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  • 1
    Electronic Resource
    Electronic Resource
    The switch-type humidity sensing properties of polyacrylic acid and its copolymers (2000)
    Springer
    Journal of materials science 35 (2000), S. 2005-2008 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In this paper, switch-type humidity sensors based on PAA (polyacrylic acid) and its copolymers were examined. The humidity sensing properties of these polymers, such as hysteresis, response time, water resistivity and long-term stability were investigated. The factors which influence the humidity sensors' inflection point were investigated experimentally as well. The results show that, the inflection point of the humidity sensors varies with the content of crosslinking agent and the sample composition. In particular, humidity sensors based on Sample E and B show good property and stability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004787007579
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  • 2
    Electronic Resource
    Electronic Resource
    Electrorheological suspensions (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 41 (1996), S. 363-367 
    Details
    ISSN: 0959-8103
    Keywords: electrorheological fluid ; polyaniline ; electroresponsive fluid ; electroviscous material ; suspension ; 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 electrorheological properties of polyaniline suspensions are typical of most electrorheological systems and are a function of many parameters such as suspension concentration, applied field strength and the relative permittivity of the particles. When only one parameter is varied, the suspensions' electrorheological effects increase with increasing concentration of dispersed phase, field strength and particle relative permittivity. The rheograms of the suspensions at different field strengths and concentrations have been studied. The dependence of the dynamic yield stress on particle concentration has also been determined.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of transitional metal ions on lyotropic liquid crystals of hydroxyethyl cellulose acetate in N,N-dimethylformamide (1996)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 7 (1996), S. 693-696 
    Details
    ISSN: 1042-7147
    Keywords: transitional metal ions ; liquid crystal ; complex formation ; hydroxyethyl cellulsoe acetate ; 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
    Notes: The influence of inorganic salts on the formation of lyotropic liquid crystals of hydroxyethyl cellulose acetate (HECA) in N,N′dimethylformamide (DMF) was studied. In the presence of CaCl2, an inorganic salt of a principal group metal, the solution of HECA/DMF/CaCl2 was a biphasic system. The temperature of the transformation from the liquid crystalline phase to the isotropic one increased with adding CaCl2 because local HECA concentration increases in the HECA/DMF phase. When CuCl2 or CoCl2, inorganic salts of transitional metals, was added, the solutions were monophasic systems and the complexes of HECA with Cu2+ or Co2+ were formed in solutions, which results in the increase of the temperature of the transfomation from the liquid crystalline phase to the isotropic one.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    A study of pyridinium-type functional polymers. I. Preparation and characterization of soluble pyridinium-type functional polymers (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 62 (1996), S. 2247-2255 
    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: Copolymerization of 4-vinylpyridine (4VP) with styrene (St) was performed in ethanol using 2,2′-azobisisobutyronitrile (AIBN) as an initiator, and then a random copolymer P(4VP-St) was obtained. A soluble pyridinium-type polymer containing N-benzyl-4-vinylpyridinium bromide [Q-P(4VP-St)], was prepared by quaternization of P(4VP-St) with benzyl bromide (BzBr). The structures of P(4VP-St) and its quaternized product Q-P(4VP-St) were identified by FTIR. The 4VP content in P(4VP-St) and the pyridinium group content (Cq) in Q-P(4VP-St) were determined by nonaqueous titration and argentometry, respectively. The molecular weight of p(4VP-St) was characterized by intrinsic viscosity. In addition, the charge density σ of the soluble pyridinium-type polymers was measured by colloid titration, and the mathematical relation between σ and Cq was established as follows: σ = -0.090 + 0.942 Cq. A preliminary investigation was made into the viscosity behavior and electroconductivity of the Q-P(4VP-St)/polar solvent system. © 1996 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Electrorheological properties of chitin suspensions (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 60 (1996), S. 2159-2164 
    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: Electrorheological suspensions are suspensins of solid particles whose rheological behavior can be strongly modified by the application of an electric field, In this article, the electrorheological properties of suspensions containing chitin particles (and its derivative -  carboxylmethyl chitosan particles) in silicone oil are reported for a range of suspension weight concentrations, applied field strengths, shear rates, etc. In these suspensions, glycerin was used as an activator. The adsorbed amount of glycerin, one of the electrorheological parameters, was also studied experimentally. The ER effect of the chitin suspension reaches the maximum at about 11% of weight concentration. The dependence of the experimentally determined dynamic yield stress on particle concentration and field strength is found to be similar to that reported for other systems. The dynamic yield stress is found to increase with the particle concentration and the applied electric field strength. © 1996 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Study of PVB aggregation process by electron microscopy (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 32 (1994), S. 1657-1660 
    Details
    ISSN: 0887-6266
    Keywords: poly(vinyl butyral)(PVB) ; aggregation ; electron microscopy ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The structure of aggregates formed from poly(vinyl butyral) (PVB) in tetrahydrofuran (THF) was studied by transmission electron microscopy (TEM). We have found that the primary associated particles are nearly spherical and, as the association advances, the particles lengthen. Eventually aggregates branch to form a three-dimensional network. The bulk PVB was investigated by scanning electron microscopy (SEM). We have found that the bulk PVB grains are aggregates of the particles the shape and dimension of which are similar to those of the primary associated particles formed in PVB solution. © 1994 John Wiley & Sons. Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1994.090320909
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  • 7
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    Mechanical properties of an ideal electrorheological fluid (1998)
    Elsevier
    Details
    Publication Date: 1998-11-01
    Print ISSN: 0038-1098
    Electronic ISSN: 1879-2766
    Topics: Physics
    Published by Elsevier
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  • 8
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    Preparation and biodegradability of polystyrene having pyridinium group in the main chain (1999)
    Elsevier
    Details
    Publication Date: 1999-09-01
    Print ISSN: 0014-3057
    Electronic ISSN: 1873-1945
    Topics: Chemistry and Pharmacology , Physics
    Published by Elsevier
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  • 9
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    Heat transfer enhancement in a converging passage with discrete ribs (1996)
    Elsevier
    Details
    Publication Date: 1996-05-01
    Print ISSN: 0017-9310
    Electronic ISSN: 1879-2189
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Elsevier
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