摘要 |
The present invention relates to telechelic polymers having crosslinkable end groups of the formula and methods for preparing the same wherein n is an integer; is an alkadienyl group; Y is an alkyl group; and Z is crosslinkable end group. In general, the inventive synthesis involves reacting a functionalized chain transfer agent having crosslinkable ends with a cycloalkene in the presence of a ruthenium or osmium catalyst of the formula wherein: M is ruthenium or osmium; X and X<SUP>1 </SUP>are independently any anionic ligand; L and L<SUP>1 </SUP>are any neutral electron donor ligand; R and R<SUP>1 </SUP>are each hydrogen or a substituted or unsubstituted substituent wherein the substituent is selected from the group consisting of C<SUB>1</SUB>-C<SUB>20 </SUB>alkyl, C<SUB>2</SUB>-C<SUB>20 </SUB>alkenyl, C<SUB>2</SUB>-C<SUB>20 </SUB>alkynyl, aryl, C<SUB>1</SUB>-C<SUB>20 </SUB>carboxylate, C<SUB>1</SUB>-C<SUB>20 </SUB>alkoxy, C<SUB>1</SUB>-C<SUB>20 </SUB>alkenyloxy, C<SUB>2</SUB>-C<SUB>20 </SUB>alkynyloxy, aryloxy, C<SUB>2</SUB>-C<SUB>20 </SUB>alkoxycarbonyl, C<SUB>1</SUB>-C<SUB>20 </SUB>alkylthio, C<SUB>1</SUB>-C<SUB>20 </SUB>alkylsulfonyl and C<SUB>1</SUB>-C<SUB>20 </SUB>alkylsulfinyl. In another aspect of the invention, methods for controlling the molecular weight of the resulting telechelic polymer are also presented.
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