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  • 1
    Electronic Resource
    Electronic Resource
    Effect of matrix graft modification using acrylic acid on the PP/Mg(OH)2 composites and its possible mechanism (2000)
    Springer
    Journal of polymer research 7 (2000), S. 15-20 
    Details
    ISSN: 1572-8935
    Keywords: Polypropylene ; Acrylic acid ; Matrix graft modification ; Magnesium hydroxide ; Flame retardant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The matrix graft modification using an acrylic acid (AAc) was employed on the polypropylene/Mg(OH)2 flame-retardant composite. The graft modification of PP matrix was carried out via an in-situ reactive extrusion by a twin-screw extruder. The tensile strength of the composites was analyzed using an equation developed by Pukanszky from which both matrix tensile strength σ0 and interfacial adhesion strength were found to be increased. The enhancement of σ0 is due to the intermolecular crosslinking of PP by AAc grafting. This crosslinking causes increases of tensile strength, Young’s modulus, impact resistance, and thermal resistance, but decreases the elongation at break of the composites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10965-006-0099-7
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  • 2
    Electronic Resource
    Electronic Resource
    Copolymerization of N-(4-carboxyphenyl)maleimide with acrylonitrile and the properties of its membrane (2000)
    Springer
    Journal of polymer research 7 (2000), S. 251-255 
    Details
    ISSN: 1572-8935
    Keywords: N-(4-Carboxyphenyl)maleimide ; Acrylonitrile ; Monomer reactivity ratios ; Q, e Scheme ; Pervaporation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract N-(4-Carboxyphenyl)maleimide (N-4-CPMI, M1) was copolymerized with acrylonitrile (AN, M2) to prepare the copolymer. The monomer reactivity ratios and Alfrey-Price Q, e values were determined as r1 = 0.56, r2 = 0.84, Q 1 = 2.0, Q 2 = 0.6 and e 1 = 2.06, e 2 = 1.2. The membrane of copolymer containing 0.25% CPMI had a good tensile property (67.3 MPa). The 0.75 mole% membrane had an excellent selectivity factor (α = 45.3).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10965-006-0127-7
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of surface treatment of carbon fiber on the electrical and mechanical properties of high-impact polystyrene composite (1995)
    Springer
    Journal of polymer research 2 (1995), S. 83-89 
    Details
    ISSN: 1572-8935
    Keywords: Carbon fiber ; Polyurethane ; Coupling agent ; High impact polystyrene ; Electromagnetic interference ; Shielding effectiveness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Carbon fiber (CF), PU(polyurethane)-coated carbon fiber (CF-PU) and Ni-coated fiber (NCF) treated with a coupling agent (CA) were used to prepare composites for high impact polystyrene (HIPS) by melt blending. The optimum concentration of the titanate CA is 1.5 phf (per hundred parts of filler) when coupled with the carbon fibers. A composite prepared by adding a CA directly into the matrix which was then reinforced with fibers was investigated for comparison. These composites were evaluated for electromagnetic interference shielding effectiveness, dispersion, and adhesion between the polymer and the filler by means of scanning electron microscopy (SEM). The addition of CA generally improved the shielding effectiveness; this is especially apparent when the matrix was pretreated with CA before compounding with the fibers. The tensile properties were also improved upon CA addition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01493207
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  • 4
    Electronic Resource
    Electronic Resource
    Preparation and properties of maleimide capped polyurethane/allyl novolac resin AB crosslinked polymers (1997)
    Springer
    Journal of polymer research 4 (1997), S. 177-182 
    Details
    ISSN: 1572-8935
    Keywords: AB crosslinked polymer ; Polyurethane ; Maleimide ; Allyl novolacs ; Morphology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract To improve the miscibility and tensile strength of the ABCPs material, we conducted a study in which maleimide end-capped polyurethane was prepared from the PU prepolymer and maleimide by reacting 4,4′-diphenylmethane diisocyanate (MDI) with poly(tetramethylene oxide) (PTMO), whose molecular weights were Mn=600∼700 (PA650), Mn=900∼1050 (PA1000) and Mn=1900∼2100 (PA2000). AB crosslinked polymers (ABCPs), synthesized from the PU prepolymer and the novolac resin, were studied. The study confirmed the occurrence of phase mixing. Further investigation through dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC) and transmission electron microscopy (TEM) revealed that the tensile strength and phase mixing were,improved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10965-006-0023-1
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  • 5
    Electronic Resource
    Electronic Resource
    Preparation and properties of electroconductive acrylonitrile grafted poly(vinyl alcohol) modified nembrane (1994)
    Springer
    Journal of polymer research 1 (1994), S. 25-34 
    Details
    ISSN: 1572-8935
    Keywords: Graft copolymer ; Poly(vinylalcohol) ; Acrylonitrile graft copolymer ; Electroconductivity ; Photoconductivity ; Metal chelated film
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract PVA-g-AN was prepared, the yield and the graft efficiency were determined. A PVA-g-AN metal chelated film was then prepared by mixing and soaking methods, separately. After treatment with NaBH4 aqueous solution or H2S gas, the electrical and photoconductive properties were investigated. In order to increase the adsorption amount for metal ion in the soaking method, the amidoxime group was introduced into the PVA-g-AN film in various conditions. The proposed structures of the metal chelated PVA-g-AN films were also studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01378591
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis and properties of simultaneous interpenetrating networks based on poly(urethane-epoxy)/allyl novolac resin (1997)
    Springer
    Journal of materials science 32 (1997), S. 4985-4990 
    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 Poly (urethane-epoxy)/allyl novolac resin simultaneous interpenetrating networks (SINs) were prepared by crosslinking urethane-epoxy adduct with diamino diphenylmethane (DDM) and allyl novolac resin simultaneously. An urethane-epoxy adduct was synthesized by terminating the urethane prepolymer composed of 4,4′-diphenyl methane diisocyanate (MDI) and poly (tetramethylene oxide) (PTMO), whose molecular weight range falls in 600–700 (UT1), 900–1050 (UT2) and 1900–2100 (UT3) with glycidol (GL). The allyl novolac resin was derived from novolac type phenolic resin by substituting the hydroxy group on the aromatic ring with the allyl group. The thermal, mechanical and dynamical characteristics of these SINs were measured by differential scanning calorimetry (DSC), Instron tester and dynamical mechanical analysis (DMA), and correlated well enough with morphological observations from transmission electron microscopy (TEM). All these SINs exhibit a two-phase structure and a reasonable explanation is provided for the correspondence of the phase mixing and the specific mechanical properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018688610705
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