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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 255 (1977), S. 932-932 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Polymer bulletin 2 (1980), S. 619-624 
    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: Summary It has been demonstrated that multiblock (AB)n co-polymers of silane terminated poly(dimethylsiloxane) and hydroxyl terminated polyethylene can be prepared by coupling in the presence of stannous octanoate. Values of n from 3 to 10 have been obtained. Compositions were varied by using different block lengths and potentially useful elastoplastics can be prepared when the weight % of both components is comparable. The complex modulus for one such structure varied from 1.5×108Nm−2 to 4×107Nm−2 in the temperature range 150K to 390K.
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 156 (1972), S. 183-193 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Das Gleichgewicht zwischen dem gasförmigen Monomeren und dem amorphen Polymeren wurde für Tetrahydrofuran und für 1.3-Dioxolan im Temperaturbereich zwischen 40 und 80°C studiert. Mit kationischen Initiatoren stellt sich das Gleichgewicht beim THF sehr langsam, beim Dioxolan degegen erheblich schneller ein. Aus den Gleichgewichtsdrücken des Monomeren wurden die Werte von ΔH0gc und ΔS0gc berechnet. Mit Hilfe der aus Dampfdruckmessungen erhaltenen thermodynamischen Daten für die Verdampfung der Monomeren wurden außerdem Werte für ΔH01c und ΔS01c berechnet.Für THF gilt: ΔH0gc (298°K) = -39,7 ± 2,3 kJ · mole-1; ΔH01c (298°K) = -7,4 ± 2,3 kJ · mole-1;ΔS0gc (298°K) = -111,6 ± 6,9 J ·°K-1 mole-1; ΔS01c (298°K) = -16,2 ± 7,0 J ·°K-1 mole-1;und für 1.3-Dioxolan: ΔH0gc (298°K) = -50,1 ± 0,8 kJ · mole-1; ΔH01c (298°K) = -14,6 ± 1,0 kJ · mole-1;ΔS0gc (298°K) = -139,2 ± 2,2 J ·°K-1 mole-1; ΔS01c (298°K) = -36,7 ± 3,0 J ·°K-1 mole-1;
    Notes: The equilibrium between gaseous monomer and amorphous polymer has been studied for tetrahydrofuran and 1.3-dioxolan between 40 and 80°C. The approach to equilibrium catalysed by cationic initiators was extremely slow for tetrahydrofuran but rapid for 1.3-dioxolan. From the equilibrium pressures of monomer the ΔH0gc and ΔS0gc values have been calculated. By means of thermodynamic data for the vaporisation of the two monomers, obtained from vapour pressure measurements, we have also calculated ΔH01c and ΔS01c.For tetrahydrofuran: ΔH0gc (298°K) = -39.7 ± 2.3 kJ · mole-1; ΔH01c (298°K) = -7.4 ± 2.3 kJ · mole-1;ΔS0gc (298°K) = -111.6 ± 6.9 J ·°K-1 mole-1; ΔS01c (298°K) = -16.2 ± 7.0 J ·°K-1 mole-1;and for 1.3-dioxolan: ΔH0gc (298°K) = -50.1 ± 0.8 kJ · mole-1; ΔH01c (298°K) = -14.6 ± 1.0 kJ · mole-1;ΔS0gc (298°K) = -139.2 ± 2.2 J ·°K-1 mole-1; ΔS01c (298°K) = -36.7 ± 3.0 J ·°K-1 mole-1;
    Additional Material: 1 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 169 (1973), S. 199-209 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Das Gleichgewicht zwischen dem gasförmigen Monomer und dem amorphen Polymer wurde am Oxepan und am 1,3-Dioxepan im Temperaturbereich von 38°C bis 92°C studiert. Die ΔH°gc- und ΔS°gc- Werte wurden aus den Gleichgewichtsdrucken berechnet. Weiterhin wurden die thermodynamischen Daten für die Verdampfung von beiden Monomeren gemessen, mit deren Hilfe dann die ΔH1c°- und ΔS1c°- Werte für die Polymerisationen berechnet werden konnten:Für Oxepan: \documentclass{article}\pagestyle{empty}\begin{document}$$\begin{array}{*{20}c} {\Delta H_{{\rm gc}}^\circ (298{\rm K}) = - 38,6 \pm 0,6{\rm kJ} \cdot {\rm mol}^{ - 1} ;\Delta H_{{\rm 1c}}^\circ (298{\rm K}) = + 1,7 \pm 0,8{\rm kJ} \cdot {\rm mol}^{ - 1} } \\ {\Delta S_{{\rm gc}}^\circ (298{\rm K}) = - 91,8 \pm 1,6{\rm J} \cdot {\rm K}^{{\rm - 1}} \cdot {\rm mol}^{ - 1} ;\Delta S_{{\rm 1c}}^\circ (298{\rm K}) = + 12,4 \pm 2,5{\rm J} \cdot {\rm K}^{{\rm - 1}} \cdot {\rm mol}^{ - 1} } \\ \end{array} $$\end{document}Für 1,3-Dioxepan: \documentclass{article}\pagestyle{empty}\begin{document}$$\begin{array}{*{20}c} {\Delta H_{{\rm gc}}^\circ (298{\rm K}) = - 53,9 \pm 0,6{\rm kJ} \cdot {\rm mol}^{ - 1} ;\Delta H_{{\rm 1c}}^\circ (298{\rm K}) = - 13,0 \pm 0,8{\rm kJ} \cdot {\rm mol}^{ - 1} } \\ {\Delta S_{{\rm gc}}^\circ (298{\rm K}) = - 131,4 \pm 1,7{\rm J} \cdot {\rm K}^{{\rm - 1}} \cdot {\rm mol}^{ - 1} ;\Delta S_{{\rm 1c}}^\circ (298{\rm K}) = - 25,1 \pm 2,5{\rm J} \cdot {\rm K}^{{\rm - 1}} \cdot {\rm mol}^{ - 1} } \\ \end{array} $$\end{document}
    Notes: The equilibrium between gaseous monomer and amorphous polymer has been studied for oxepane and 1,3-dioxepane between 38°C and 92°C. From the equilibrium pressures of monomer the ΔH°gc and ΔS°gc values have been calculated. Thermodynamic data for the vaporisation of each monomer have also been measured and have enabled values of ΔH1c° and ΔS1c° for the polymerisations to be calculated.For oxepane: \documentclass{article}\pagestyle{empty}\begin{document}$$\begin{array}{*{20}c} {\Delta H_{{\rm gc}}^\circ (298{\rm K}) = - 38,6 \pm 0,6{\rm kJ} \cdot {\rm mol}^{ - 1} ;\Delta H_{{\rm 1c}}^\circ (298{\rm K}) = + 1,7 \pm 0,8{\rm kJ} \cdot {\rm mol}^{ - 1} } \\ {\Delta S_{{\rm gc}}^\circ (298{\rm K}) = - 91,8 \pm 1,6{\rm J} \cdot {\rm K}^{{\rm - 1}} \cdot {\rm mol}^{ - 1} ;\Delta S_{{\rm 1c}}^\circ (298{\rm K}) = + 12,4 \pm 2,5{\rm J} \cdot {\rm K}^{{\rm - 1}} \cdot {\rm mol}^{ - 1} } \\ \end{array} $$\end{document} and for 1,3-dioxepane: \documentclass{article}\pagestyle{empty}\begin{document}$$\begin{array}{*{20}c} {\Delta H_{{\rm gc}}^\circ\ (298{\rm K}) = - 53,9 \pm 0,6{\rm kJ} \cdot {\rm mol}^{ - 1} ;\Delta H_{{\rm 1c}}^\circ\ (298{\rm K}) = - 13,0 \pm 0,8{\rm kJ} \cdot {\rm mol}^{ - 1} } \\ {\Delta S_{{\rm gc}}^\circ\ (298{\rm K}) = - 131,4 \pm 1,7{\rm J} \cdot {\rm K}^{{\rm - 1}} \cdot {\rm mol}^{ - 1} ;\Delta S_{{\rm 1c}}^\circ\ (298{\rm K}) = - 25,1 \pm 2,5{\rm J} \cdot {\rm K}^{{\rm - 1}} \cdot {\rm mol}^{ - 1} } \\ \end{array} $$\end{document}
    Additional Material: 2 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 74 (1962), S. 80-80 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 23 (1988), S. 739-742 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 138 (1970), S. 65-76 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Das Gleichgewicht zwischen gasförmigem Formaldehyd und hochkristallinem Polyformaldehyd wurde in Gegenwart von gasförmigen kationischen Initiatoren untersucht. Erstmalig wurde in diesen Experimenten die Zusammensetzung der Gasphase genau untersucht. Die quantitative Bestimmung der beiden hauptsächlichen Verunreinigungen, des Methylformiats und des Trioxans, in Gleichgewichtsexperimenten zwischen 325 und 368°K, haben die richtigen Werte der Gleichgewichtspartialdrucke des Formaldehyds ergeben. Folgende thermodynamische Werte für die Polymerisation des Formaldehyds wurden erhalten: \documentclass{article}\pagestyle{empty}\begin{document}$$\begin{array}{*{20}l} {\Delta {\rm H}_{{\rm gc}'}^0 (298^\circ {\rm K}) = - 66,4 \pm 1,0\ {\rm kJ Mole}^{ - 1} } \\ {\Delta {\rm S}_{{\rm gc}'}^0 (298^\circ {\rm K}) = - 169.5 \pm 2.9\ {\rm J}^\circ {\rm K}^{ - 1} {\rm Mole}^{ - 1} } \\ \end{array} $$\end{document} und für die Polymerisation des festen Trioxans zu kristallinem Paraformaldehyd: \documentclass{article}\pagestyle{empty}\begin{document}$$\begin{array}{*{20}c} {\Delta {\rm H}_{{\rm sc}'}^0 (298^\circ {\rm K}) = - 4.6 \pm 3,9{\rm kJ}\left( {{\rm Mole Trioxan}} \right)^{ - 1} } \\ {\Delta {\rm S}_{{\rm sc}'}^0 (298^\circ {\rm K}) = + 18 \pm 16{\rm J}^\circ {\rm K}^{ - 1} \left( {{\rm Mole Trioxan}} \right)^{ - 1} } \\ \end{array}$$\end{document}Die freie Energie der Polymerisation des festen Trioxans ist also negativ bei allen Temperaturen, wie das auch für das Tetroxan der Fall ist.
    Notes: The equilibrium between gaseous formaldehyde and highly crystalline polyformaldehyde in the presence of gaseous cationic initiators has been investigated. For the first time in such experiments the constitution of the gas phase has been closely investigated. Quantitative estimation of the two major impurities, methyl formate and trioxan, in equilibrium experiments in the temperature range 325 to 368°K has given true values of the equilibrium partial pressure of formaldehyde. The results have yielded the following thermodynamic values for the polymerisation of formaldehyde: \documentclass{article}\pagestyle{empty}\begin{document}$$\begin{array}{*{20}l} {\Delta {\rm H}_{{\rm gc}'}^0 (298^\circ {\rm K}) = - 66.4 \pm 1.0\ {\rm kJ mole}^{ - 1} } \\ {\Delta {\rm S}_{{\rm gc}'}^0 (298^\circ {\rm K}) = - 169.5 \pm 2.9\ {\rm J}^\circ {\rm K}^{ - 1} {\rm mole}^{ - 1} } \\ \end{array} $$\end{document} and for the polymerisation of solid trioxan to crystalline polyformaldehyde: \documentclass{article}\pagestyle{empty}\begin{document}$$\begin{array}{*{20}c} {\Delta {\rm H}_{{\rm sc}'}^0 (298^\circ {\rm K}) = - 4.6 \pm 3.9{\rm kJ}\left( {{\rm mole\ trioxan}} \right)^{ - 1} } \\ {\Delta {\rm S}_{{\rm sc}'}^0 (298^\circ {\rm K}) = + 18 \pm 16{\rm J}^\circ {\rm K}^{ - 1} \left( {{\rm mole\ trioxan}} \right)^{ - 1} } \\ \end{array} $$\end{document}The free energy of polymerisation of solid trioxan is thus negative at all temperatures as is that of tetroxan.
    Additional Material: 2 Ill.
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  • 8
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The polymerization of fluoral initiated by the photolyzed decomposition of azobisisobutyronitrile at low temperature has been studied. Up to 2% conversion, the effect of radical scavengers and the order with respect to initiator and light intensity indicate that the reaction occurs by a conventional radical polymerization mechanism. At about 2% conversion autoacceleration sets in and the rates become irreproducible. This is explained by typical occlusion phenomena. Tracer studies show that polymer prepared at high conversion contains initiator fragments indicating that primary propagation is by monomer addition to radicals. The reaction mechanism is discussed.
    Additional Material: 3 Ill.
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