eine einander anziehende Wechselwirkung zwischen CPP und EVA in allen mischbaren und unverträglichen Mischungspaaren nachgewiesen werden konnte, konnte eine Mischbarkeit nur in einem relativ engen Bereich von C1-EQW ca. 65-100 und CO-EQW ca. 170-230 beobachtet werden.
    Notes: Chlorinated isotactic polypropylenes (CPP) having various chlorine contents were blended with poly(ethylene-co-vinyl acetate)s (EVA) having various vinyl acetate (VA) contents. The blends were made by casting films from dilute THF solutions and miscibility of the blends was identified by single glass transition temperature, which was confirmed by DSC and dynamic mechanical measurements. Based on the miscibility data from a large number of CPP/EVA combinations, a miscibility map was depicted where CO equivalent weight (CO-EQW) of EVA was plotted against chlorine equivalent weight (Cl-EQW) of CPP.Though an attractive interaction between CPP and EVA could be detected in all the miscible and immiscible blend pairs, miscibility of the CPP/EVA blends could solely be observed in a relatively narrow range of Cl-EQW ca. 65-100 and CO-EQW ca. 170-230.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1988.051640113
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  • 8
    Electronic Resource
    Electronic Resource
    Blends of chlorinated isotactic polypropylene with poly(ethylene-co-vinyl acetate) IIPart I, cf.1.. Phase studies of the miscible blends (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 165 (1989), S. 89-95 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Durch Messungen von Tg, Tm und Tc (Trübungspunkt) wurden Phasendiagramme der vier verträglichen Polymermischungen von chlorierten isotaktischen Polypropylenen (Chlorgehalt 39,2 (CPP-40) und 49,8 Gew.-% (CPP-50)) mit Poly(ethylen-co-vinylacetat)en (Vinylacetatgehalt 40 (EVA-40) und 45 Gew.-% (EVA-45)) untersucht. Von den vier Mischungspaaren war die Mischung von CPP-50 mit EVA-40 am besten verträglich.
    Notes: By measuring Tg, Tm and Tc (cloud point) phase diagrams for the four miscible blends of chlorinated isotactic polypropylenes (chlorine content 39.2 (CPP-40) and 49.8 wt.-% (CP-50)) with Poly(ethylene-co-vinyl acetate)s (vinyl acetate contents 40 (EVA-40) and 45 wt.-% (EVA-45)) were investigated. The blend of CPP-50 with EVA-40 was the most compatible of the four blend pairs.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051650108
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  • 9
    Electronic Resource
    Electronic Resource
    Urease immobilized polyethylene-g-acrylic acid membrane for urea sensor (1990)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 179 (1990), S. 149-156 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Eignung eines durch Gammastrahlen mit Acrylsäure gepfropften Polyethylens (PE-g-AA) als Tragermembran fur die Immobilisierung von Urease wurde untersucht. Die optimalen Immobilisierungsbedingungen und der Einfluß der physikalischen Eigenschaften des Tragermaterials auf die Aktivitat des immobilisierten Enzyms wurden ermittelt.Die Immobilisierung wurde mit einem wasserloslichen Carbodiimid (CMC) durchgefuhrt. Die Aktivitaten der Enzymmembranen sind sehr hoch und hangen, wie auch die Hydrophilie des Tragermaterials, vom Pfropfungsgrad ab. Ein aus der Enzymmembrane hergestellter Sensor detektiert Harnstoff im Konzentrationsbereich 60-400 ppm.
    Notes: A new type of polymer support for immobilizing urease was investigated. The starting copolymers which grafted acrylic acid onto polyethylene (PE-g-AA) were prepared via gamma ray irradiation induced grafting under controlled conditions by postirradiation procedures. The optimum conditions for coupling urease to PE-g-AA were established and the physical properties of the support affecting the immobilized enzyme activity were studied.A water soluble carbodiimide (CMC) was used as a condensing agent to immobilize urease. The activities of the resulting enzyme membranes were very high. The hydrophilicity of the support and the activity of the enzyme membrane were proportional to the degree of grafting. Its linear detecting range was 60-400 ppm.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1990.051790111
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  • 10
    Electronic Resource
    Electronic Resource
    Preparation and uranyl ion adsorptivity of macroreticular chelating resins containing a pair of neighboring amidoxime groups in a monomeric styrene unit (1996)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 239 (1996), S. 121-132 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Durch Reaktion eines chlormethylierten Styrol/Divinylbenzol-Copolymeren mit Natriumcyanid wurde ein cyanmethyliertes Styrol/Divinylbenzol-Copolymeres hergestellt. Ein makroretikuläres Harz auf Polystyrolbasis, das zwei benachbarte Nitrilgruppen pro Monomereinheit enthielt, wurde durch die Reaktion des cyanmethylierten Copolymeren mit 3-Chlorpropionitril unter Phasentransferbedingungen hergestellt. Durch Reaktion mit Hydroxylamin wurde ein Chelatharz mit zwei Amidoximgruppen pro Monomereinheit erhalten. Das Chelatharz zeigte hohes Adsorptionsvermögen für Uranylionen. Es wurde festgestellt, daß das Harz ein wirksames Adsorbens für andere Schwermetallionen wie z. B. Hg2+ und Pb2+ ist.
    Notes: A cyanomethylated styrene-divinylbenzene copolymer was prepared by the reaction of a chloromethylated styrene-divinylbenzene copolymer with sodium cyanide. A polystyrene-based macroreticular resin containing a pair of neighboring nitrile groups in each monomeric styrene unit was obtained from the reaction of the cyanomethylated copolymer with 3-chloropropionitrile under phase transfer conditions. The resin was reacted with hydroxylamine to afford a chelating resin containing a pair of neighboring amidoxime groups in each monomeric styrene unit. The chelating resin showed high adsorption capacity for uranyl ions. It was found that the resin was an effective adsorbent for other heavy metal ions such as Hg2+ and Pb2+.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1996.052390111
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