By Niyazi, Savenkova
This quantity provides the research of contemporary achievements within the box of photodegradation of polymers. It contains, to start with, info of Russian investigators who've decisively contributed within the improvement of this box of data.
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Additional resources for Photodegradation and Light Stabilization of Heterochain Polymers
Sample text
From Fig. 33 it is seen that introduction of dyes increases thermal stability of PVA in the air, moreover it depends not only on the character of the found dye-polymer, but on chemical structure of the dye itself. So, the highest effect appears in phthalocyanine dyes, then follow azodyes and antrachinone dyes have the least effect. At the same time general tendency to improve stability to thermooxidative destruction for samples, containing covalently linked dyes, is displayed here. Curves of the loss of mass of dyed PVA samples at warming up in the air during an hour depending on temperature of warming up are given in Fig.
So, intrinsic viscosity of CA solution, not containing light-stabilizer, after 10 hours of irradiation decreases by 68,6%, but in films, containing XXXV, XXXI, XXXII, XXXVI, XXXVII – it decreases only by 13-15%. These PCA appeared to be the most effective light-stabilizers. Fig. 20 presents data, characterizing kinetics of specific viscosity conservation, and Fig. 21 present data on kinetics of CH3COOH accumulation in initial and stabilized CA – films at ultraviolet irradiation. As it is seen from these figures, intensive accumulation of acetic acid and decrease of specific viscosity is being observed in initial CA during the process of ultraviolet irradiation.
Intensive accumulation of carbonyl and aldehyde groups is observed in initial CA-film while slopes of strait lines of stabilized azomethine films (Fig. 26, curve 2-6) are much smaller and this shows decrease of the rate of these groups accumulation. It is interesting to note that in this case BA also facilitates the decrease of carbonyl and aldehyde groups accumulation, though oligomer XXXVII displays the greatest activity in this respect. Durability of polymer has been studied as the criterion of the effect of oligomer and polymer schiff’s base on the mechanical properties of CA-film in the process of ultra-violet irradiation.