Results 181 to 190 of about 10,860 (230)
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Photoisomerization of polybutadiene
Journal of Polymer Science Part C: Polymer Symposia, 1967AbstractPolybutadiene, in the solid state, and in the absence of added sensitizer, undergoes photochemical cis‐trans isomerization and loss of unsaturation when irradiated in vacua with krypton 1236 A. or mercury 2537 A. radiation. The estimated quantum yields for these two reactions are 0.25 and 1.53, respectively, for the krypton irradiations, and 0 ...
M. A. Golub, C. L. Stephens
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Macromolecules, 2003
Atomistic simulations of two isomers of polybutadiene (PB), cis-1,4-PB and 1,2-PB, have been conducted using the end-bridging Monte Carlo algorithm.
P. Gestoso +3 more
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Atomistic simulations of two isomers of polybutadiene (PB), cis-1,4-PB and 1,2-PB, have been conducted using the end-bridging Monte Carlo algorithm.
P. Gestoso +3 more
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Journal of Polymer Science, 1955
AbstractA detailed study has been made of the intrinsic viscosity‐molecular weight relationship for a polybutadiene prepared at 50°C. and one prepared at 5°C. Original fractions were at least twice refractionated from very dilute solutions in an attempt to obtain fairly sharp distributions. Fox‐Flory K constants are observed to decrease with increasing
D. J. Pollock +2 more
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AbstractA detailed study has been made of the intrinsic viscosity‐molecular weight relationship for a polybutadiene prepared at 50°C. and one prepared at 5°C. Original fractions were at least twice refractionated from very dilute solutions in an attempt to obtain fairly sharp distributions. Fox‐Flory K constants are observed to decrease with increasing
D. J. Pollock +2 more
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Near‐IR spectrum of polybutadiene
Journal of Polymer Science Part A: Polymer Chemistry, 1996Abstract : The vibrational overtone spectrum of polybutadiene was recorded up to 14,000/cm and interpreted in the local mode model. The methylenic and olefinic CH stretch progressions, with anharmonicities of 66 and 59/cm, respectively, were identified for delta v = 2, 3,4 and 5.
D. L. Snavely, C. Angevine
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Sequence distribution of 1,4‐polybutadienes
Die Makromolekulare Chemie, 1977AbstractThe spin‐decoupled 1H NMR and 13C NMR methods were presented for the determination of the cis‐trans sequence distribution in polybutadiene. Poly(butadiene‐2,3‐d2) and cis‐trans isomerized polybutadienes were used for the peak assignment and the resonance of methylene protons in cis‐trans linkage could be described as an A2B2 system.
Yasuyuki Tanaka +4 more
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Journal of Macromolecular Science: Part A - Chemistry, 1985
Abstract Polybutadiene (PB) can be easily halogenated by reaction with iodine chloride or bromine in tetrahydrofuran. The resulting glassy polymers were reacted with n-butyllithium, sec-butyl-lithium, and polystyryllithium in THF. Iodochlorinated PB gave a polybutadiene with a different cis/trans ratio with n-BuLi. The reformation of PB was accompanied
E. Ceauşescu +5 more
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Abstract Polybutadiene (PB) can be easily halogenated by reaction with iodine chloride or bromine in tetrahydrofuran. The resulting glassy polymers were reacted with n-butyllithium, sec-butyl-lithium, and polystyryllithium in THF. Iodochlorinated PB gave a polybutadiene with a different cis/trans ratio with n-BuLi. The reformation of PB was accompanied
E. Ceauşescu +5 more
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Solvent-polymer interactions in polybutadienes
Macromolecules, 1993Infinite-dilution activity coefficients of 26 solvents in three polybutadienes were determined by inverse gas chromatography in the temperature range 40-100°C. The polybutadienes have well-characterized structure and different molecular weights. The data are useful for the development of thermodynamic models for polymer-solvent interaction and for ...
ALESSI, PAOLO +3 more
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Macromolecules, 1993
The effect of peroxide cross-linking on the phase diagram and the scattering function for a critical mixture of perdeuterated polybutadiene (DPB) and protonated polybutadiene (HPB) has been examined by small-angle neutron scattering as a function of temperature. The scattering curves for the cross-linked blends were essentially temperature independent.
Hiroshi Jinnai +4 more
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The effect of peroxide cross-linking on the phase diagram and the scattering function for a critical mixture of perdeuterated polybutadiene (DPB) and protonated polybutadiene (HPB) has been examined by small-angle neutron scattering as a function of temperature. The scattering curves for the cross-linked blends were essentially temperature independent.
Hiroshi Jinnai +4 more
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Rheological Properties of Multichain Polybutadienes
Rubber Chemistry and Technology, 1965Abstract The introduction of one or two long chain branches into a polybutadiene molecule to form trichain or tetrachain molecules, respectively, leads to profound changes in Theological behavior. At low molecular weights the Newtonian (zero shear) viscosity is decreased relative to a linear polymer of the same molecular weight.
Gerard Kraus, J. T. Gruver
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Kurzkettige, lineare polybutadiene
Die Angewandte Makromolekulare Chemie, 1971AbstractMit ZIEGLER‐NATTA‐Katalysatoren aus Alkylaluminiumchloriden in Kombnination mit Kobalt‐ und/oder Nickelverbindungen können in einem nahtlosen Übergang 1,4‐cis‐Polybutadiene mit Molekulargewichten von 500 000 und mehr bis zusolchen mit Molekulargewichtenn von etwa 500 hergestellt werden.
Von Bernhard Schleimer, Heinrich Weber
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