Reference

Aging- and electric breakdown-resistant polyethylene

Aging- and electric breakdown-resistant polyethylene. Onderka, Horst; Stephan, Ludwig; Patzelt, Joachim; Enge, Guenter; Schaar, Erich; Geyer, Wolfgang; Hofmann, Heinz; Boehm, Juergen (VEB Leuna-Werke "Walter Ulbricht", Ger. Dem. Rep.). Ger. (East) DD 203557 A1 26 Oct 1983, 8 pp. (German). (German Democratic Republic). CODEN: GEXXA8. CLASS: IC: C08L023-06. APPLICATION: DD 82-237150 3 Feb 1982. DOCUMENT TYPE: Patent CA Section: 37 (Plastics Manufacture and Processing) Highly pure polyethylene (I) [9002-88-4] (d. 0.915-0.930) contg. ethylene oxide-propylene oxide copolymer (II) [9003-11-6] and a compd. selected from an oligomeric 1,2-dihydro-2,2,4-trimethylquinoline polymer (III) [26780-96-1], N,N'-diphenyl-p-phenylenediamine [74-31-7], N,N'-di(2-naphthyl)-p-phenylenediamine [93-46-9], or 4,4'-thiobis(2-tert-butyl-5-methylphenol) [96-69-5] has good resistance to thermal aging and elec. breakdown and is useful as an insulator for medium- and high-voltage cables. Thus, I was mixed with 0.1% II and 0.1% oligomeric III. The mixt. retained 98% of its original break elongation after 7 h at 373K. The mixt. failed after 8 h in an elec. 96-69-5 and 9002-88-4 are just another two chemicals used in this study. breakdown test, compared with 6-7 h for I contg. only 1 of the additives. .

Effect of antioxidants on lipid peroxidation in iron-loaded rats

Effect of antioxidants on lipid peroxidation in iron-loaded rats. Dillard, Cora J.; Downey, Jeanne E.; Tappel, Al L. (Dep. Food Sci. Technol., Univ. California, Davis, CA 95616, USA). Lipids, 19(2), 127-33 (English) 1984. CODEN: LPDSAP. ISSN: 0024-4201. DOCUMENT TYPE: Journal CA Section: 18 (Animal Nutrition) As a measure of lipid peroxidn., pentane expired in the breath of rats loaded with an accumulated dose of either 100 mg or 186-200 mg of Fe injected i.p. as Fe dextran [9004-66-4] was measured over a 7-8 wk period, and the effect on pentane prodn. of feeding antioxidant-supplemented diets was detd. By the 7th week of feeding the diets, rats fed 0.3% L-ascorbic acid [50-81-7] produced 17% less pentane than did rats fed the basal antioxidant-deficient diet, whereas rats fed 0.004% dl-a-tocopherol acetate [52225-20-4] produced 92% less. After being fed the basal diet for 7 wk, Fe-loaded rats produced 76 pmol pentane/100 g body wt/min. When synthetic antioxidants were added to the diet at a concn. of 0.25%, the order of effectiveness in decreasing pentane prodn. after 1 wk was: N,N'-diphenyl-p-phenylenediamine [74-31-7] > ethoxyquin [91-53-2] > BHA [25013-16-5] > BHT [128-37-0] > propyl gallate [121-79-9] u no antioxidant. After removal of either ethoxyquin or N,N'-diphenyl-p-phenylenediamine from the diets for 1 wk, pentane prodn. increased to a high level. The total amt. of lipid-sol. 128-37-0 and 121-79-9 which are cas registry numbers of substances are two of reagents here. fluorophores in individual spleens of rats fed N,N'-diphenyl-p-phenylenediamine, ethoxyquin, dl-a-tocopherol acetate, ascorbic acid, and no antioxidant were correlated significantly with the corresponding total integrated amt. of pentane produced by the individual rats over the 7-8 wk period. This study has provided some of the most direct evidence to date that lipid peroxidn. is assocd. with Fe overload in vivo. .