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  • Polymer and Materials Science  (5)
  • 1990-1994  (3)
  • 1970-1974  (2)
  • 1960-1964
  • 1
    Electronic Resource
    Electronic Resource
    Direct visualization of synthetic cellulose formation via enzymatic polymerization using transmission electron microscopy (1994)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 195 (1994), S. 1319-1326 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The process of synthetic cellulose formation in an acetonitrile-buffer solvent system by enzymatic polymerization of β-cellobiosyl fluoride monomer using cellulase as a catalyst was visualized by transmission electron microscopy. Synthetic cellulose could be observed as soon as 30 s after initiation of the polymerization. A micellar phase separation occurred at the initial stage of the reaction. Irregular aggregates of cellulose were formed at the boundary of the micellar particles, suggesting that the interface is the site of polymerization. The cellulose product after treatment with hot surfactant solution was strongly labeled with cellobiohydrolase I-gold complexes, indicating that the produced polymer is cellulose. The electron diffraction pattern of the product showed the typical pattern of crystal structure of cellulose II.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1994.021950416
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  • 2
    Electronic Resource
    Electronic Resource
    A quantitative adhesion test for thin polymer films on silicon substrates (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 43 (1991), S. 1287-1292 
    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 standard 90° peel test was modified in order to apply it to testing adhesion of thin polymer films to surfaces of silicon substrates, such as the silicon nitride passivation layer used in our solid-state chemical sensors. The goal of this task was to develop a procedure for testing adhesion of both dry and wet films, which would yield repeatable, quantitative results quickly, and with simple sample preparation. It is important to produce valid comparisons of adhesion both over variations of a given polymer composition, and between films made of dissimilar polymer matrices. The method described herein could be applied to adhesion testing of a wide variety of thin polymer layers to solid surfaces.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070430709
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  • 3
    Electronic Resource
    Electronic Resource
    Crosslink density of elastomers. A new gas-chromatographic method (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 18 (1974), S. 1079-1082 
    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 crosslink density of small microtomed samples of rubber vulcanizates has been determined using a gas-chromatographic method for estimating the amount of solvent in the swollen rubber. The method may be used for determining the variation in crosslink density through thick rubber articles, for determining the change in crosslink density after aging service, or, for the investigation of rubber bonds and interfaces.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1974.070180409
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  • 4
    Electronic Resource
    Electronic Resource
    Bioelectrocatalysis and diffusion kinetics glucose oxidase: Glucose reaction using a water-soluble 1,1′-dimethylferrocene-2-hydroxypropyl-β-cyclodextrin complex (1994)
    Weinheim : Wiley-Blackwell
    Electroanalysis 6 (1994), S. 391-396 
    Details
    ISSN: 1040-0397
    Keywords: 1,1′-dimethylferrocene-2-hydroxypropyl-β-cyclodextrin ; Inclusion complex ; Mediator ; Glucose ; Glucose oxidase ; Diffusion ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mediation of the glucose oxidase (GOx): glucose reaction by 1,1′-dimethylferrocene (DMF) solubilized in 2-hydroxypropyl-β-cyclodextrin (hpβCD) was studied. Cyclic voltammetry (CV) was used to examine the effects of complexation with hpβCD on the oxidation potential of DMF through the analysis of half-wave potentials. This indicated a one-to-one complex between DMF and hpβCD, with a formation constant of (1.2 ± 0.3) × 103 M-1 The working potential for electrodes using the mediator complex could be reduced by minimizing the hpβCD concentration, though a lower limit of 2.5 mM was observed for the 0.5 mM DMF solutions used in this work, below which the DMF became insoluble, and its electrochemistry was not well behaved.Cyclic voltammetry measurements at different scan rates were used to determine kinetic-parameters, resulting in a second-order rate constant for the reaction of oxidized DMF with reduced GOx of 3.4 × 104 M-1 s-1 to 1.9 × 104 M-1 s-1 for solutions containing 4 mM to 10 mM hpβCD. These values are on the order of one-quarter the literature value for free DMF and are in the range reported for ferrocene, indicating that the complexed DMF is able to function as an efficient mediator. The rate constant determined for 2.5 mM hpβCD was anomalously high and probably indicated insolubility of the DMF at this hpβCD concentration. A rate constant versus the hpβCD concentration plot was used as an indication of the lower limit of hpβCD concentration at which reproducible results could be obtained.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140060506
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  • 5
    Electronic Resource
    Electronic Resource
    Strength and toughness of elastomers at low temperatures (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 10 (1972), S. 327-340 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.110100502
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