Results 201 to 210 of about 1,188 (220)

Deformation and stress-induced transformation of polybutene-1

Journal of Macromolecular Science, Part B, 1989
Abstract The deformation at room temperature of thick (ca. 2 mm) and thin (ca. 1000 A) films of polybutene was characterized by electron microscopy and electron x-ray diffraction. The thin films, as studied, draw by micronecking whereas the thick films draw uniformly.
T. C. Hsu, Phillip H. Geil
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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.
M. C. Petree, R. W. Warfield
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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.
J. L. Koenig, S. W. Cornell
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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.
Anthony Wereta, Costas G. Gogos
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Nucleation of crystallization in molten isotactic polybutene‐1

Journal of Polymer Science Part A-2: Polymer Physics, 1968
AbstractDroplet experiments have been performed on polybutene‐1. It was found that this polymer can be cooled to room temperature without homogeneous nucleation of crystallization. It was also found that when the polymer was heterogeneously nucleated, form I (as well as form II) could be crystallized directly from the melt.
D. Turnbull, Joanne R. Burns
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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, Ravji D. Patel
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The enhancement of polybutene-1 crystallinity in polybutene-1/polypropylene blends

Journal of Polymer Science Part C: Polymer Letters, 1987
Show-An Chen, Mao-Song Lee
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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
J. A. Sauer, A. E. Woodward, R. A. Wall
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Epitaxy and Crystal Polymorphism of Isotactic Polybutene-1

1993
The three crystalline phases of polybutene-1, which differ by their helix conformation and unit cell parameters are obtained by bulk crystallization via epitaxy on appropriate substrates. The epitaxial relationships are analyzed, based on selected area electron diffraction patterns.
S. Kopp, Bernard Lotz, Jean-Claude Wittmann   +2 more
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