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1 N NaOH solution for 1 hour with subsequent washing in distilled water. The thermomodification of films was carried out by heating at 120°C. The swelling of film specimens was determined by the gravimetric method. The principal possibility of ChT biodegradation process under the influence of the enzymatic complex ―Collagenase KK‖ has been established earlier [3]. In addition to ascertaining the destruction fact itself it has been found out that the conformational and supermolecular state of ChT in the film and correspondingly the rate and degree of ChT biodegradation are greatly determined by its aminogroups protoning degree which in its turn depends on the concentration of the acid used.

This task is solved by several constructive peculiarities of forming head. Extrusion head used for granulating reduced to fragments secondary polymers is comprised of a body with a feeding channel for feeding reduced to fragments materials, a pressing flange and a draw plate with a forming channel of variable length and a prominent profile of cross section of draw plate directing to the side of a feeding channel and is being made in the central part as an ellipsoid. 35 and has its maximum in the centre of a draw plate.

In case the substances are soluble in polymer but insoluble in the experimental medium migration is not taking place; (b) moisture stability of polymer and additives. In case of low moisture stability of polymer even the moisture-stable additives can be washed out from material on attainment of maximum water absorption. g. 04%. All antioxidants tested by us are insoluble in water, but they are distributed in PE melt perfectly (the classical feature required of any antioxidant [7]). Furthermore, according to the notion of diffusion, in cross-linked structures such processes are hampered.

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