what is the meaning of pulverization of rubber
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Answer:
The pulverisation of plastics gives advantageous properties as well as a uniform coloured powder. It has been found that the pulverised particles have a unique elongated and smooth shape attributed to the high shear conditions (Tatemichi and Tomizawa, 1997). The particles also display mechanical and physical properties comparable or better than the properties resulting from conventional processing of PCW (Schoeke et al., 1999).
Another process for plastic recycling is via solid-state shear pulverisation (S3P). In this process unsorted commingled PCW is subjected to high shear and pressure in the solid state. By rapidly removing frictional heat, the polymer mix is transformed to a uniform powder of controlled variable particle size suitable for processing by all conventional fabrication techniques (Nesarikar et al., 1997; Bilgili et al., 2001a, b). The process was developed by Northwestern University in the USA, after the basic principle of disintegration of plastics, called elastic strain-assisted grinding, was developed at the Academy of Science in Moscow, Russia.
For pulverisation to occur, the plastics are processed below their melting points, in the case of crystalline or semi crystalline polymers, or glass transition temperatures in the case of amorphous polymers. By controlling the temperature and process parameters, optimal fragmentation of the feedstock occurs, resulting in a powder production of a given size range. S3P is governed by mechanochemistry, where the use of mechanical energy causes a chemical reaction in the commingled polymers. When sufficient mechanical force is applied, chain scission occurs and macroradicals are formed, which then act as initiators for further reactions, i.e. the creation of block or graft copolymers as in situ compatibilising agents. Powder formation occurs due to the high shear and pressure that leads to fragmentation of the feedstock.
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