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  • 1
    Electronic Resource
    Electronic Resource
    Influence of molecular weight on the crystallization of poly(vinylidene fluoride) (1989)
    Springer
    Polymer bulletin 22 (1989), S. 645-651 
    Details
    ISSN: 1436-2449
    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 Five samples of Poly (vinylidene fluoride) with a molecular weight from 45,000 to 260,000 were analyzed by means of FT-IR spectroscopy in order to study the influence of molecular weight $$\left( {\bar Mv} \right)$$ on the crystallization process. The spectra of films obtained from methylethylketone solutions revealed the prevalence of form II (α) in the case of lower $$\bar Mv$$ and of form III (γ) in the higher molecular weight samples. The amount of form III was found to increase as the Mv decreased and as annealing temperatures increased. The deconvolution technique of vibrational spectra allowed detection of small amounts of other forms accompanying the prevailing one.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00718947
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The water-formaldehyde-hydrogen sulfide system. I. Solubility of hydrogen sulfide in aqueous solutions of formaldehyde and first solid product of the system (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 2895-2910 
    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: We have ascertained that aqueous solutions of formaldehyde absorb hydrogen sulfide proportionally to the formaldehyde present in solution. The highest molar ratio obtainable in solution is equivalent to the value CH2O/H2S = 2. When this ratio is reached, regardless of the initial concentration of formaldehyde, if the solutions are maintained constantly under pressure of hydrogen sulfide, separation of a solid product begins. Various chemical and physical studies indicate that the first solid separated from this system is HSCH2SCH2SCH2OCH2OH. A possible mechanism of formation of this compound from the liquid phase is discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1965.070090823
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  • 3
    Electronic Resource
    Electronic Resource
    Compositive characterization of urea-formaldehyde adhesives by NMR spectroscopy (1975)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 46 (1975), S. 151-162 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wird eine auf NMR-Spektroskopie und chemischer Analyse beruhende Charakterisierungsmethode für Harnstoff-Formaldehyd-Harze (UF) beschrieben. Um die Interpretation der NMR-Spektren der UF-Harze zu ermöglichen, wurden folgende Standardprodukte synthetisiert: Monomethylolharnstoff, Dimethylolharnstoff, Monomethylolharnstoff-monomethyläther, Dimethylolharnstoff-dimethyläther, Methylendiharnstoff, Dimethyloloxymethylendiharnstoff.Die Aufnahme der NMR-Spektren erfolgte ohne vorhergehende chemische Behandlung in Dimethylsulfoxid-d6/CaCl2 Lösung.Die vorgeschlagene Methode ermöglicht die Bestimmung von freiem Formaldehyd, von Methylol-, Methylen- und Oxymethylengruppen und von unsubstituierten, mono- und disubstituierten Amidgruppen.
    Notes: A method of compositive characterization of Urea-Formaldehyde (UF) adhesives has been developed by combining NMR spectroscopy and chemical analysis. Urea-formaldehyde standard derivatives were prepared to interpret the NMR spectra of UF condensates.The synthesized standard derivatives are: monomethylol urea, dimethylol urea, monomethylolurea-methylether, dimethylolurea-dimethylether, methylene-diurea, dimethylol-oxymethylene-diurea.The UF condensates were examined in dimethylsulfoxide d6/CaCl2 solution without any chemical pretreatments. By this method it is possible to determine the content of free methylol, methylene, and oxymethylene formaldehyde and of nonsubstituted, monosubstituted, and bisubstituted amide groups.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1975.050460114
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Compositive characterization of melamine-formaldehyde condensates by NMR spectroscopy (1976)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 56 (1976), S. 15-25 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wird eine auf NMR-Spektroskopie und chemischer Analyse beruhende Charakterisierungsmethode für Melamin-Formaldehyd-Harze (MF) beschrieben. Um die Interpretation der NMR-Spektren der MF-Harze zu ermöglichen, wurden einige Standardprodukte (Dimethylolmelamin, Trimethylolmelamin und Hexamethylolmelamin) synthetisiert. Die Aufnahme der NMR-Spektren erfolgte ohne vorhergehende chemische Behandlung in Dimethylsulfoxid-d6/CaCl2 Lösung.Die vorgeschlagene Methode ermöglicht die Bestimmung von Methylol-, Methylen- und Oxymethylengruppen und von unsubstituierten sowie mono- und disubstituierten Aminogruppen.
    Notes: A method of compositive characterization of Melamine-Formaldehyde (MF) condensates by combining NMR spectroscopy and chemical analysis has been developed. Some Melamine-Formaldehyde derivatives were prepared (dimethylol melamine, trimethylol melamine, hexamethylol melamine) to interpret the NMR spectra of MF condensates. The MF condensates (solid or lyophilized samples) were examinated in dimethylsulfoxide d6/CaCl2 solvent phase without any chemical pretreatments.By this method it is possible to determine the content of methylol, methylene and oxymethylene formaldehyde and of nonsubstituted, monosubsituted and disubstituted amino groups.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1976.050560102
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Interactions of carboxylated polymer latexes with polyethoxylated nonionic surfactants (1980)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 1 (1980), S. 709-713 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1980.030011202
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    Paper (German National Licenses)
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