Role of Diblock Copolymers toward Controlling the Glass Transition of Thin Polymer Films
作者： Hyunjoon Oh , Peter F. Green
DOI: 10.1021/MA071805V
关键词: Chemical engineering 、 Polymer chemistry 、 Polymer 、 Materials science 、 Oxide 、 Micelle 、 Glass transition 、 Critical micelle concentration 、 Thin film 、 Polymer blend 、 Copolymer 、 Inorganic chemistry 、 Organic chemistry 、 Materials Chemistry 、 Polymers and Plastics
摘要: The physical properties of thin polymer films are often thickness, h, dependent, influenced by confinement and interfacial interactions between the chains external interfaces. We show that magnitude film thickness dependence average glass transition temperature, Tg, polystyrene−silicon oxide (PS/SiOx/Si) system appreciably with addition polystyrene-b-poly(methyl methacrylate) (PS-b-PMMA) diblock copolymers. Tg can be “tailored” to increase, or decrease, decreasing h remain independent h. shifts as much 35 °C obtained for ≈ 20 nm. Additionally, we report critical micelle concentration, φcmc, copolymer in is considerably larger than bulk; specifically, micelles form only beyond a determined size number system. not ϕcmc this
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