Influence of Spacer Length between Actuator and Sensor on Their Mutual Communications in Poly(N-Isopropylacrylamide-co-尾-Cyclodextrin), an Autonomous Coordinative Shrinking/Swelling Poly

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• 作者：Hidenori Ohashi ; Tomoaki Abe ; Takanori Tamaki ; Takeo Yamaguchi
• 刊名：Macromolecules
• 出版年：2012
• 出版时间：December 21, 2012
• 年：2012
• 卷：45
• 期：24
• 页码：9742-9750
• 全文大小：619K
• 年卷期：v.45,no.24(December 21, 2012)
• ISSN：1520-5835

文摘

In living bodies, specific molecular recognition triggers various kinds of autonomous behaviors. To artificially reconstruct one such distinct phenomenon, an autonomous shrinking and subsequent reswelling of poly(N-isopropylacrylamide) (pNIPAM) having a 尾-cyclodextrin (CD) pendant group was induced by a specific signal of a guest molecule for CD, 8-anilino-1-naphthalenesulfonic acid. The autonomous phenomenon is realized as a consequence of mutual influences between the pNIPAM main chain as actuator and the CD moiety as sensor. The mutual communications were found to have quite different dependence on the length of the spacer connecting pNIPAM and CD; a long spacer hinders the communication from CD to pNIPAM, whereas a short spacer does not. However, the reverse communication from pNIPAM to CD is maintained even with long spacers, possibly because of the pNIPAM main chain spatially close to the CD moiety. This knowledge is useful for the design of highly functional polymeric materials conjugating sensors and actuators.