| Summary: | 博士 === 國立交通大學 === 應用化學系所 === 95 === Abstract
In this study, we focus on three major subjects which based on non-fluorine low surface energy materials:
1. Thermal and Surface Properties of Phenolic Nanocomposites Containing Octaphenol Polyhedral Oligomeric Silsesquioxane
POSS (Polyhedral Oligomeric Silsesquioxane) molecule, which contains organic substituents on its outer surface that make the POSS nanostructure compatible with polymers, arouse much attention in recent years. We synthesized a new polyhedral oligomeric silsesquioxane (POSS) containing eight phenol functional groups and copolymerized it with phenol and formaldehyde to form a novolac type phenolic/POSS nanocomposites containing high thermal and low surface energy properties. The incorporation of POSS leads to the formation of a surface barrier that minimized the direct contact of the polar phenolic units with the air. The presence of such a barrier not only enhanced the thermal stability of the bulk and surface of these POSS-containing composites but also led to the surface energy being maintained after treatment at high temperature.
2. Effect of Intermolecular Hydrogen Bonding on Low-Surface-Energy Material of Poly(vinyl phenol)
We discovered that the poly(vinyl phenol) (PVPh) possesses extremely low surface energy (15.7 mJ/m2) after a simple thermal treatment procedure, even lower than the poly(tetrafluoroethylene) (PTFE) (22.0 mJ/m2) calculated based on the two-liquid geometric method. In addition, we also compared surface energies of PVPh-co-PS copolymers (random and block) and their corresponding blends, these random copolymers possess the lowest fraction of the intermolecular hydrogen bonding and surface energy than the corresponding block copolymers or blends after similar thermal treatment. This finding provides a unique and easy method to prepare a low-surface-energy material through simple thermal treatment procedure without using fluoro-polymers or silicones.
3. Reversible Wettability of a Polybenzoxazine-Silica Hybrid Surface between Superhydrophobicity and Hydrophilicity
Recently, reversibly controlling the surface wettability has aroused great interest and been demonstrated by various methods, however, multistep processes, stringent preparation specification, and the high cost of forming large-area environmentally responsive surfaces have heretofore limited their practical applications. Herein, we report on a simple two step process to create a roughness-enhanced solvent responsive wettability of a polybenzoxazine-silica hybrid surface. The silica nanoparticles modified with hydroxyl groups should be able to express hydrophilicity by responding to external stimuli. Reversible switching between superhydrophobicity and hydrophilicity can be achieved by repeatedly immersing the surface into selective solvents and drying it in vacuum.
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