Results 131 to 140 of about 6,513 (187)
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Macromolecules, 1986
Hydrogenation de polybutadienes-1,4 et 1,2 atactique ou syndiotactique, a 100°C sous 50 bar d'hydrogene, en presence de (PPh) 3 ...
Yoshiharu Doi +3 more
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Hydrogenation de polybutadienes-1,4 et 1,2 atactique ou syndiotactique, a 100°C sous 50 bar d'hydrogene, en presence de (PPh) 3 ...
Yoshiharu Doi +3 more
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Rubber Chemistry and Technology, 1967
Abstract Polybutadienes made with six different catalyst systems were examined: (1) butyllithium, (2) “nickel-based”, (3) alfin, (4) “titanium-based”, (5) “cobalt-based”, and (6) free radical emulsion. The microstructure and macrostructure of the polybutadienes have been determined and are compared to the results published in the literature ...
W. S. Bahary, D. I. Sapper
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Abstract Polybutadienes made with six different catalyst systems were examined: (1) butyllithium, (2) “nickel-based”, (3) alfin, (4) “titanium-based”, (5) “cobalt-based”, and (6) free radical emulsion. The microstructure and macrostructure of the polybutadienes have been determined and are compared to the results published in the literature ...
W. S. Bahary, D. I. Sapper
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Journal of Applied Polymer Science, 2004
AbstractA series of polyurethane (PU) films made from toluene diisocyanate (TDI), 1,4‐butanediol (BDO), and hydroxyl‐terminated polybutadiene (HTPB), hydroxyl terminated polybutadiene/styrene (HTBS), or hydroxyl terminated polybutadiene/acrylonitrile (HTBN) was synthesized by solution polymerization.
Yurun Yang +5 more
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AbstractA series of polyurethane (PU) films made from toluene diisocyanate (TDI), 1,4‐butanediol (BDO), and hydroxyl‐terminated polybutadiene (HTPB), hydroxyl terminated polybutadiene/styrene (HTBS), or hydroxyl terminated polybutadiene/acrylonitrile (HTBN) was synthesized by solution polymerization.
Yurun Yang +5 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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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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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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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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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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