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3566635 
Journal Article 
Synthesis of styrene and tetrahydrofuran block copolymers by in situ transformation 
Liu, YF; Wan, XL; Ying, SK 
2000 
1 
Progress in Natural Science
ISSN: 1002-0071 
Science Press 
10 
2 
117-123 
English 
WOS:000088688400005 
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) CCl4/BDE/CuCl system. With these monofunctional
initiator or difunctional 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 (H-1-NMR), gel permeation chromatography (GPC) and
differential scanning calorimetry (DSC) indicated this method is simple and feasible. 
living free radical polymerization; ring-opening polymerization; synthesis poly (styrene-b-tetrahydrofuran); block copolymer