SYNTHESIS OF A MODEL 3-MIKTOARM STAR TERPOLYMER

被引:225
作者
IATROU, H [1 ]
HADJICHRISTIDIS, N [1 ]
机构
[1] UNIV ATHENS,DEPT CHEM,GR-15771 ATHENS,GREECE
关键词
D O I
10.1021/ma00044a028
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The synthesis of a well-defined, near monodisperse, star terpolymer with three different arms, i.e., polyisoprene, polystyrene, and polybutadiene, is described. The synthetic approach involves the reaction of polyisoprenyllithium with an excess of methyltrichlorosilane followed, after removal of the excess of methyltrichlorosilane, by a stoichiometric addition (titration) of polystyrillithium and finally by a small excess of polybutadienyllithium. The sequence of the addition of the different living polymers is very critical. After linking, the excess of the polybutadienyllithium was terminated with methanol and removed by fractionation. Characterization was carried out by size-exclusion chromatography, low-angle laser light scattering, laser differential refractometry, osmometry, and NMR and UV spectroscopy.
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页码:4649 / 4651
页数:3
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