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In order to transfer the halogen terminus of polymers for block copolymer synthesis, the in situ transformation of living free radical polymerization of styrene into living cationic ring-opening polymerization of tetrahydrofuran was successfully performed. Three different initiator/catalyst systems of styrene were employed, i.e. (a) PhCH2Cl/ Bpy/CuCl, (b) 1-PEBr/Bpy/CuCl and (c) CCU/BDE/CuCl system. With these monofunctional initiator or difunction-al initiator, both AB and ABA type block copolymers of styrene and tetrahydrofuran were obtained using a silver salt with strong acid (AgClO4) as the transformation agent in the transformation of polymerization type. Characterization of these copolymers by nuclear magnetic resonance hydrogen spectra (1H-NMR) , gel permeation chromatography (GPC) and differential scanning calorimetry (DSC) indicated this method is simple and feasible.
In order to transfer the halogen terminus of polymers for block copolymer synthesis, the in situ transformation of living free radical polymerization of styrene into living cationic ring-opening polymerization of tetrahydrofuran was successfully performed. Three different initiator / catalyst systems of styrene were employed, ie (a) PhCH2Cl / Bpy / CuCl, (b) 1-PEBr / Bpy / CuCl and (c) CCU / BDE / CuCl system. With these monofunctional initiator or difunctional allyl, both AB and ABA type block copolymers of styrene and Characterization of these copolymers by nuclear magnetic resonance hydrogen spectra (1H-NMR), gel permeation chromatography (GPC) and differential scanning calorimetry (DSC) indicated this method is simple and feasible.