Effect of Host鈥揋uest Interactions on the Cloud Points of Neutral Thermosensitive Homopolymers: Poly(N-n-propylmethacrylamide) and Polymers with Similar Structures
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- 作者：Gang Yuan ; Xiuxiu Yin ; Liang Sun ; Mengqi Cui ; Zhibo Yuan ; Chunyu Wang ; Minxi Yin ; Liyan Wang
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2012
- 出版时间：February 22, 2012
- 年：2012
- 卷：4
- 期：2
- 页码：950-954
- 全文大小：274K
- 年卷期：v.4,no.2(February 22, 2012)
- ISSN：1944-8252
文摘
We investigated effect of cyclodextrins (CDs) on the cloud point of several thermosensitive polymers that are not ionizable. 伪-CD increased the cloud point of the poly(N-n-propylmethacrylamide) (PnPMAm) aqueous solution; by contrast, 尾-CD or 纬-CD did not affect the cloud point of the PnPMAm solution. The cloud point of the PnPMAm solution increased gradually with an increase in the concentration of 伪-CD. Furthermore, we compared the effect of the CDs on the cloud points of four polymers with similar structures. As for poly(N-isopropylacrylamide) (PiPAAm), neither 伪-CD nor 尾-CD affected its cloud point. On the basis of the effect of the differently sized CDs on the cloud point of five polymers and the corresponding NOESY NMR data, we inferred that steric hindrance by the main chain of PiPAAm might be responsible for the bulky CD being unable to form a complex with the short isopropyl group.