Results 151 to 160 of about 827 (173)

The heat of fusion of polybutene‐1

Journal of Polymer Science Part B: Polymer Physics, 1986
AbstractThrough x‐ray diffraction, the changes in the unit‐cell parameters of crystal forms I and II of polybutene‐1 were followed from room temperature to the melting point. These data were combined with the results of other measurements to computer the heats and entropies of fusion by use of the Clapeyron equation.
Howard W. Starkweather Jr., Glover A. Jones   +1 more
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Crystallization studies on deformed polybutene‐1 melts

Polymer Engineering & Science, 1971
AbstractAn apparatus was designed and built which allowed an investigation concerning the morphology and kinetics of crystallization of a deformed polybutene‐1 melt. The polymer was quenched from a temperature above its melting point to one of two crystallization temperatures.
A. Wereta, C. G. Gogos
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Laser‐excited Raman scattering in polybutene‐1

Journal of Polymer Science Part A-2: Polymer Physics, 1969
AbstractRaman spectra are described for the three crystalline modifications of polybutene‐1. The Raman frequencies are compared with infrared results and give good agreement. A normal‐coordinate analysis for A‐mode vibrations is presented for five possible helical conformations. The behavior of several calculated helix‐sensitive bands is characterized.
S. W. Cornell, J. L. Koenig
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Isotactic polybutene‐1: Internal pressure measurements

Die Makromolekulare Chemie, 1969
AbstractSome internal pressure (Pi) measurements on modification 1 and 2 of isotactic polybutene‐1 are reported.They confirm the solid‐solid transition at 65°C for form 2 and show Pi of 1, at room temperature, to be higher than that of both form 2 and the melt; the molten polymer has an internal pressure intermediate between form 1 and form 2.
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Solution history effect in isotactic polybutene-1

Journal of Macromolecular Science, Part B, 1983
Abstract The crystallization of isotactic polybutene-1 (PB-1) from dilute solutions was studied by Holland and Miller, who observed that the resulting crystal structure was dependent on the temperature of dissolution as well as the temperature of crystallization.
K. W. Chau, P. H. Geil
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Dilute solution properties of isotactic polybutene-1

European Polymer Journal, 1969
Abstract Viscosity measurements have been made on fractions of a highly isotactic polybutene-1 sample in cyclohexane and its mixtures with the poor solvent n -propanol at various temperatures. Light scattering measurements were made in cyclohexane at 35°.
K. Satyanarayana Sastry, R.D. Patel
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Infrared characterization of polymorphism in polybutene‐1

Journal of Polymer Science Part A-2: Polymer Physics, 1966
AbstractThe transformations of the polymorphic forms of polybutene‐1 (I,II,III) were studied by infrared spectroscopy. Attenuated total reflectance spectra demonstrate that the II → I transformation occurs initially and most rapidly on the film surfaces. Electron irradiation experiments showed the II → I conversion can be suppressed by irradiation. The
J. P. Luongo, R. Salovey
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Laser Raman spectrum of isotactic polybutene-1 fibres

Polymer, 1981
Abstract Detailed polarized laser Raman spectra of isotactic hexagonal polybutene-1 fibres are presented. The use of different scattering geometries enables us to determine unambiguously the symmetry of Raman bonds from 300 to 3000 cm −1 . The comparison between calculated and observed intensities enables us to test the individuality of CH 2 and CH ...
Michel Abenoza, Alain Armengaud
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Thermodynamic properties of polybutene‐1 and butene‐1

Journal of Polymer Science Part A-2: Polymer Physics, 1967
Abstract : Using published specific heat data, the entropy, enthalpy, and Gibbs free energy of polybutene-1 (PB) were calculated over the temperature range 0 to 315K. The encraty, C sub p/T vs. T, calculated for PB exhibits a maximum at 60K and a small inflection at about 250K, which is associated with the glass transition.
R. W. Warfield, M. C. Petree
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The enhancement of polybutene-1 crystallinity in polybutene-1/polypropylene blends

Journal of Polymer Science Part C: Polymer Letters, 1987
Mao-Song Lee, Show-An Chen
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