The syntheses and studies of octaphenol polyhedral oligomeric silsesquioxane in polymer interactions and nanocomposite
|關鍵字:||多面體聚矽氧烷;酚醛樹酯;氫鍵;奈米複合材料;polyhedral oligomeric silsesquioxane;phenolic resin;hydrogen bond;nanocomposite|
(2) octa(acetoxystyryl)- octasilsesquioxane (AS-POSS)與酚醛樹酯混摻之高分子間作用力研究
Abstract Inorganic-organic hybrid materials combine both properties of inorganic and organic materials, and inorganic-organic hybrid nanocomposites have attracted enormous interests due to their large improvement of material properties. In numerous nanofillers, polyhedral oligomeric silsesquioxane(POSS) compounds have good dimension stability because they embody a truly hybrid (inorganic-organic) architecture, which contains an inner inorganic framework made up of silicone and oxygen (SiO1.5)x, that is externally covered by organic substituents. A selection of POSS nanostructured chemicals now exist that contain various combinations of nonreactive substituents and/or reactive functionalities. Thus, POSS nanostructured chemicals may be easily incorporated into common plastics via copolymerization, grafting, or blending to achieve well dispersion. In this thesis, we focus on three major subjects which based on octaphenol-polyhedral oligomeric silsesquioxane: (1) The syntheses of octaphenol-POSS The synthesis products are confirmed by FTIR and NMR. (2) Studies of hydrogen bonding in blends of phenolic resin with octa(acetoxystyryl)- octasilsesquioxane AS-POSS We concentrate on the polymer miscibility and specific interaction, especially in the hydrogen bonding interaction. The AS-POSS contains carbonyl group that is known as a proton acceptor for several polymers with proton doner, we can study the hydrogen bonding between phenolic and AS-POSS. (3) A novolac type of phenolic nanocomposite from octaphenol-POSS Phenolic resins are preferred in a wide range of applications, from commodity and construction materials to high technology aerospace industry. This recognition emerges from the fact that these resins have several desirable characteristics, such as superior mechanical strength, heat resistance and dimensional stability. In this studies, we incorporated octaphenol-POSS into phenolic matrix by copolymerization to attain further improvement of thermal properties.
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