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The polymerization of isoprene by Ti(OBu)<SUB>4</SUB> -AlEt<SUB>2</SUB>Cl and Ti(OBu)<SUB>4</SUB> -AlEt<SUB>3</SUB> catalysts to which AIX, was added has been investigated.<BR>In Ti(OBu)<SUB>4</SUB> -AlEt<SUB>2</SUB>Cl-AlX<SUB>3</SUB> catalysts, the maximum activity of polymerization is exhibited when AlEt<SUB>2</SUB>Cl/AlX<SUB>3</SUB>= 3 and total Al/Ti = 8 (represented as CAT I -X); and in Ti (OBu)<SUB>4</SUB> -AlEt<SUB>3</SUB> -Al X<SUB>3</SUB> catalysts, when AlEt<SUB>3</SUB>/AlX<SUB>3</SUB>=1 and total Al/Ti = 7-8 (represented as CAT-II-X). By CAT-I -Br and CAT- II -Br, cis-1, 4-polymer with high molecular weight, [η ] >4, is easily obtained.<BR>The rate equations in the case of both catalysts are of first order with respect to concentration of isoprene and the activation energies are from 8.7 to 12.0 kcal/mol.<BR>The number average molecular weight, M<SUB>n</SUB>, of the polymers obtained by CAT I -Br and CAT-II -Br is larger and M<SUB>w</SUB> /M<SUB>n</SUB> value is smaller than those of the polymers obtained by CAT I -Cl and CAT II -Cl. Then, it was assumed that the less degree of chain transfer occurred in the polymerization by the catalysts which contained AlBr<SUB>3</SUB>.
- 公益社団法人 日本化学会の論文
公益社団法人 日本化学会 | 論文
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