Isbn: 9783846558539 - controlled polymerization of 1,3-butadiene: cobalt catalytic systems (5 risultati)

Condizione: New.

Taschenbuch. Condizione: Neu. Controlled Polymerization of 1,3-Butadiene | Cobalt Catalytic Systems | Dilip Nath (u. a.) | Taschenbuch | 120 S. | Englisch | 2011 | LAP LAMBERT Academic Publishing | EAN 9783846558539 | Verantwortliche Person für die EU: BoD - Books on Demand, In de Tarpen 42, 22848 Norderstedt, info[at]bod[dot]de | Anbieter: preigu.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -The book described catalytic systems for living polymerization of 1,3-butadiene by CoX2 ( X = Halogens ) combined with MAO as a cocatalyst at 0, 10 and 18 C. The uni-modal molecular weight distribution curves of the resulting polymers shifted toward higher molecular weight regions and became narrower with the increasing of the polymerization time. The number-average molecular weight increased linearly against polymerization time, while the polymer yield exponentially increased in the initial stage. As a consequence, the number of polymer chains calculated from the polymer yield and Mn value increased gradually with polymerization time to reach a steady value. These phenomena were interpreted based on a slow initiation system without any termination and chain transfer reaction. The kinetic analysis indicated that the rates of initiation were significantly influenced by the nature of the halides and descended in the following order, CoCl2 CoBr2>>CoI2>CoF2 = 0, while the rates of propagation were independent on variation of halogen ligands. The effects of other cocatalysts and additive on livingness were also analyzed systematically. 120 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - Print on Demand Titel. Neuware -The book described catalytic systems for living polymerization of 1,3-butadiene by CoX2 ( X = Halogens ) combined with MAO as a cocatalyst at 0, 10 and 18 ¿C. The uni-modal molecular weight distribution curves of the resulting polymers shifted toward higher molecular weight regions and became narrower with the increasing of the polymerization time. The number-average molecular weight increased linearly against polymerization time, while the polymer yield exponentially increased in the initial stage. As a consequence, the number of polymer chains calculated from the polymer yield and Mn value increased gradually with polymerization time to reach a steady value. These phenomena were interpreted based on a slow initiation system without any termination and chain transfer reaction. The kinetic analysis indicated that the rates of initiation were significantly influenced by the nature of the halides and descended in the following order, CoCl2¿CoBr2>>CoI2>CoF2 = 0, while the rates of propagation were independent on variation of halogen ligands. The effects of other cocatalysts and additive on livingness were also analyzed systematically.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 120 pp. Englisch.…

Taschenbuch. Condizione: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - The book described catalytic systems for living polymerization of 1,3-butadiene by CoX2 ( X = Halogens ) combined with MAO as a cocatalyst at 0, 10 and 18 C. The uni-modal molecular weight distribution curves of the resulting polymers shifted toward higher molecular weight regions and became narrower with the increasing of the polymerization time. The number-average molecular weight increased linearly against polymerization time, while the polymer yield exponentially increased in the initial stage. As a consequence, the number of polymer chains calculated from the polymer yield and Mn value increased gradually with polymerization time to reach a steady value. These phenomena were interpreted based on a slow initiation system without any termination and chain transfer reaction. The kinetic analysis indicated that the rates of initiation were significantly influenced by the nature of the halides and descended in the following order, CoCl2 CoBr2>>CoI2>CoF2 = 0, while the rates of propagation were independent on variation of halogen ligands. The effects of other cocatalysts and additive on livingness were also analyzed systematically.…