STABILIZATION AND MODIFICATION OF POLYCAPROAMIDE - Photochemical Reactions in Heterochain Polymers - page 38

proved at relative study of the effect of additives XLY and XLYII, similar according to their
structural features, but absorption of the additive XLYII takes place in the region with longer
wave with λ abs =460-560 nm.
As it is seen from Table 10 stabilizing activity of PCA-fibre dyed by the additive XLYII
is observed during long-wave irradiation, and at the same time this index is twice lower in a
sample dyed by the additive XLY.

Figure 1.15. Conservation of specific viscosity of dyed (I) and undyed (2) PCA-fibre at different wave-
length of irradiation and exposure time of 45 days.

Table 10. Viscosity characteristics of PCA-fibres

Number Source of

irradiation

Polymer
sample

Specific viscosity of irradiation % of

conservation
ή specific

Before
irradiation

After
irradiation

1. LDTs-80 PCA-initial 2,2 1,2 53,2

2. -//- PCA + XLYII 2,2 1,7 77,5

3 -//- PCA + XLY 2,2 0,7 39,4

1. PRK-2 PCA-initial 2,2 0,9 43,2

2. -//- PCA + XLYII 2,2 1,2 56,0

3 -//- PCA + XLY 2,2 2,0 94,3