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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of poly(tetramethyldisilylene-co-styrene) (1992)
    s.l. : American Chemical Society
    Macromolecules 25 (1992), S. 5165-5170 
    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/ma00046a008
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  • 2
    Electronic Resource
    Electronic Resource
    Water Balance and Evaporation Studies (1965)
    [s.l.] : Nature Publishing Group
    Nature 208 (1965), S. 776-776 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Ea = aerodynamic term 0-0105(0-5 + 0-01 U) (ea-ed) U = miles per day at 2 m height, ea is the saturation vapour pressure of air at temperature Ta. y is the psy-chrometric constant; A is the gradient of saturation vapour pressure against temperature curve at air temperature. The first and last ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/208776a0
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  • 3
    Electronic Resource
    Electronic Resource
    Surface Tension and Lindemann Frequency (1939)
    [s.l.] : Nature Publishing Group
    Nature 143 (1939), S. 723-723 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ANDRADE1 has derived the expression ... for the viscosity (η) of a liquid at its melting point in terms of the molecular mass (m), the Lindemann frequency (ν) and the mean molecular distance (σ). This simple relation has been amply substantiated by experimental results and has ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/143723a0
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  • 4
    Electronic Resource
    Electronic Resource
    Electric-field effect on positronium formation and decay in some polymers and fused quartz (1980)
    Springer
    Applied physics 22 (1980), S. 317-321 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 71.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The effect of static electric field on the formation and annihilation of positronium in polyethylene, polystyrene, teflon, quartz, nylon and perspex has been investigated employing a fast timing spectrometer with prompt resolution (fwhm) ∼200 ps at the positron experimental settings. No significant variation in the lifetime of the long lived pick-off component with electric field has been observed. The intensity of the long-lived pick-off component decreases with increase of the field in all the cases investigated except in nylon and perspex where the intensity remains constant with the field. The results have been discussed in the frame work of the spur reaction model proposed by Mogensen and also in the light of the Ore gap model, as discussed by Brandt and Wilkenfeld. Another interesting correlation seems to exist between positronium formation and dielectric loss factor; in case of increasing loss factor there is a decrease in the effect of electric field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899885
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  • 5
    Electronic Resource
    Electronic Resource
    Temperature Dependence of Adiabatic Compressibility (1941)
    [s.l.] : Nature Publishing Group
    Nature 147 (1941), S. 268-269 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IT is well known that the adiabatic compressibility βφ of a liquid increases fairly rapidly with rise in temperature. The rise becomes more rapid as the temperature increases. With many liquids the adiabatic compressibility increases by about 60 per cent for a rise of temperature ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/147268b0
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  • 6
    Electronic Resource
    Electronic Resource
    Thermochemical characterization of phenolic resins (1997)
    Springer
    Journal of thermal analysis and calorimetry 49 (1997), S. 261-268 
    Details
    ISSN: 1572-8943
    Keywords: kinetics ; phenol-formaldehyde resins ; pyrolysis-GC ; thermal degradation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Phenol-formaldehyde resins (I andII), synthesised at a monomer feed ratio of F/P = 1.0 and 1.5, were cured at 130
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01987447
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  • 7
    Electronic Resource
    Electronic Resource
    Thermal degradation of liquid polysulfide polymers: Pyrolysis-GC-MS and thermogravimetric studies (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 30 (1985), S. 855-873 
    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 thermal decomposition of Thioped, a liquid polysulfide polymer based on dichloroethyl formal, was studied using pyrolysis-GC-MS. The nature and composition of the products of pyrolysis at 358 and 485°C are given. A striking feature of the product analysis is the presence of several disulfide compounds only at the higher decomposition temperature. The pyrolysis-GC of other liquid polysulfide polymers (LP-2, LP-32, LP-3, and LP-33) showed that molecular weight had only marginal effect on the product composition. Ionic and radical mechanisms were considered to account for the product formation. Isothermal and dynamic thermogravimetric studies were carried out to differentiate between the two mechanisms. The results were found to be in agreement with a free radical mechanism, with cleavage of the formal C—O linkage as the preferred mode of initiation. The overall activation energy for the decomposition was found to be 190 kJ mol-1.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1985.070300233
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  • 8
    Electronic Resource
    Electronic Resource
    Characterization of cured polysulfide polymers by thermal degradation: Pyrolysis-GC and thermogravimetric studies (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 34 (1987), S. 1985-1996 
    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: Polymers prepared by curing thiol-terminated liquid polysulfide polymer [HS(RS2)nRSH, R = —CH2CH2OCH2OCH2CH2—] with p-quinonedioxime, PbO2, and MnO2 were studied by pyrolysis-GC and thermogravimetry. Characteristic differences were observed in the composition of the pyrolyzates under flash pyrolysis at 420 and 470°C. The concentration of the cyclic monomer, 1,3-dioxa-6,7-dithionane, in the pyrolyzates was found to vary considerably from polymer to polymer. The change in mechanism with the extent of degradation and the corresponding overall activation energies were evaluated by thermogravimetry. The pyrolysis-GC and thermogravimetric data were shown to provide partial characterization of the substrates. Mn appears to be in a coordinated complex in the MnO2-cured polymer.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1987.070340517
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  • 9
    Electronic Resource
    Electronic Resource
    Spectroscopic studies on the oligomers of bromotrifluoro ethylenePresented at First National Conference on Fluorine Chemicals and Polymers, Trivandrum, India, July 21-22, 1983. (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 24 (1986), S. 1007-1017 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The photo-initiated oligomerization of bromotrifluoroethylene in chlorotrifluoromethane medium was found to yield a complex mixture of products. 19F-nmr, infrared and GC-MS spectra revealed the presence of -CF2Br and  - CF = CF2 and the absence of  - CF Br2 and  - CF3 end groups in the products. Oligomers up to pentamers were identified and their structures elucidated by GC-MS. A plausible mechanism for their formation is suggested.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1986.080240516
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  • 10
    Electronic Resource
    Electronic Resource
    Thermal degradation of functionally terminated polybutadienes: Pyrolysis gas chromatography and thermogravimetric studies (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 41 (1990), S. 2251-2263 
    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: Thermal degradation of functionally terminated liquid polybutadiene polymers, carboxy-terminated polybutadiene (CTPB), hydroxy-terminated polybutadiene (HTPB), and poly(butadieneacrylonitrile-acrylic acid) terpolymer (PBAN) and their cured analogues were studied by pyrolysis gas chromatography in the temperature range 500-850°C. It was found that CTPB, HTPB, and PBAN could be distinguished from one another by the variation in the composition of their pyrolyzates. The differences in the product composition were rationalized by the relative importance of unzipping and hydrogen transfer reactions in the mechanisms of their degradation. The presence of the OH group was found to favor hydrogen transfer reactions whereas the COOH group has only marginal effect. The cyclization reactions were found to predominate in the thermal degradation of cured PBAN and the pyrolysis results were substantiated by thermogravimetric studies at several heating rates. The activation energy for the decomposition of cured PBAN was estimated to be 259 ± 16 kJ mol-1 by Ozawa's method.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070410928
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