Retsos Haris, Gorodyska Ganna, Kiriy Anton, Stamm Manfred, Creton Costantino
Physico-Chimie des Polymères et des Milieux Dispersés, UMR 7615, Ecole Supérieure Physique et de Chimie Industrielles, 10, rue Vauquelin, 75231 Paris, France.
Langmuir. 2005 Aug 16;21(17):7722-5. doi: 10.1021/la050054s.
We investigated the adhesive properties of binary heterogeneous polymer brushes made from end-functionalized polystyrene (PS) and poly(2-vinylpyridine) (P2VP) chains. The molecular organization of the mixed brush could be varied reversibly by exposure to selective solvents for PS (toluene) and for P2VP (acidic water). This exposure results in reversible switching of adhesive and wetting properties. The manner in which the adhesion switching occurs can be tuned by the composition of mixed brushes. However, the outer surface composition could be enriched more effectively in PS after the toluene treatment than in P2VP after the acidic water treatment. As a result, the mixed brush compositions that showed the largest difference in properties between an exposure to toluene and an exposure to water were the P2VP-rich compositions. Adhesive properties, tested against a soft hydrophobic pressure-sensitive adhesive (PSA) using a probe test, always showed smaller differences between solvent treatments than wetting properties with water, suggesting a much higher sensitivity of the hydrophobic/hydrophilic brushes to polar molecules than to nonpolar molecules.
我们研究了由末端官能化聚苯乙烯（PS）和聚（2-乙烯基吡啶）（P2VP）链制成的二元异质聚合物刷的粘附性能。通过暴露于PS的选择性溶剂（甲苯）和P2VP的选择性溶剂（酸性水），混合刷的分子结构可以可逆地变化。这种暴露导致粘附和润湿性能的可逆切换。粘附切换发生的方式可以通过混合刷的组成来调节。然而，甲苯处理后PS在外表面的富集比酸性水处理后P2VP更有效。因此，在暴露于甲苯和暴露于水之间表现出最大性能差异的混合刷组合物是富含P2VP的组合物。使用探针测试针对软质疏水压敏粘合剂（PSA）测试的粘附性能，在溶剂处理之间始终显示出比用水润湿性能更小的差异，这表明疏水/亲水刷对极性分子的敏感性远高于对非极性分子的敏感性。
