Abstract
A facile approach to synthesis of a series of coil−rod−coil triblock copolymers by in situ coupling of living diblock copolymers is reported. The living diblock copolymer poly(2-vinylpyridine)-block-poly(n-hexyl isocyanate) (P2VP-b-PHIC) synthesized by anionic polymerization was coupled using malonyl chloride or suberoyl chloride in the presence of pyridine. The triblock copolymers were obtained in ∼94−99% yields without the need for fractionation or separation. The copolymers showed narrow molecular weight distribution (MWD = 1.08−1.14) and good agreement between the calculated and observed molecular weights. In a solvent such as tetrahydrofuran (THF), which is common to both the blocks, the copolymers showed characteristics of microphase separation. With high rod volume fractions lamellar phase separation with long-range order was observed.
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