By Farukh Fatekhovich Niyazi, Irina V. Savenkova, O. V. Burykina, G. E. Zaikov
Photochemical reactions are the most type of chemical approaches. those techniques offer for all times in the world, considering that because of photochemical techniques, vegetation soak up carbon oxide from the ambience altering them into the 'meal' for all creatures in the world. including 'good' photochemical tactics there are a few 'bad' in addition. This booklet is ready photodestruction and lightweight stabilisation and is dedicated to those tactics; for instance, the heterochain polymers. they're the most classification of large-tonnage polymers, that are used for manning a good number of polymer and composite fabrics (including nanocomposites).
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Additional info for Photochemical Reactions in Heterochain Polymers
Acetate fibres differ from cellulose fibres in light and thermooxidative stability, as the presence of ester groups decreases stability of molecular structure, owing to which destructive processes begin at much lower temperatures and weak energy effects. Since macromolecules of cellulose acetate are constructed on the basis of cellulose then mechanism of photodestruction of these polymers may be considered as general. Many summarizing works [141-147], published from 1962 to 2000, and are devoted to the questions of photochemistry.
And if there is possibility Stabilization and Modification of Cellulose Diacetate 55 for radicals to be lost and then irradiation is renewed, changing from lower intensity to higher one, then stationary concentration of radicals will increase proportionally to I0,5 and the rate of photolysis – proportionally to I1,5. Hence, the rate of photolysis is proportional to light intensity and concentration of radicals. These data show that acetic acid is formed at photolysis of radicals and in connection with this radical processes at CA photolysis have been studied.
It should be noted that in our experiments stationary mode is set up for 3-5 hours depending on the nature of irradiated samples. After the light source is turned off the process of oxidation gradually inhibits up to complete stoppage. However, repeated turn on of the light leads to setting stitionary mode up already in 0,5 hour, moreover this pause in irradiation may be rather long – a day or more. All this shows that photooxidation of impurities in PCA at the initial stage does not influence further course of the process of PCA oxidation.