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Synthesis of Dendritic Polystyrene-block-Linear Poly(t-butyl acrylate) Copolymers by an Amide Coupling  

Song, Jie (Department of Chemistry and institute of Nanosensor and Biotechnoloty, Dankook University)
Cho, Byoung-Ki (Department of Chemistry and institute of Nanosensor and Biotechnoloty, Dankook University)
Publication Information
Polymer(Korea) / v.33, no.2, 2009 , pp. 158-163 More about this Journal
Abstract
In this study, we synthesized a series of dendritic polystyrene-b-linear poly (t-butyl acrylate) copolymers with well-defined molecular architectures. The hydroxyl group located at the focal point of the second generation dendron bearing polystyrene ($M_n$ = 1000 g/mol) peripheries was converted into amine group via the following stepwise reactions: 1) tosylatoin, 2) azidation, and 3) reduction. On the other hand, the linear poly (t-butyl acrylate)s were prepared by an atom transfer radical polymerization (ATRP) of t-butyl acrylate where benzyl 2-bromopropanoate and Cu(I)Br/PMDETA were used as initiator and catalyst, respectively. To convert the end group of prepared poly (t-butyl acrylate) s into carboxylic acid, a debenzylation was performed using Pd/C catalyst under $H_2$ atmosphere. In the final step, dendritic-linear block copolymers were obtained through a simple amide coupling reaction mediated by 4-(dimethylamino) pyridine(DMAP) and N,N'-diisopropylcarbodiimide(DIPC). The resulting diblock copolymers were shown to have well-defined molecular weights and narrow molecular weight distributions as supported by $^1H$-NMR spectroscopy and gel permeation chromatography(GPC).
Keywords
dendritic-linear diblock copolymer; amide coupling; atom transfer radical polymerization (ATRP);
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