A Smart Surface:  Entropic Control of Composition at a Polymer/Water Interface

Surface segregation of fluorinated moieties on poly(methyl methacrylate-ran-2-perfluorooctylethyl methacrylate) films during film formation: Entropic or enthalpic influences

“…Accordingly, we have |TDS| > |DH| and the entropy factor would therefore dominate this system. This phenomenon was also observed by Carey and coworkers when investigating the abnormal surface reconstruction of surface-oxidized 1,2-polybutadiene by heating in water [65,66]. When the films were prepared by spin coating, the copolymer chains were believed to adopt an extended chain conformation due to the centrifugal force.…”

Formation and Properties of Responsive Siloxane‐Based Polymeric Surfaces with Tunable Surface Reconstruction Kinetics

“…Other researchers observed that reversibility disappeared after several switching cycles. [14,[25][26][27] In order to return the material to the original surface composition, another stimulus, such as temperature, had to be applied. [11] We postulated that, as barriers to rotation for the siloxane backbone are very low, the PVMS network would easily reorient in a new media to favor the lowest energy state.…”

“…[12] By varying substrate elasticity and composition of oxidized butadienes to create a system with a controlled rate of surface reconstruction, Ferguson and coworkers argued that surface reconstruction was dictated by shifts in enthalpic and entropic driving forces on the surface free energy. [13][14][15] Surface reconstruction is also associated with surface segregation of polymers and their reorientation at the surface. These two modes often act in accord and contribute simultaHere, the formation of responsive polymeric materials with tunable response time is reported.…”

A Polymer Composite Film with Reversible Responsive Behaviors

“…A stimuli-responsive surface, which can change its surface property depending on the change of external environment under different conditions, such as electromagnetic field, [1] temperature, [2][3][4][5] solvent, [6][7][8][9] light, [10][11][12][13] pH signal, [9,14] mechanical force [15] and so on, has aroused great interests of researchers. Recently, surface with reversible wettability [4][5][6][7]11,[13][14][15] has been extensively investigated because of its potential practical applications.…”

“…Recently, surface with reversible wettability [4][5][6][7]11,[13][14][15] has been extensively investigated because of its potential practical applications. Many materials, such as mixed polymer brush, [6][7][8][9] rubbers with functional groups, [2,3,16] polymers with lower critical solution temperature (LCST) behavior, [4,5,12] block copolymers, [17,18] some inorganic materials [10,11,13] and so on, have been used for fabricating surfaces with responsive wettability. In general, the major driving forces of polymer response are based on surface energy, entropy of the polymer chains, and variable specific segmental interactions.…”