Results 161 to 170 of about 12,723 (223)
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Relaxation transitions in polybutadiene and in polybutadiene-methylstyrenes
Polymer Science U.S.S.R., 1987Abstract The relaxation transitions in polybutadiene and in its copolymers with methylstyrene were studied by the methods of mechanical relaxation in the range −150–+350°. In this range, up to seventeen transitions of various nature were observed, most of them connected with the butadiene component in the copolymers.
G.M. Bartenev, V.V. Tulinova
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Arborescent Graft Polybutadienes
Macromolecules, 1997Cascade-branched, “graft on graft” polybutadienes, denoted arborescent graft polymers, were prepared by hydrosilylation of polybutadiene vinyl groups with chlorodimethylsilane, followed by grafting with living polybutadiene chains. Repeated hydrosilylation−anionic grafting cycles led to a treelike outward growth, yielding well-defined, spherically ...
Hempenius, Mark A. +2 more
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European Polymer Journal, 2004
The sorption and diffusion behavior of ethanol vapor in series of polyolefine based polyurethanes (PU) made from hydroxyl-terminated polybutadiene/acrylonitrile (HTBN), hydroxyl-terminated polybutadiene/styrene (HTBS) and hydroxyl-terminated polybutadiene (HTPB) were investigated by using the quartz-spring, DSC, FTIR and AFM. The equilibrium absorption
Yurun Yang +4 more
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The sorption and diffusion behavior of ethanol vapor in series of polyolefine based polyurethanes (PU) made from hydroxyl-terminated polybutadiene/acrylonitrile (HTBN), hydroxyl-terminated polybutadiene/styrene (HTBS) and hydroxyl-terminated polybutadiene (HTPB) were investigated by using the quartz-spring, DSC, FTIR and AFM. The equilibrium absorption
Yurun Yang +4 more
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Macromolecules, 1998
The effect of the microstructure on the phase behavior of mixtures of polybutadiene (PB) and poly(ethylene-co-1-butene) (PEB) with polystyrene (PS) has been investigated. A series of PBs with 1,2-addition content ranging from 7 to 93% were synthesized by anionic polymerization, and a portion of each was subsequently hydrogenated to yield PEB.
Chang Dae Han +7 more
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The effect of the microstructure on the phase behavior of mixtures of polybutadiene (PB) and poly(ethylene-co-1-butene) (PEB) with polystyrene (PS) has been investigated. A series of PBs with 1,2-addition content ranging from 7 to 93% were synthesized by anionic polymerization, and a portion of each was subsequently hydrogenated to yield PEB.
Chang Dae Han +7 more
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Hydrogenation of Polybutadiene at High Pressure
Industrial & Engineering Chemistry Research, 2021Fil: Menossi, Matias. Universidad Nacional de Córdoba. Instituto de Investigación y Desarrollo en Ingeniería de Procesos y Química Aplicada. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba.
Matías Menossi +4 more
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Synthesis of isoprenic polybutadiene macromonomers for the preparation of branched polybutadiene
European Polymer Journal, 2019Abstract Polybutadiene macromonomers with a high 1,4-microstructure content and a polymerizable isoprene end group were synthesized by termination of living polybutadienyllithium chains. While different isoprene derivatives were investigated as terminating agents for the preparation of the macromonomers, 2-bromomethyl-1,3-butadiene provided the best ...
Vishnu D. Deepak, Mario Gauthier
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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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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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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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