The present invention relates to telechelic polymers having crosslinkable end
groups of the formula
##STR1##
and methods for preparing the same wherein n is an integer;
##STR2##
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
##STR3##
wherein:
- M is ruthenium or osmium;
- X and X1 are independently any anionic ligand;
- L and L1 are any neutral electron donor ligand;
R and R1 are each hydrogen or a substituted or unsubstituted
substituent wherein the substituent is selected from the group consisting of C1-C20
alkyl, C2-C20 alkenyl, C2-C20 alkynyl,
aryl, C1-C20 carboxylate, C1-C20 alkoxy,
C1-C20 alkenyloxy, C2-C20 alkynyloxy,
aryloxy, C2-C20 alkoxycarbonyl, C1-C20 alkylthio,
C1-C20 alkylsulfonyl and C1-C20 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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