Reference

Photochemical vulcanization of siloxane rubbers by aromatic azides

Photochemical vulcanization of siloxane rubbers by aromatic azides. Zueva, T. A.; Oleinik, A. V.; Treushnikov, V. M. (Gor'k. Gos. Univ., Gorkiy, USSR). Zh. Nauchn. Prikl. Fotogr. Kinematogr., 29(3), 180-3 (Russian) 1984. CODEN: ZNPFAG. ISSN: 0044-4561. DOCUMENT TYPE: Journal CA Section: 39 (Synthetic Elastomers and Natural Rubber) The photochem. vulcanization of SKTV-405, SKTFT-100, and SKTNF rubbers by arom. azides, e.g., 2,6-bis(4-azidobenzylidene)cyclohexanone (I) [20237-98-3], 4,4'-diazidobiphenyl (II) [2915-43-7], 4,4'-diazidodiphenylmethane (III) [2915-44-8], or a-naphthylazide (IV) [6921-40-0] was studied by EPR and spectrophotometry. The actual vulcanization mechanism depended on the azide:polymer molar ratio. The light sensitivity of silicon rubbers contg. I, II, III, and IV was detd.

Photochemical crosslinking of poly(phenylquinoxalines) with aromatic azides

Photochemical crosslinking of poly(phenylquinoxalines) with aromatic azides. Treushnikov, V. M.; Telepneva, T. V.; Oleinik, A. V.; Sorin, E. L.; Korshak, V. V.; Krongauz, E. S.; Belomoina, N. M. (Gor'k. Gos. Univ., Gorkiy, USSR). Vysokomol. Soedin., Ser. A, 28(10), 2129-34 (Russian) 1986. CODEN: VYSAAF. ISSN: 0507-5475. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Section cross-reference(s): 37 Study of the photochem. reactions of 4 poly(phenylquinoxalines) (I; Z = direct bond, O; Z1 = p-C6H4, p-C6H4OC6H4, naphthalenetetracarboxylic diimide radical) with 2,6-bis(4'-azidobenzal)cyclohexanone (II) [20237-98-3] showed that photochem. crosslinking for curing of I in layers occurred only in the case of I (Z = direct bond; Z1 = p-C6H4) [62996-61-6] and I (Z = O; Z1 = p-C6H4OC6H4) [37196-95-5] and in a relatively narrow range of O partial pressure (P) [1-3 Pa - (1-3) x 103 Pa].In this experiment, several chemicals are used like 20237-98-3 and 37196-95-5 At P < 1-3 Pa, nitrenes formed from the photolysis of II reacted with the polymers in a singlet state by a nonradical mechanism. No free radicals were formed for initiating crosslinking. At P > (1-3) x 103 Pa, mol. O had an inhibiting effect on the crosslinking. .