Abstract
Star-shaped polymers (4) that consist of poly(p-alkoxystyrene) arms and a microgel core of a divinyl compound (1b) were synthesized in high yield (>95%) on the basis of the living cationic polymerization with the HI/ZnI2 initiating system. For example, the polymerization of p-methoxystyrene (pMOS) with HI/ZnI2 at −15 °C in methylene chloride led to a living polymer, which was subsequently allowed to react with a small amount of the linking agent 1b [CH2CHC6H4O(CH2)3OC6H4CHCH2] to give star-shaped polymers 4, soluble in common organic solvents including chloroform, methylene chloride, and THF. The Mw (by light scattering) of 4 ranged from 5 × 104 to 60 × 104, and the number of arms from 7 to 50 per molecule, which increased with increasing [1b]0/[living end] ratio. Similar results were obtained with p-tert-butoxystyrene having a bulkier substituent than pMOS. In contrast to the bis(alkoxystyrene)-type compound 1b, the use of a bifunctional vinyl ether [1a; CH2CHOCH2CH2OC6H4C(CH3)2C6H4OCH2CH2OCHCH2] as a l...
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