To enhance the properties of some polymers and give them a color, they use dispersion of pigments in polymer, which, if this dispersion happens well, can reduce the properties of the polymer. So it's very important to disperse well.
Co-extrusion: that is the process under the conditions of pressure and shear deformation - or in other words - mixing during the plastic flow.
This process is effectively used in modification of, for example chitosan
(read the papers of A.N. Zelenetskii, T.A. Akopova and their team)
Best Regards,
Leonid
Thank you for your answer
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