Synthesis and characterization of poly (2‐vinylpridine)‐b‐poly (t‐butyl methacrylate)

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Abstract
The synthesis of well defined and monodisperse (Mw/Mn ≤ 1.2) narrow molecular weight distribution poly (2‐vinylpyridine)‐poly (t‐butyl methacrylate) (P2VP‐PTBMA) AB block copolymers is carried out by initiation of 2‐vinylpyridine polymerization by 1,1‐diphenylhexyllithium in THF at‐78°C, followed by addition of TBMA and termination at −78°C using MeOH. The formation of the BAB block copolymer is carried out in a similar fashion except that 1,4‐dilithio‐1,1,4,4‐tetraphenylbutane is used as initiator. The corresponding synthesis of P2VP‐PMMA block copolymers is carried in a similar manner, except that 1‐2 equivalents of TBMA is used to end‐functionalize the living P2VP before the addition of MMA. Without the addition of TBMA, trimodal molecular weight distributions in P2VP‐b‐PMMA are obtained. All the block copolymers are characterized by Size Exclusion Chromatography (SEC), Nuclear Magnetic Resonance (NMR), and Differential Scanning Calorimetry (DSC). © 1994 John Wiley & Sons, Inc.