Abstract
Star polystyrenes composed of three branches (each branch was different in degree of polymerization (DP)) were synthesized, and the relationship between the elution peak count of gel-permeation chromatographs (GPC) and the DP of each branch was obtained for these star polystyrenes. Then 1: 1 graft copolymer (a backbone having a single branched chain) was synthesized by the coupling reaction of polystyryl anion with chloromethylated polystyrene in tetrahydrofuran (THF) at 20°C. The distribution of grafting sites on the backbone polymer of 1: 1 graft copolymer was derived from the calibration of star polystyrene. It was found that polystyryl anion reacted at the part near an end pendant group of a backbone molecule; the amount reacted increased with increasing DP of polystyryl anion and with decreasing DP of backbone polymer.
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