Results 111 to 120 of about 266 (146)

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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Time dependent crystallinity of polybutene‐1

Polymer Engineering & Science, 1966
AbstractIsotactic Polybutene‐1 can exist in 4 different crystalline phases of varying stability of which two are of greatest importance because they are involved in solidification from the melt initially, the melt cools into an unstable crystalline phase which gradually and spontaneously transforms into a stable, stronger, stiffer, more crystalline ...
S. Y. Choi, J. P. Rakus, J. L. O'Toole
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Isotactic Polybutene-1 Single Crystals: Morphology

Journal of Applied Physics, 1964
Three crystalline modifications of isotactic polybutene-1 have been obtained from dilute solution in a variety of habits. These three crystalline modifications are: (a) tetragonal, (b) ``untwinned'' hexagonal, and (c) orthorhombic. The structure of the orthorhombic polymorph has not previously been reported.
V. F. Holland, Robert L. Miller
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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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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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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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Local deformation in stretched polybutene‐1 spherulites

Journal of Polymer Science Part A-2: Polymer Physics, 1970
AbstractThe orientation of crystals in spherulites of modifications I and II of polybutene‐1 was studied by micro‐x‐ray diffraction. Changes in such micro‐x‐ray diffraction patterns were measured in various regions of the spherulites as a function of strain and time. The relationship between micro‐x‐ray diffraction from parts of spherulites and macro‐x‐
R. Y. Yee, R. S. Stein
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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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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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Segmental Motion in Polybutene-1

The Journal of Chemical Physics, 1959
A. E. Woodward, J. A. Sauer, R. A. Wall
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