By Ramsay W., Donnan F.G.
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Additional info for A system of physical chemistry
The "most active wavelength region" for net chain scission of poly(ethylene terephthaiate) by polychromatic l i g h t i r r a d i a t i o n was determined by exposing a stack of thin films and analyzing i n t r i n s i c viscos i t y (a weight-averaged property) as a function of stack position (8). Both of these experimental approaches can y i e l d insight into the somewhat complex interplay of f i l m optical density, incident l i g h t intensity, and quantum yields as functions of wavelength.
After this treat ment no traces of antioxidants or other additives could be de tected by IR or UV. The sample contained ~ 1 ppm chromium both before and after the reprecipitation, however, as determined by atomic absorption ^spectrometry (8). 10 g/10 min. 07-10 . Compounding LDPE with TiO^ ajjd carbon black (CB) was per formed i n a Brabender Plastograph for 10 min at 90 rpm under nitrogen. The mixing chamber volume was 60 ml and the o i l bath temperature 160 C. The blending of 25 kg LDPE 3-5 times on a L u i g i Bandera SRL extruder.
Our results on this question demonstrated an almost identical pattern of changes i n both the hydroxyl-, carbonyl- and ether-absorption bands from 70 to 180 °C. Only the time necessary f o r a certain change differed. The composition of the carbonyl compounds contributing to the broad IR absorption band for severely oxidized samples have been investigated i n some d e t a i l by others (14, 15). In these studies, no e x p l i c i t information i s given concerning the composition as a function of the degree of degradation, however.