Polymer composites sintered materials

Another polymer composite that is of interest is the more complex system SbCls-doped polyparaphenylene/polyparaphenylene sulphide (PPP/PPS) sintered materials (Rueda etal, 1988). 

Single-layer and combined films can be produced without heating by compaction or rolling of powder polymer compositions followed by sintering in an oven. Combined film materials are mainly formed by pressing with heating. Because of low productivity and imperfect quality of films produced this way compaction is infrequently used in industry [3]. 

Fine scaled composites can be prepared starting with molded and sintered ceramic arrays made by the soft mold process. Once the piezoceramic pillars have been formed, the remaining spaces are filled with a polymer matrix material. Next the base is removed by grinding. Metal electrodes are then bonded to the ends of the fibers and first used to polarize the piezoceramic at an elevated temperamre and then to apply an electric field or collect developed charges from the material. At this point, the active elements are ready to be used as piezoelectric transducer element. Experiments have shown that high-performance composites can be prepared . 

Diffuse or scattering samples can have many appearances or compositions. Materials such as ceramic tiles, packed powdered metal salts or polymers, painted chips, simple molded plastics, or more esoteric materials such as plasma-sprayed metals or sintered porous polymers, are all successfully used as standards for diffuse reflectance. 

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