Reference

NMR kinetic analysis of polyethylene-peroxide crosslinking reactions

NMR kinetic analysis of polyethylene-peroxide crosslinking reactions. McGinniss, V. D.; Nixon, J. R. (Columbus Lab., Battelle, Columbus, OH 43201, USA). Org. Coat. Appl. Polym.There are some reagents with their cas registry numbers 28009-68-9 and 9002-88-4 are used in this study. Sci. Proc., 48, 459-63 (English) 1983. CODEN: OCAPDE. ISSN: 0732-7528. DOCUMENT TYPE: Journal CA Section: 37 (Plastics Manufacture and Processing) The antioxidant-peroxide interaction in crosslinking polyethylene (I) [9002-88-4] was studied by changes in the stages of NMR lines. Tests were made with I contg. 2% 4,4'-methylenebis(2,6-di-tert-butylphenol) (II) [118-82-1] antioxidant, I contg. 4% isopropyl cumyl peroxide [28009-68-9], and I contg. 2% II and 4% peroxide. The I contg. only II showed no changes in NMR lines within 100 min, as opposed to peroxide-contg. I which showed large and rapid changes in NMR peak heights; the changes gradually diminished to O after ~45 min. The NMR peak height of I contg. both II and peroxide was between those of peroxide- and stabilizer-contg. I. The data suggest that crosslinking reactions are the major contributor to changes in NMR line shapes and the variations in the line shapes are related to structural changes in I. .

Transformation of Agidol 3 in synthetic rubber monomers

Transformation of Agidol 3 in synthetic rubber monomers. Pantukh, B. I.; Matveeva, Zh. A.; Shalimova, Z. S. (Sterlitamak. Opytno-Prom. Neftekhim. Zavod, Sterlitamak, USSR). Prom-st. Sint. Kauch., (10), 11-15 (Russian) 1983. CODEN: PSKAD6. DOCUMENT TYPE: Journal CA Section: 39 (Synthetic Elastomers and Natural Rubber) Section cross-reference(s): 25 The chem. transformations of Agidol 3 [2,6-di-tert-butyl-4-[(dimethylamino)methyl]phenol] (I) [88-27-7] in styrene (II) [100-42-5] and in 2-methyl-5-vinylpyridine (III) [140-76-1] were studied by gas-liq. chromatog. The oxidn. of I in II gave 2,6-di-tert-butyl-4-[(dimethylamino)methylene]-2,5-cyclohexadien-1-o ne (IV) [17329-93-0] and 2,6-di-tert-butyl-4-(3,5-di-tert-butyl-4-oxo-2,5-cyclohexadien-1-ylidene )-2,5-cyclohexadien-1-one [2455-14-3]. The oxidn. of I in III gave bis(3,5-di-tert-butyl-4-hydroxyphenyl)methane (V) [118-82-1], galvanophenol (VI) [4359-97-1], and traces of galvanoxyl radical (VII) [2370-18-5]. The oxidn. of I in 5-ethyl-2-methylpyridine [104-90-5] gave IV and V but no VI or VII. In aprotic solvents, I was oxidized to V and its oxidn. products.