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タイトル: | Salt-dependent surface activity and micellization behaviour of zwitterionic amphiphilic diblock copolymers having carboxybetaine |
著者: | Murugaboopathy, Sivanantham Matsuoka, Hideki |
著者名の別形: | 松岡, 秀樹 |
キーワード: | Non-surface activity Carboxybetaine Zwitterionic polymer Block copolymer Polymer micelle |
発行日: | May-2015 |
出版者: | Springer Berlin Heidelberg |
誌名: | Colloid and Polymer Science |
巻: | 293 |
号: | 5 |
開始ページ: | 1317 |
終了ページ: | 1328 |
抄録: | Zwitterionic amphiphilic diblock copolymers having n-butylacrylate(n-BA) and carboxybetaine as hydrophobic and hydrophilic blocks, respectively, with various chain lengths were synthesized by the reversible addition-fragmentation chain transfer (RAFT) polymerization method. The effects of salt and chain length on the solution behaviour of zwitterionic amphiphilic diblock copolymers were investigated using surface tension, static light scattering (SLS), dynamic light scattering (DLS) and fluorescence spectroscopic measurements. Surface tension measurements revealed that zwitterionic amphiphilic diblock copolymers undergo transition from surface active to non-surface active after addition of salt. This may be due to the transition from zwitterionic (almost zero charge) to ionic nature of the betaine block by addition of small amount of salt followed by an increase of solvent power of salt solution. Foam formation behaviour decreased with increasing chain length. The critical micelle concentration was decreased drastically by the presence of a small amount of salt, which reflected the non-surface active nature of block copolymer. Increase in values of hydrodynamic radii with increase in salt is attributed to stretching of the hydrophilic chain due to the ionic nature of the block chain and the increase of solvent power. Aggregation number (N agg ) and the second virial coefficient (A2) decreased with the increase in chain length as well as after addition of salt. Packing parameters of block copolymer micelles were less than 0.3 which implies that the micellar shape is spherical. Some unique aspects of zwitterionic polymer were elucidated, which are largely different from simple ionic (anionic and cationic) polymers. |
記述: | First online: 25 January 2015 |
著作権等: | The final publication is available at Springer via http://dx.doi.org/10.1007/s00396-015-3503-1. The full-text file will be made open to the public on 25 January 2016 in accordance with publisher's 'Terms and Conditions for Self-Archiving'. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 This is not the published version. Please cite only the published version. |
URI: | http://hdl.handle.net/2433/202052 |
DOI(出版社版): | 10.1007/s00396-015-3503-1 |
出現コレクション: | 学術雑誌掲載論文等 |
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