Control of the Wetting Behavior of Thin Polymeric Films on Inorganic Substrates

这项研究考察了离聚体对无机基材上薄膜涂层去湿的影响。磺化和羧化聚苯乙烯和羧化聚硅氧烷离聚体将被合成并旋涂到硅片上。薄膜将在聚合物玻璃化转变温度以上的不同温度下进行热处理，并用X射线反射率、原子力显微镜和光学显微镜测量去湿动力学。聚合物薄膜和模型化合物与二氧化硅表面的相互作用将使用中红外和远红外反射-吸收光谱进行测量。聚合物的动态粘弹性将通过流变学测量来确定。聚合物涂层的稳定性对于各种技术至关重要，包括电子、生物材料、智能材料、粘合剂、摩擦学、光刻和高性能复合材料。这项研究调查了聚合物液体从固体基材上脱湿的热力学和动力学根源，所获得的信息可能使更薄的涂层以及具有定制表面化学的涂层的使用成为可能。这项研究还将培养聚合物化学和工程学以及表面和界面科学方面的本科生和研究生。

This research examines the effect of ionomers on the dewetting of thin film coatings on inorganic substrates. Sulfonated and carboxylated polystyrene and carboxylated polysiloxane ionomers will be synthesized and spin-coated onto silicon disks. The thin films will be annealed at various temperatures above the glass transition temperature of the polymer and the dewetting kinetics will be measured by x-ray reflectivity, atomic force microscopy and optical microscopy. The interactions of the polymer films and model compounds with a silica surface will be measured using mid- and far-infrared reflectance-absorption spectroscopy. The dynamic viscoelastic properties of the polymers will be determined by rheology measurements. %%%The stability of polymeric coatings is critical for a wide variety of technologies, including electronics, biomaterials, smart materials, adhesives, tribology, lithography, and high performance composites. This research investigates the thermodynamic and dynamic origins of dewetting of polymer liquids from solid substrates and the information obtained may enable the use of thinner coatings, as well as coatings with tailored surface chemistry. The research will also train undergraduate and graduate students in polymer chemistry and engineering and surface and interfacial science.***