1991 Volume 48 Issue 2 Pages 97-103
Telechelic polysiloxanes with mesogenic side chains (TLS) were synthesized and their reactions with chelic pelymers were investigated. Functional end groups introduced to TLS were OH. Telechelic polymethylhydrosiloxane (THS) was obtained by acid-catalyzed ring-opening polymerization of 1, 3, 5, 7-tetramethylcyclotetrasiloxane in the presence of an end-capping agent with two OH groups protected with the trifluoroacetyl group. THS was used for hydrosilylation of mesogenic compounds with an allyl group using a platinum catalyst. After removing trifluoroacetyl groups, addition reactions of the TLS with the polymers having an isocyanate group at one end were carried out to give ABA type block copolymers. The highest value of A/B obtained was 1.3 which was obtained when polyethylene glycol monooleyl ether capped with the isocyanate group at its end (degree of polymerization of polyethylene glycol unit, 50) Was used as a chelic polymer. The reactivity of TLS is strongly dependent on the mesogenic side chains, and the stncture of chelic polymers influences the reaction. These results suggest that the conformations of the TLS and chelic polymers play important roles in their reactions. Thermal property of the block copolymer was also examined.
