Response Characteristics of Thermoresponsive Polymers Using Nanomechanical Cantilever Sensors
Response Characteristics of Thermoresponsive Polymers Using Nanomechanical Cantilever Sensors
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DOI：
10.1002/macp.200900081
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发表时间：
2009-08
影响因子：
2.5
通讯作者：
C. R. Bradley;N. Jalili;S. Nett;Li-Qiang Chu;R. Förch;J. Gutmann;R. Berger
中科院分区：
文献类型：
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作者：
C. R. Bradley;N. Jalili;S. Nett;Li-Qiang Chu;R. Förch;J. Gutmann;R. Berger
我们研究了在纳米机械悬臂梁传感器（NCS）上制备的热响应聚合物薄膜的涂层：（i）PNIPAM刷，和（ii）互连的ppDEA聚合物。在水中从22 ° C加热到50°C时，测量到在31.9 ± 1.7°C（PNIPAM）和47.7 ± 1.9 °C（ppDEA）之间的差异偏转的最小值。微弯的最小值与薄膜的低临界溶解温度（LCST）有关。在LCST以下，NCS偏转对应于与脱水相关的朝向热响应聚合物膜侧的弯曲。在较高温度下，偏转反向，即，远离聚合物涂层。这种响应主要归因于塌陷的聚合物和NCS材料之间的双材料效应。PNIPAM刷层和ppDEA膜的LCST接近本体聚合物的报告值。
We investigated coatings of thermally responsive thin polymer films prepared on nanomechanical cantilever sensor (NCS): (i) a PNIPAM brush, and (ii) an interlinked ppDEA polymer. Upon heating from 22 to 50°C in water, a minimum in the differential deflection between 31.9 ± 1.7°C (PNIPAM) and 47.7 ± 1.9 °C (ppDEA) was measured. The minimum in differential deflection can be associated with the lower critical solution temperature (LCST) of the films. Below the LCST the NCS deflection corresponds to a bending toward the thermally responsive polymer film side, associated to dehydration. At higher temperature, the deflection was reversed, i.e., away from the polymer coating. This response is mainly attributed to a bimaterial effect between the collapsed polymer and the NCS material. The LCST of the PNIPAM brush layer and the ppDEA film were close to that reported for the bulk polymers.