SYNTHESIS OF A MODEL 3-MIKTOARM STAR TERPOLYMER
SYNTHESIS OF A MODEL 3-MIKTOARM STAR TERPOLYMER
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DOI：
10.1021/ma00044a028
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发表时间：
1992-08-31
期刊：
影响因子：
5.5
通讯作者：
HADJICHRISTIDIS, N
中科院分区：
文献类型：
--
作者：
IATROU, H;HADJICHRISTIDIS, N
描述了具有三个不同臂（即聚异戊二烯、聚苯乙烯和聚丁二烯）的明确的、近单分散的起始三元共聚物的合成。该合成方法涉及聚异戊二烯基锂与过量的甲基三氯硅烷的反应，然后在除去过量的甲基三氯硅烷后，通过化学计量添加（滴定）聚苯乙烯基锂，最后添加少量过量的聚丁二烯基锂。不同活性聚合物的添加顺序非常关键。连接后，用甲醇封端过量的聚丁二烯基锂并通过分馏除去。通过尺寸排阻色谱法、小角度激光光散射、激光差示折光法、渗透压测定法以及核磁共振和紫外光谱法进行表征。
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.