Polymerization of isobutylene and copolymerization of isobutylene with isoprene promoted by methylalumoxane

TY - JOUR

T1 - Polymerization of isobutylene and copolymerization of isobutylene with isoprene promoted by methylalumoxane

AU - Lisovskii, Anatoly

AU - Nelkenbaum, Elza

AU - Volkis, Victoria

AU - Semiat, Rafi

AU - Eisen, Moris S.

N1 - Funding Information: This research was supported by the Ministry of Science in Israel, under contact 83/01-1, by the fund for the promotion of research at the Technion, and by the Technion VPR Fund P. and E. Nathan Research Fund. M.S.E. thanks the Humboldt Foundation for support during the preparation of this manuscript.

PY - 2002/5/30

Y1 - 2002/5/30

N2 - 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. In the presence of toluene, as the solvent, the reaction rate is extremely low. The increase of the MAO concentration in the reaction mixture causes a large increase in the isobutylene conversion, although the molecular weight of the polymers sharply decreases. The use of CD2Cl2 as a solvent induces a large kinetic isotope effect (KIE=7). In the copolymerization of isobutylene with large amounts of isoprene a cross-linkage copolymer is formed. The polymerization and copolymerization reactions were also studied in the presence of a mixture of MAO with the complex (acac)2TiCl 2 (acac=acetylacetonate).

AB - 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. In the presence of toluene, as the solvent, the reaction rate is extremely low. The increase of the MAO concentration in the reaction mixture causes a large increase in the isobutylene conversion, although the molecular weight of the polymers sharply decreases. The use of CD2Cl2 as a solvent induces a large kinetic isotope effect (KIE=7). In the copolymerization of isobutylene with large amounts of isoprene a cross-linkage copolymer is formed. The polymerization and copolymerization reactions were also studied in the presence of a mixture of MAO with the complex (acac)2TiCl 2 (acac=acetylacetonate).

KW - Copolymerization

KW - Isobutylene

KW - Isoprene

KW - Methylalumoxane

KW - Polymerization

UR - http://www.scopus.com/inward/record.url?scp=0347599776&partnerID=8YFLogxK

U2 - 10.1016/S0020-1693(02)00799-5

DO - 10.1016/S0020-1693(02)00799-5

M3 - 文章

AN - SCOPUS:0347599776

SN - 0020-1693

VL - 334

SP - 243

EP - 252

JO - Inorganica Chimica Acta

JF - Inorganica Chimica Acta

ER -