Results 131 to 140 of about 27,543,308 (166)

Zur Toxikologie von Polybuten-(1)

F�hner-Weilands Sammlung von Vergiftungsf�llen Archiv f�r Toxikologie, 1968
Unter den Bedingungen eines halbjahrigen Futterversuchs (1% und 10% Gehalt) an Ratten fand sich kein Anhalt fur eine gesundheitliche Bedenklichkeit des Kunststoffs Polybuten-(1).
Gerhard Bornmann, Arnold Loeser
openaire   +1 more source

Influence of the Environment on the Phase II - I Transformation of Isotactic Polybutene - 1

Journal of Macromolecular Science - Physics, 2019
The phase II to I transformation process of isotactic polybutene–1 (iPB-1) is influenced by the environment besides the usual physical factors. The phase II → I transformation rate depends, first of all, on the segmental mobility of the polymer chains ...
Kaszonyiová, Martina, Rybnikář, František   +1 more
exaly   +2 more sources

Preparation of high isotactic polybutene-1

Journal of Applied Polymer Science, 2000
Polymerization of butene-1 (B-1) was carried out with a PP-TiCl3/Et2AlCl/methyl methacrylate (MMA) catalyst system in n-heptane. The influence of temperature, pressure, time and H2 on molecular weight, isotacticity, and catalytic activity were studied by viscometry, solubility in boiling diethyl ether, and measuring the polymer produced, respectively ...
S. Abedi, N. Sharifi-Sanjani
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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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Multiple phase transitions of polybutene‐1

Journal of Polymer Science Part C: Polymer Symposia, 1966
AbstractMultiple phase transitions of polybutene‐1 in the form III modification have recently been the subject of discussion by a number of authors. The exact nature of the observed phenomena has remained in doubt, leading to the proposal of divergent theories.
C. Geacintov, R. B. Miles, H. J. L. Schuubmans   +2 more
openaire   +1 more source

Annealing of polybutene‐1 single crystals

Journal of Polymer Science Part A-2: Polymer Physics, 1968
AbstractThe effects of thermal treatment in the 70–90°C. region on polybutene‐1 crystals, prepared by precipitation from dilute pentyl acetate solutions and with lath, hexagonal, and square morphologies, have been studied by using electron microscopy.
A. E. Woodward, D. R. Morrow
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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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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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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
openaire   +1 more source