Abstract
(4-Vinylbenzyl)polystyrene macromonomer (PStM, Mn = 5.45 × 103, Mw/Mn = 1.03) was living-anionically polymerized by sec-BuLi to produce the (PSt)n- star polymer under high vacuum at room temperature. Then, isoprene (Is) was sequentially copolymerized by (PSt)n- to yield the (PSt)6.1-s-(PIs)1 star block copolymer (Mn = 6.39 × 104, Mw/Mn = 1.04) having a narrow PIs composition distribution. Similarly, the (PIs)6.6-s-(PSt)1 star block copolymer (Mn = 10.8 × 104, Mw/Mn = 1.04) was prepared using (4-vinylbenzyl)polyisoprene macromonomer (PIsM, Mn = 5.19 × 103, Mw/Mn = 1.04). The synthetic route by which the PIs- carbanions copolymerize PStM was found to be unsuitable for preparing (PIs)1-star-(PSt)n. The resultant star polymers and star block copolymers were characterized by a special analysis using a gel permeation chromatograph equipped with a low-angle laser light-scattering detector. The living mechanism of the macromonomers polymerization was discussed from the viewpoint of initiation efficiency. The asym...
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