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It is seen from Table 18 that coefficient γ has different values depending on the extent of
PAC conjugation, being introduced into cellulose acetate. So, initial CA and CA with BA
additive after irradiation have the largest value of γ. Coefficients γ in CA with XXXV and
XXXVI additives after irradiation do not change considerably in comparison with the value
of initial CA. These results show that light resistance of CA stabilized samples essentially
depends on the extent of PAC conjugation.
Data of Figure 2.27 according to durability both initial and stabilized samples of CA-
films are the visual confirmation to information mentioned above. It is seen from Figure 2.27
that experimental data on durability of both initial and stabilized non-irradiated samples are
on the same line of dependence.
Figure 2.27. Effect of preliminary ultra-violet irradiation on CA durability. Additives in %: a - 1, b - 3.
o - non-irradiated CA, x - CA+BA irradiated, A -CA+XXXIV irradiated, A - CA+XXXV irradiated,
Q - CA+XXXVI irradiated, XXXVII - irradiated CA.
This fact means that introduction of light-stabilizer 1-3% of polymer mass into CA-film
does not practically effect on its initial strength till irradiation. Low-molecular additive BA in
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