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  • 1
    Electronic Resource
    Electronic Resource
    A computer model for the gel effect in free-radical polymerization (1983)
    s.l. : American Chemical Society
    Macromolecules 16 (1983), S. 348-357 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00237a002
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  • 2
    Electronic Resource
    Electronic Resource
    Comparison of serum protein removal in haemodialysis therapy by partly protein-permeable haemodialysers
    Amsterdam : Elsevier
    Journal of Chromatography B: Biomedical Sciences and Applications 428 (1988), S. 25-33 
    Details
    ISSN: 0378-4347
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0378-4347(00)83887-6
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of urethanes on base-catalyzed epoxy reaction (1995)
    Springer
    Journal of polymer research 2 (1995), S. 115-120 
    Details
    ISSN: 1572-8935
    Keywords: Aryl-connected carbamate (Ar-carbamate) ; Alkyl-connected carbamate (Al-carbamate) ; Epoxide group ; Tertiary amine
    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 effect of carbamate (urethane) groups on the curing reaction of an epoxy catalyzed by tertiary amine was studied by infrared (IR) and differential scanning calorimetry (DSC) analysis. It was found that the aromatic-connected carbamate (Ar-carbamate) accelerated the consumption rate of epoxy in the epoxy/tertiary amine/Ar-carbamate reaction system, where the tertiary amine and Ar-carbamate was found to form an active complex with stoichiometric ratio in the curing reaction. However, under the introduction of aliphatic-connected carbamate (Al-carbamate) into the reaction system, no complex formed with the tertiary amine during the reaction and therefore no acceleration in the reaction rate was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01493211
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis of flexible polyarylate by interfacial polycondensation (1994)
    Springer
    Journal of polymer research 1 (1994), S. 1-6 
    Details
    ISSN: 1572-8935
    Keywords: Polyarylate ; Bisphenol-A ; Terephthalic acid ; Ethylene glycol ; Interfacial polycondensation
    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 Products with hydroxyl ends were synthesized from the esterification of bisphenol-A, terephthalic acid and ethylene glycol. These ester products were then used for synthesis of polyarylate by interfacial polycondensation. Not only the relative concentrations of reactants for esterification but also the conditions for interfacial polycondensation, such as the monomer ratio between two phases and the reaction time, play significant roles in affecting the properties of final products. Under proper synthesis conditions, the polyarylate formed could possess equivalent thermal characteristics and much higher impact strength in comparison with unmodified polyarylate due to the incorporation of flexible aliphatic segments from ethylene glycol. X-ray diffraction showed the existence of aliphatic segments would induce small degree of orderly alignment locally in structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01378588
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  • 5
    Electronic Resource
    Electronic Resource
    Miscibility behaviors in poly(butylene terephthalate)/polyarylates based on Bisphenol A copolymer blends (1999)
    Springer
    Journal of polymer research 6 (1999), S. 27-33 
    Details
    ISSN: 1572-8935
    Keywords: Miscibility ; Spherulitic growth rate ; Mean field theory ; Interaction strength ; PBT ; PAr
    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 miscibility and spherulitic growth rates of Poly(butylene terephthalate) with Polyarylate based copolymer blends, PBT/PAr, were investigated using differential scanning calorimetry (DSC) and polarized optical microscopy (POM). Five kinds of polyarylate copolymers based on Bisphenol A with different molar ratios of isophthalic/terephthalic acids were prepared via. interfacial polymerization. The mean field theory of polymer/copolymer blend system was introduced to explain the miscibility behaviors; this theory could predict miscibility in PBT/PAr blends qualitatively. It was found that the segmental interaction strength of PAr with PBT followed the order of PAr(T-100) 〉 PAr(I-100) 〉 PAr(I25-T75) 〉 PAr(I75-T25) 〉 PAr(I50-T50). The physical origin of this phenomenon is very complex. One of possible reasons for these behaviors may arise from the conformations of PAr(T-100) and PAr(I-100) segments. The preferred conformation of PAr(T-100) was crank-shaft and the preferred conformation of PAr(I-100) was helix type. However, the conformation of PBT in crystalline state was nearly linear. It was also shown that the segmental interaction strength of the blend influenced the spherulitic growth rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10965-006-0068-1
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  • 6
    Electronic Resource
    Electronic Resource
    Chemorheology of epoxy resin (1994)
    Springer
    Journal of materials science 29 (1994), S. 887-893 
    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 A secondary hydroxyl group containing epoxy resin was reacted and cross-linked with polyurethane (PU). This PU-cross-linked epoxy resin was cured with a tertiary amine and the viscosity and dynamic mechanical properties were determined by a cone-and-plate rheometer. A dual Arrhenius viscosity model was modified to predict the viscosity profile with time before gelation during non-isothermal curing, and the calculated values coincided with the experimental data. The activation energy of this system (NCO/OH ratio=30 mol%) calculated by the modified model was 13kcal mol−1 for the initial region, and 16.8 kcal mol−1 for the final region. After gelation, the dynamic complex modulus was correlated to the reaction kinetics according to the rubber elasticity theory, and the activation energy calculated was 5.2 kcal mol−1. These activation energies are all lower than those of the unmodified epoxy resin system. Consequently, the reaction rate of the PU-cross-linked epoxide system was less affected by temperature than that of the unmodified epoxide system. It was also found that the rate of increase of viscosity and dynamic moduli decreased with increasing PU content. The gelling point was estimated by rheological measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351407
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of polyurethane structure on mechanical properties of nylon-66/polyurethane blends (1994)
    Springer
    Journal of polymer research 1 (1994), S. 337-344 
    Details
    ISSN: 1572-8935
    Keywords: Nylon-66/Polyurethane blends ; Mechanical property ; 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 A polyamide (nylon-66, N66) was blended with a series of polyurethanes (PU) based on different polyols or chain extenders. The effects of PU structure and content on the mechanical properties of the blends were investigated. The morphology of the polyblends was examined by scanning electron microscopy. The Izod impact strength of the blends increased with increasing PU content and showed a maximum value at the composition of 15 wt % PU. The effects of moisture content on the mechanical properties of the blends were also investigated. It was found that the water-toughened N66 could be further toughened by the addition of PU. Polyester-type PU rather than polyether type PU was recommended for the toughening of N66 because the blends containing the former showed higher tensile strength and Izod impact strength except at very low moisture (0.3 wt %) content. Carboxyl groups was introduced into the molecular chains of PU by using dimethylol propionic acid as chain extender replacing part of 1,4-butanediol. The blends containing PU with carboxyl groups showed a lower Izod impact strength than those without carboxyl groups in the structure of PU.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01378766
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  • 8
    Electronic Resource
    Electronic Resource
    Chemorheology of epoxy resin Part I epoxy resin cured with tertiary amine (1994)
    Springer
    Journal of materials science 29 (1994), S. 721-727 
    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 Epoxy resin was cured with a tertiary amine. The viscosity and dynamic mechanical properties during the curing reaction were measured by a cone-and-plate rheometer. A dual Arrhenius viscosity model was modified to predict the viscosity profile before gelation during the non-isothermal curing. The viscosity profile coincided with the experimental data. The activation energy of this system calculated using the modified model was 19.8 kcal mol−1 for the first region, and 17.3 kcal mol−1 for the second region. After gelation, the dynamic complex modulus was related to the reaction kinetics according to the rubber elasticity theory, and the activation energy was 15.3 kcal mol−1. Furthermore, the gelling point can be estimated from the rheological measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00445985
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  • 9
    Electronic Resource
    Electronic Resource
    Interpenetrating polymer networks of polyurethane and maleimide-terminated polyurethane for biomedical applications (1996)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 7 (1996), S. 265-272 
    Details
    ISSN: 1042-7147
    Keywords: polyurethane ; bismaleimide ; biomaterial ; blood compatibility ; surface property ; mechanical property ; degree of compatibility ; 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: Interpenetrating polymer networks (IPNs) of polyurethane (PU) and maleimide-terminated polyurethane (UBMI) were prepared by using a simultaneous polymerization technique. The effects of the UBMI molecular weight and amounts of the UBMI in the IPNs on the mechanical properties, dynamic mechanical properties, degree of compatibility, water absorption, surface properties and dynamic thrombosis were investigated. Bulk structure and surface properties were analyzed in order to correlate their blood compatibility. The IPNs exhibited a higher ultimate tensile strength especially when the UBMI with short soft chains was introduced. The heterogeneous characteristics were found for the IPNs when longer soft segment chains were incorporated in the PU component polymer. The presence of hydrophilic/hydrophobic alternative microdomains on the IPN surface was proposed to be the reason for good blood compatibility. The degree of compatibility, compositions of each domain and content of each domain in the matrix were calculated and correlated with the blood compatibility.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Kinetics of curing reaction of epoxide catalyzed by tertiary amine (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 50 (1993), S. 1099-1106 
    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 kinetic study of the curing reaction of epoxide catalyzed by tertiary amine was carried out through thermal analysis of the reaction by differential scanning calorimetry (DSC). Using infrared spectroscopy (IR) and neutron magnetic reasonance (NMR) analysis, a reaction mechanism for this reaction was proposed. The reaction proceeded to anionic polymerization. An autocatalytic reaction was induced at high concentration of the tertiary amine catalyst. © 1993 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070500618
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