Results 121 to 130 of about 1,552 (162)
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Inorganica Chimica Acta, 2002
Abstract Methylalumoxane (MAO) is an active pre-catalyst for the polymerization of isobutylene and the copolymerization of isobutylene with isoprene at ambient temperature. The absence of any proton-containing substances suggests that the solvent dichloromethane reacts with the MAO forming the active cationic species.
Anatoly Lisovskii +4 more
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Abstract Methylalumoxane (MAO) is an active pre-catalyst for the polymerization of isobutylene and the copolymerization of isobutylene with isoprene at ambient temperature. The absence of any proton-containing substances suggests that the solvent dichloromethane reacts with the MAO forming the active cationic species.
Anatoly Lisovskii +4 more
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Homologous Poly(isobutylene)s: Poly(isobutylene)/High-Density Poly(ethylene) Hybrid Polymers
Macromolecules, 2008We report on the synthesis of poly(homo-isobutylene) and poly(homo-α-methylstyrene) and the thermal properties of these new polymers.
Wolfgang H. Binder +7 more
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Cationic telomerization of isobutylene
Polymer Bulletin, 1982Cationic telomerization has been attempted by reacting BF3 onto isobutylene in the presence of acetic anhydride: Under proper experimental conditions, we obtained only one product — a cetoester monoadduct CH3COCH2-C(CH3)2-O-COCH3 -. In order to study the initiation step, we have reacted a preformed salt CH3CO+SbF6− onto isobutylene in the presence of ...
F. Clouet +3 more
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1977
Lack of efficient, easily controllable cationic grafting techniques have, until recently, precluded the use of this technique for the preparation of well defined graft copolymers (1). The “grafting onto” approach has been used by Haas and coworkers (1).
James Oziomek, Joseph P. Kennedy
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Lack of efficient, easily controllable cationic grafting techniques have, until recently, precluded the use of this technique for the preparation of well defined graft copolymers (1). The “grafting onto” approach has been used by Haas and coworkers (1).
James Oziomek, Joseph P. Kennedy
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Perfluoroalkylation of isobutylene and toluene
Bulletin of the Academy of Sciences, USSR Division of Chemical Science, 19661. The thermal alkylation of isobutylene with perfluoroisobutylene was carried out, and a linear dimer was obtained. As a result of thermal alkylation of isobutylene with perfluoropropylene, a cyclodimer and a linear dimer were obtained. 2. Cyclodimerization ofϕ-propylene with isobutylene proceeds according to the “head to head” type.
I. L. Knunyants, E. Ya. Pervova
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Living Polymerization of Isobutylene
1987Truly living polymerizations, i.e., polymerizations that proceed in the absence of termination and chain transfer, are a most desirable objective of the synthetic polymer chemist. Living polymerizations are not only of great scientific interest but also of considerable commercial consequence and several modern industrial processes are based on living ...
R. Faust, J. P. Kennedy
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Heat regime in isobutylene polymerization
Polymer Science U.S.S.R., 1988The thermodynamics of isobutylene polymerization in adiabatic conditions in analyzed. The limits of possible heating of the initial mixture (monomer-solvent) during polymerization of the monomer are determined, as well as the effects of solvent and monomer boiling on the temperature regime of the polymerization reaction, and of excess heat removal by ...
Al.Al. Berlin +5 more
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Cationic oligomerization of isobutylene oxide
Polymer Bulletin, 1978Dioxolane type dimer and trioxane type trimer were the principal product in the cationic polymerization of isobutylene oxide at room temperature. At low temperature polymer formation accompanied by dioxane type dimer through back-biting reaction was predominant. At room temperature, hydride transfer occurs easily to form isomerized oligomers.
Yuya Yamashita, Katsumi Iwao, Koichi Ito
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Alkylation of thiophene with isobutylene
Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 19671. The yield of tert-butylthiophene reaches 73% if the alkylation of thiophene with isobutylene is run employing static conditions, under pressure, in the presence of H3PO4/kieselguhr catalyst. 2. The ratio of the 2-: 3-isomers decreases from 3.0∶1 down to 2.2∶1 when the temperature is raised from 75 up to 175°.
N. I. Shuikin, B. L. Lebedev
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