Polymer Derived Ceramics (PDCs) of Polyacrylonitrile/Oligosilazane Composite Nanofibers

摘要

Due to their exceptional properties, especially high thermal, chemical resistance and low density, advanced ceramics should occupy a major role in future materials and technologies. Nonetheless, essential industrial objectives involve the development of novel materials, with precise shape and micro-to-nanostructure.~1 Difficulties inherent to the traditional techniques for manufacturing these ceramics can be addressed by the preceramic polymers pyrolysis procedure.~2 This consists of the synthesis of a molecular precursor, its transformation into an inorganic polymer, shaping along a thermal treatment designed for conversion into the ceramic. Polymer-Derived Ceramics (PDCs) therefore present a growing interest in the ceramic science for the following major reasons: complex forms (fibers, porous ceramics, etcetera) can be achieved from the polymer, the ceramic micro-to-nanostructure is developed insitu during the polymer-to-ceramic conversion presenting infinite possibility to create new nanophase assemblage, metastable amorphous ceramics, as well as polycrystalline ceramic composites can be obtained.~3