Pseudopolyrotaxanes made to order: Cucurbituril threaded on polyviologen
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- Title
- Pseudopolyrotaxanes made to order: Cucurbituril threaded on polyviologen
- Authors
- Choi, S; Lee, JW; Ko, YH; Kim, K
- Date Issued
- 2002-04-23
- Publisher
- AMER CHEMICAL SOC
- Abstract
- Pseudopolyrotaxane 2 is synthesized from polyviologen (1) and cucurbituril (CB[61) in water by simple stirring at room temperature. The degree of threading (number of CB[6] beads per repeat unit) can be precisely controlled from 0.1 to 1.0 by controlling the amount of CB[6] added. In 2, CB[61 beads are localized at the middle of the decamethylene units of the polymer through hydrophobic and charge-dipole interactions, to afford a well-defined microstructure in aqueous medium as found by NMR studies. The pseudopolyrotaxane has higher intrinsic viscosity, but a lower shape-dependent Huggins constant, than the parent polymer. This is attributed to a larger hydrodynamic radius and more expanded chain conformation of the pseudopolyrotaxane compared to those of the parent polymer, The decomposition temperature of 2 increases with increasing amount of CB[6] threaded on the polymer.
- Keywords
- DIMENSIONAL COORDINATION POLYMER; SIDE-CHAIN POLYROTAXANES; EVERY STRUCTURAL UNIT; INCLUSION COMPLEXES; MAIN-CHAIN; ALPHA-CYCLODEXTRIN; MOLECULAR NECKLACE; CONDUCTING POLYMETALLOROTAXANES; POLY(ETHYLENE GLYCOL); CROWN-ETHERS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/19115
- DOI
- 10.1021/MA011759D
- ISSN
- 0024-9297
- Article Type
- Article
- Citation
- MACROMOLECULES, vol. 35, no. 9, page. 3526 - 3531, 2002-04-23
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