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  • Inorganic Chemistry  (2)
  • Polymer and Materials Science  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    The influence of chain structure on the equilibrium melting temperature of poly(vinylidene fluoride) (1991)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 29 (1991), S. 1287-1297 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Three poly(vinylidene fluoride) whole polymers were fractionated according to their head-to-head concentrations. Their melting temperatures and fusion properties were studied. Although small but significant differences were found among the fractions obtained from a given parent polymer, a wide range in chain compositions was not obtained. The equilibrium melting temperatures were determined by extrapolating the dependence of the observed melting temperature on the crystallization temperature. A critical analysis is given of this extrapolation method as applied to poly(vinylidene fluoride) and the results are compared with literature reports. The problems involved in explaining the dependence of the equilibrium melting temperatures on the structural irregularities of the chain are given. Possible reasons for the relatively high level of crystallinity that is observed, for what is essentially a copolymer, are also discussed.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1991.090291012
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  • 2
    Electronic Resource
    Electronic Resource
    Complex Carbonates of Chromium(III) (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 404 (1974), S. 81-86 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Komplex-Carbonate des Chrom(III)Durch Mischen von Cr(III)-Lösungen mit Lösungen von (NH4)2Co3 oder KHCO3 werden tieffarbige Lösungen und mit NaHCO3 ein Niederschlag erhalten. Das Spektrum von Cr(NO3)3 (violett) gelöst in 35proz. KHCO3-Lösung zeigt Absorptionsmaxima bei 430 und 580 nm, wogegen Cr(NO3)3 (violett) Absorptionsmaxima bei 410 und 575 nm hat. Die Lösung von Cr(III) in 20proz. KHCO3-Lösung wurde durch Ionenaustausch untersucht. Die Komplex-Carbonate des Chroms (Formeln siehe Abstract) wurden dargestellt und thermogravimetrisch untersucht sowie die IR-Spektren aufgenommen und Bandenzuordnungen vorgenommen.
    Notes: On adding chromium(III) solution to solutions of (NH4)2CO3 or KHCO3, deep coloured solutions are obtained, whereas, in the case of NaHCO3 a precipitate is obtained. The spectrum of chromium(III) nitrate (violet) dissolved in KHCO3 (35%) solution shows maximum absorbances at 430 and 580nm, whereas the spectrum for chromium(III) nitrate (violet) shows maximum absorbances at 410 and 575 nm. The chromium(III) solution dissolved KHCO3 (20%) is studied by ion exchange method. The complex carbonates of chromium (III), viz., (i) (NH4)2[Cr2(OH)4(CO3)2] · H2O, - (ii) K7[Cr4(OH)9(CO3)5] · 6 H2O, - (iii) Na3[Cr2(OH)5(CO3)2] · 4 H2O, - (iv) NH4[Co(NH3)6] [Cr3(OH)7(CO3)3] · 4 H2O, and (v) K6[Co(NH3)6]2[Cr2(OH)4(CO3)3]3 are isolated and studied by thermogravimetry. The infrared spectra of these compounds are recorded and probable band assignments made.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744040107
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  • 3
    Electronic Resource
    Electronic Resource
    Complex Carbonates of Iron(III) (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 327-336 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Komplex-Carbonate des Eisen (III).Komplex-Carbonate des Eisen(III) (Formeln siehe Abstract) wurden dargestellt und thermogravimetrisch untersucht. Das Eisen liegt hier im Anion des Komplexes vor, und die Lösungen dieser Komplexe haben ein Absorptionsmaximum bei 460 nm. Die IR-Spektren wurden aufgenommen und Bandenzuordnungen vorgenommen. Die Reaktion zwischen KHCO3 und Fe(NO3)3 wurde mit chemischen und physikalischen Methoden untersucht.
    Notes: The complex carbonates of iron(III) are shown to be anionic in nature. The solutions containing these complexes show a maximum absorbance at 460 nm. The complex carbonates of iron(III), viz., (i) K6[Fe2(OH)2(CO3)5] · H2O,  -  (ii) Na2[Fe3O2(OH)3(CO3)2],  -  (iii) K[Co(NH3)6]2[Fe3(OH)4(CO3)6],  -  (iv) K5[Co(NH3)6]3[Fe3(OH) 4(CO3)6]2,  -  (v) K[Co(NH3)6][Fe2(OH)4(CO3)3], and (vi) NH4[Co(NH3)6][Fe2(OH)4(CO3)3] are isolated and studied by thermogravimetry. The infrared spectra of these compounds are recorded and probable band assignments made. Besides, the reaction between KHCO3 and Fe(NO3)3 was studied through chemical and physicochemical methods.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744030312
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