Preparation of amphiphilic diblock copolymers with pendant hydrophilic phosphorylcholine and hydrophobic dendron groups and their self‐association behavior in water |
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Authors: | Kazuki Osawa Toyoko Imae Masaki Ujihara Atsushi Harada Kanako Ochi Kazuhiko Ishihara Shin‐ichi Yusa |
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Institution: | 1. Department of Materials Science and Chemistry, University of Hyogo, , Himeji, Hyogo, 671‐2280 Japan;2. Graduate Institute of Applied Science and Technology and Department of Chemical Engineering, National Taiwan University of Science and Technology, , Taipei, 10607 Taiwan;3. Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, , Osaka, 599‐8531 Japan;4. Department of Materials Engineering and Department of Bioengineering, School of Engineering, The University of Tokyo, , Tokyo, 113‐8656 Japan |
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Abstract: | Generation 3.5 poly(amido amine) dendron (G3.5) with 16 n‐butyl terminal groups containing an acrylamide monomer (AaUG3.5) was prepared by condensation between an amino focal group in G3.5 and 11‐acrylamidoundecanoic acid. AaUG3.5 was polymerized using poly(2‐methacryloyloxyethyl phosphorylcholine) (pMPC)‐based macro‐chain transfer agent via reversible addition‐fragmentation chain transfer (RAFT) radical polymerization to obtain amphiphilic diblock copolymers with different compositions. The diblock copolymers (PmDn) were composed of a hydrophilic pMPC block and hydrophobic pendant dendron‐bearing block, where P and D represent pMPC and pAaUG3.5, respectively, and m and n represent the degree of polymerization for each block, respectively. P296D1 and P98D3 formed vesicles and large compound micelles and vesicles, respectively, which was confirmed by light scattering measurements and transmission electron microscopic (TEM) observations. The large compound micelles formed from P98D3 could not incorporate hydrophilic guest polymer molecules, because the aggregates did not have a hydrophilic hollow core. In contrast, the vesicles formed from P269D1 could incorporate hydrophilic guest polymer molecules into the hollow core. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013 , 51, 4923–4931 |
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Keywords: | association dendrimers living radical polymerization self‐organization water‐soluble polymers |
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