密度对温敏polymer刷塌陷、压缩和粘附的影响
Density effects on collapse, compression and adhesion of thermoresponsive polymer brushes
摘要：
我们探测，使用表面力装置，热响应的聚（N-异丙基丙烯酰胺）（PNIPAM）刷的各种接枝密度，从等离子体活化的云母通过表面引发聚合生长。因此，我们表明，密集的热敏刷崩溃逐渐随着温度的升高，接枝密度极大地影响他们的溶胀能力：溶胀比的刷子，其特征在于溶胀和塌陷状态之间的厚度变化，被发现减少从$\sim 7$到$\sim 3$的接枝链的数量每单位面积的增加。这样的结果，获得了前所未有的分辨率在接枝密度，提供了定性支持的计算门德斯{ \it等人}。[{ \it Macromolecules} { \bf 2005} { \it 38}，174]。我们进一步表明，在相反的溶胀，两个PNIPAM刷之间的粘附似乎是相当不敏感的分子结构。
英文摘要：
We probe, using the Surface Forces Apparatus, the thermal response of poly(N-isopropylacrylamide) (PNIPAM) brushes of various grafting densities, grown from plasma-activated mica by means of surface-initiated polymerization. We thus show that dense thermoresponsive brushes collapse gradually as temperature is increased, and that grafting density greatly affects their ability to swell: the swelling ratio of the brushes, which characterizes the thickness variation between the swollen and the collapsed state, is found to decrease from $\sim 7$ to $\sim 3$ as the number of grafted chains per unit area increases. Such a result, obtained with an unprecedent resolution in grafting density, provides qualitative support to calculations by Mendez {\it et al.} [{\it Macromolecules} {\bf 2005} {\it 38}, 174]. We further show that, in contrast to swelling, adhesion between two PNIPAM brushes appears to be rather insensitive to their molecular structure.
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