The Coil-to-Globule-to-Coil Transition of Linear Polymer Chains in Dilute Aqueous Solutions: Effect of Intrachain Hydrogen Bonding
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摘要Our previous studies of the captioned transition have shown that thermally sensitive poly(N-isopropylacrylamide) (PNIPAM) in water can form stable individual single-chain globules, but not for polystyrene (PS) in cyclohexane. In the current study, using poly(N,N-diethylacrylamide) (PDEAM) (M-w = 1.7 x 10(7) g/Mol and M-w/M-n = 1.06) with no hydrogen donator site, we intend to find whether the intrachain hydrogen bonding plays a role in stabilizing individual collapsed PNIPAM single-chain globules. We found that PDEAM can also form stable single-chain globules in water even though the transition is less sharp. The resultant individual PDEAM single-chain globules are less compact, reflecting in a lower chain density and a higher ratio of the radius of gyration to hydrodynamic radius, presumably due to the lack of intrachain hydrogen bonding. Our result also shows that, unlike PNIPAM, there is no hysteresis in the transition, indirectly supporting our previous assumption that the hysteresis observed for PNIPAM is due to the formation of some intrachain additional hydrogen bonds formed in the collapsed state.
著者Zhou KJ, Lu YJ, Li JF, Shen L, Zhang GZ, Xie ZW, Wu C
期刊名稱Macromolecules
出版年份2008
月份11
日期25
卷號41
期次22
出版社American Chemical Society
頁次8927 - 8931
國際標準期刊號0024-9297
電子國際標準期刊號1520-5835
語言英式英語
Web of Science 學科類別Polymer Science; POLYMER SCIENCE

上次更新時間 2021-20-02 於 00:28