Results 231 to 240 of about 3,457 (280)
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Emulsion Polymerization of Butadiene
1990The kinetics of the ab initio emulsion polymerization of butadiene was investigated using several emulsifiers and dissociative initiators. The steady polymerization rate in interval II was found to be highly insensitive to variations of the initiator concentration, suggesting a low initiator efficiency.
Weerts, P.A. +2 more
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Macromolecules, 1993
Atomistic models of amorphous poly(1,4-trans-butadiene) and isotactic poly(1,2-butadiene) have been obtained at bulk density by carrying out molecular mechanics and molecular dynamics calculations under periodic boundary conditions, along the lines of the previous study of poly(1,4-cis-butadiene).
Eung-Gun Kim +2 more
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Atomistic models of amorphous poly(1,4-trans-butadiene) and isotactic poly(1,2-butadiene) have been obtained at bulk density by carrying out molecular mechanics and molecular dynamics calculations under periodic boundary conditions, along the lines of the previous study of poly(1,4-cis-butadiene).
Eung-Gun Kim +2 more
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Copolymers of 1,3‐butadiene and 2,3‐dimethyl‐1,3‐butadiene
Journal of Polymer Science, 1949AbstractSome experiments on the polymerization of 2,3‐dimethyl‐1,3‐butadiene and its copolymerization with butadiene are reported. This monomer requires very little modifier as compared to butadiene.
C. S. Marvel, Jack L. R. Williams
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Stereoselective Cyclopropanation by Cyclocopolymerization of Butadiene
Journal of the American Chemical Society, 2002An unprecedented cyclopropanation by cyclopolymerization reaction is presented. In particular, catalytic copolymerization processes of ethene and butadiene lead with high trans selectivity to a complete cyclocopolymerization of butadiene units. Ethene-based copolymers including cyclopropane and cyclopentane rings, which can be relevant to polyolefin ...
PRAGLIOLA, Stefania +3 more
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Cis-1,4-copolymerization of butadiene and 2-alkyl butadienes
Polymer Science U.S.S.R., 1987A neodymium-containing catalytic system has been used to synthesize homopolymers of 2-alkyl butadienes-1,3 (A), where the alkyl is ethyl or isopropyl, and the copolymers of A with butadiene-1,3 (B) mostly containing (>95%) cis-1,4-units (1H and 13C NMR).
K.D. Skuratov +3 more
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Enzymatic Hydration of Butadiene Monoxide and Its Importance in the Metabolism of Butadiene
19821,3-Butadiene is a major industrial chemical used in the production of synthetic elastomers such as polybutadiene and styrene-butadiene rubber (SBR). Like most of the unsaturated olefins, butadiene is metabolized in vivo. The first step of its biotransformation is the cytochrome P-450-dependent epoxidation to butadiene monoxide (Malvoisin et al, 1979).
E, Malvoisin, M, Mercier, M, Roberfroid
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The characteristic ratio of butadiene-styrene and butadiene-acrylonitrile copolymers
Collection of Czechoslovak Chemical Communications, 1983A method advanced recently is used to estimate the characteristic ratio C∞ for statistical butadiene-styrene and butadiene-acrylonitrile copolymers from the reported data of the limiting viscosity number and sedimentation coefficient. The results are compared with those of the traditional methods.
Miloslav Bohdanecký, Vladimír Petrus
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Photoionization of 1,3-Butadiene, 1,2-Butadiene, Allene, and Propyne
The Journal of Chemical Physics, 1968Using a photoionization mass spectrometer, the ionization potentials of the parent molecules and the appearance potentials of the fragment ions, observed below 13 eV, have been determined for 1,3-butadiene, 1,2-butadine, allene, and propyne. The ionization potentials of 1,3-butadiene are 9.07 ± 0.02 eV, 9.80 ± 0.04 eV, and 11.7 ± 0.04 eV. The adiabatic
Albert C. Parr, Fred A. Elder
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Rubber Chemistry and Technology, 1944
Abstract 1. The most prominent polymerization of pure butadiene in the absence of peroxides is dimerization. This reaction is thermally activated, and does not appear to be catalyzed by peroxides or by steel surfaces. 2. Butadiene is also capable of independent polymerization to high-molecular-weight polymer, but in the absence of peroxides ...
Richard F. Robey +2 more
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Abstract 1. The most prominent polymerization of pure butadiene in the absence of peroxides is dimerization. This reaction is thermally activated, and does not appear to be catalyzed by peroxides or by steel surfaces. 2. Butadiene is also capable of independent polymerization to high-molecular-weight polymer, but in the absence of peroxides ...
Richard F. Robey +2 more
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The Thermal Dimerization of Butadiene, and the Equilibrium between Butadiene and Vinylcyclohexene
The Journal of Chemical Physics, 1952The kinetics of the dimerization of butadiene and of the dissociation of vinylcyclohexene have been considered in the light of thermodynamic equilibrium calculations. The lack of accord between the results is resolved if the dissociation of vinylcyclohexene is given by the rate expression kd=5.02×1015exp(−61,800/RT) sec−1.
N. E. Duncan, G. J. Janz
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