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  • Wiley-Blackwell  (4)
  • 1990-1994  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and study of some newer polyamides for semipermeable membrane (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 44 (1992), S. 1383-1388 
    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: A series of novel polyamides was prepared by low temperature solution polycondensation of N-(p/m-aminobenzoyl aminoacetyl)-N'-(4/3-aminobenzoyl) hydrazine with different diacid chlorides in dry N,N-Dimethylacetamide (DMAC). The properties of the polyamides for membrane processing were studied with the help of infrared spectra, inherent viscosity, differential thermal, and thermogravimetric analysis. The inherent viscosities were measured in concentrated sulfuric acid at 25±5°C and were in the range of 0.35-0.89 dL/g. The thermogravimetric data in air indicate that the initial decomposition temperature was in the range of 175-200°C. The polymer melt temperature (Tm) and glass transition temperature (Tg) were in the range of 230-450°C and 153.3-300°C, respectively.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070440810
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  • 2
    Electronic Resource
    Electronic Resource
    Graft copolymerization of poly(butyl methacrylate) onto wool in the presence of air and nitrogen atmosphere. I (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 40 (1990), S. 1425-1431 
    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: Poly(butyl methacrylate) (PBMA) was grafted onto wool in the presence of air and nitrogen atmosphere using potassium persulphate (KPS) and thioacetic acid (TAA) as redox pair under different reaction conditions. The percentage grafting and efficiency were compared. The graft copolymer was characterized by scanning electron micrograph, thermogravimetry, and molecular weight.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070400901
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  • 3
    Electronic Resource
    Electronic Resource
    Protolytic equilibria of several 4-acyl-substituted 1-phenyl-3-methylpyrazol-5-ones in dioxane-water mixtures (1991)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 4 (1991), S. 667-674 
    Details
    ISSN: 0894-3230
    Keywords: Organic Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Thermodynamic proton ionization constants, TpKa, of several 4-acyl-substituted pyrazol-5-ones [acyl = trifluoroacetyl (HPMTFP), acetyl (HPMAP), hexanoyl (HPMHP)] were determined in various dioxane-water mixtures at 25 and 35 ± 0.1°C. The TpKa values were determined by glass-electrode potentiometry and refined by using the extensive weighted least-squares FORTRAN program TPKA. Both extrapolation and leastsquares methods were used to obtain TpKa values in pure water (0%). All three acyl derivatives are weak monoprotic acids with TpKa values between 2.5 and 3.9, following the order HPMTFP 〈 HPMAP ≤ HPMHP. The TpKa values do not vary linearly with the reciprocal of the dielectic constant of the medium; however, a plot of TpKa versus the mole fraction of dioxane, n2, is linear at a given temperature. Values of standard free energy (ΔG°), enthalpy (ΔH°) and entropy (ΔS°) changes associated with their protolytic equilibria were also calculated. Temperature, medium and substituent effects are briefly discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/poc.610041104
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  • 4
    Electronic Resource
    Electronic Resource
    Thermodynamic Proton Ionization Constants of some fluorinated β-ketoesters in dioxane-water mixtures. Influence of terminal group substitution (1990)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 332 (1990), S. 619-628 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Thermodynamic proton ionization constants, TpKa, of methyl trifluoroacetoacetate (HMTAA), ethyltrifluoroacetoacetate (HETAA) and ethylpentafluoropropionylacetate (HEPPA) have been determined in 10-50% dioxane-water mixtures at 25 and 35 ± 0.1°C applying an empirical pH correction for mixed aqueous-organic media. The TpKa values are calculated by subjecting the experimental data to rigorous weighted least-squares analysis. Further, a least-squares extrapolation technique is applied to evaluate TpKa in pure water (0% dioxane). All the three ligands are weak monoprotonic acids with their TpKa between 6.0 and 9.0. Plots of TpKa with the reciprocal of the dielectric constants of the medium are not linear but plots of TpKavs. mole fraction of dioxane are linear at a given temperature. Values of standard free energy (ΔG°), enthalpy (ΔH°) and entropy (ΔS°) changes, associated with their ionization are also computed. Temperature, medium and substituent effects are briefly discussed.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19903320506
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