Results 121 to 130 of about 27,543,308 (166)

Deformation of polybutene‐1 spherulites

Journal of Polymer Science Part A-2: Polymer Physics, 1967
AbstractThe deformation of fresh and aged polybutene‐1 spherulitic samples has been investigated by microscopic observation, interferometry, studying macroscopic and spherulitic birefringence changes, and study of light‐scattering patterns. The spherulite deformation is not affine, the microscopic deformation ratio being less than the macroscopic ...
Rena Yang, R. S. Stein
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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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Spherulite deformation in polybutene‐1

Journal of Polymer Science Part B: Polymer Letters, 1963
Abstract : The postulate of spherulite deformation has now been verified by direct microscopic observation. Films of polybutene-1, about 1 mil thickness, (made from samples obtained through the courtesy of Phillips Petroleum Company) were prepared by molding in a laboratory press at 150 C for 15 min at 2,000 psi pressure and then lowering the ...
K. Sasaguri, M. B. Rhodes, R. S. Stein
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Effect of polymorphism of isotactic polybutene‐1 on peel behavior of polyethylene/polybutene‐1 peel systems

Journal of Applied Polymer Science, 2007
AbstractThe effect of polymorphism of isotactic polybutene‐1 (iPB‐1) on the peel behavior of the specific peel system low‐density polyethylene/polybutene‐1 (LDPE/iPB‐1) was investigated using wide‐angle X‐ray scattering, calorimetry, and the T‐peel test.
Michael Nase, René Androsch, Beate Langer, Hans Joachim Baumann, Wolfgang Grellmann   +4 more
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High pressure dilatometry on polybutene-1

Colloid and Polymer Science, 1983
High pressure dilatometry is used to study the melting processes and the melt of isotactic polybutene-1. Evaluating a great number of isobaricV(T)-curves determined in the range of a few hundred bar the pressure dependence of the melting temperature is accurately determined for modifications I and II.
U. Leute, W. Dollhopf
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Deformation of polybutene-1 crystal aggregates

Journal of Macromolecular Science, Part B, 1970
Abstract The plastic deformation of polybutene-1 crystals on a uniaxially drawn substrate has been studied using an electron microscope. Crystals with hexagonal morphology and crystal structure, with orthorhombic structure and with square morphology were investigated.
D. R. Morrow, A. E. Woodward
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Differential thermal analysis of polybutene‐1

Journal of Polymer Science Part C: Polymer Symposia, 1964
AbstractThe three polymorphic forms of polybutone‐1 may be easily characterized by DTA: Form I has a DTA peak near 132°C; Form II has a peak near 118°C; and Form III has doublet peaks at 104° and 118°C. The kinetics of the room temperature transformation of Form II to Form I have been qualitatively investigated by DTA.
Bert H. Clampitt, Richard H. Hughes
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Solution history effects in polybutene-1

Journal of Macromolecular Science, Part B, 1984
Abstract The crystal structure and helical conformation of polybutene-1 crystallized from dilute solution is shown to be a function of the crystal structure before dissolution, the maximum temperature in solution attained before cooling to the crystallization temperature, and the time at that maximum temperature.
K. W. Chau, P. H. Geil
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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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Growth morphology of isotactic polybutene-1

European Polymer Journal, 1973
Abstract Isotactic polybutene-1 has been crystallized from solution by the film formation method. Well-defined single crystals have been grown from solutions of the polymer in amyl acetate and its mixtures with n-butanol in all the three modifications by varying the concentration and crystallization temperature.
K.S. Sastry, R.D. Patel
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