Results 131 to 140 of about 6,260 (167)
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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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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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INFRARED SPECTRA OF POLYBUTADIENES. NOTE I: SYNDIOTACTIC-1,2 POLYBUTADIENE
1967ABSTRACT The infrared spectrum of syndiotactic-1,2 polybutadiene was studied on polymer prepared by polymerization of butadiene with the aid of a catalyst based on triethyl aluminum and vanadium triacetylacetonate, and subsequent cold extraction with benzene.
D. MORERO, E. MANTICA, L. PORRI
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2009
Abstract Major Applications With one chiral center, 1,2-polybutadiene can exist in the amorphous atactic form and two crystalline forms: isotactic and syndiotactic. In the formation of 1,2-polybutadiene, it is believed that the syn p-allyl form yields the syndiotactic structure, while the anti p-allyl form yields the isotactic structures.
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Abstract Major Applications With one chiral center, 1,2-polybutadiene can exist in the amorphous atactic form and two crystalline forms: isotactic and syndiotactic. In the formation of 1,2-polybutadiene, it is believed that the syn p-allyl form yields the syndiotactic structure, while the anti p-allyl form yields the isotactic structures.
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Crazing in polystyrene-polybutadiene diblock copolymers containing cylindrical polybutadiene domains
Polymer, 1985Abstract Polystyrene-polybutadiene diblock copolymers exhibiting morphologies of cylindrical rubbery domains in a glassy matrix were studied in tensile stress-strain experiments. The various contributions of rubber volume fraction, overall copolymer molecular weight, and blending of diblock copolymers with homopolymers were examined.
C.E. Schwier, A.S. Argon, R.E. Cohen
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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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Polybutadiene adhesive compositions
Journal of Applied Polymer Science, 1979AbstractThis paper deals with the development of adhesives that are useful for preparing flexible laminates. The adhesive compositions are based on the chemistry of 1,2‐polybutadiene polymers and their reactions via chain extension and epoxidation.
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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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2009
Abstract Major Applications Tire treads, carcass, belts, hoses, gaskets, seals, and protective coatings; component in other synthetic rubbers and blends. Properties of Special Interest Good low-temperature properties and adhesion to metals; good resilience, durability, and abrasion resistance.
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Abstract Major Applications Tire treads, carcass, belts, hoses, gaskets, seals, and protective coatings; component in other synthetic rubbers and blends. Properties of Special Interest Good low-temperature properties and adhesion to metals; good resilience, durability, and abrasion resistance.
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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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