Thermal decomposition of 4,4?-azobis(4-cyanopentanol)

Effect of stannous octoate on the thermal decomposition of 2,2?-azobis(isobutyronitrile)

“…The shortest induction period is found for the ratio [SnOc 2 ]/[AIBN] = 1. Several authors 2,6,35 have reported similar observations when decomposing azo initiators and gave the following explanation: because the reactive medium was not initially saturated with nitrogen, the ®rst molecules of N 2 formed would dissolve in the solvent, and therefore could not be taken into account. (Table 2).…”

Preparation of Poly(N‐Vinylcaprolactam) (NVCL) and Statistical Copolymers of NVCL with Variable Cloud Point Temperature by Using A Trithiocarbonate RAFT Agent

“…2‐(Methacryloyloxy)benzoic acid (2MBA) was prepared according to a published procedure 20. 4,4′‐Azobis(4‐cyanovaleric acid) (ACVA, Fluka) was recrystallized from methanol and 4,4′‐azobis(4‐cyanopentanol) (ACP) was prepared according to the method described previously by Clouet et al21 4‐cyano‐4‐(dodecylsulfanylthiocarbonyl)sulfanyl pentanoic acid (CTA 1 ) was also prepared by a general procedure described previously 22. Acetone (Fermont), dichloromethane (Fermont), dimethylformamide (Fermont), 1,4‐dioxane (Spectrum), petroleum ether (Fermont), diethyl ether (Fermont), tetrahydrofuran (Spectrum), hexane (Fermont), methanol (Fermont), carbon disulfide,1‐dodecanethiol (Aldrich), sodium hydride (60% solution in mineral oil) (Aldrich), iodine (Fluka) and sodium thiosulfate (Fluka) were used as received.…”

Thermal decomposition of some azo initiators. Influence of chemical structure

“…He showed that the stability of the radical generated when nitrogen elimination occurs has an influence on the temperature at which azo decomposition may happen. Since the elimination of nitrogen from an azo compound is quantitative, several investigators 23,25,26,29,30) have used the volumetric technique to establish the overall rate of decomposition; a slight induction period in the reaction has been reported when this method is employed 23,25,26,29,30) . Other classical techniques are reported in the literature for measuring the rate for homolysis of azo type free radical initiators.…”

“…A number of methods 20,25) have been reported in the literature for determining reaction kinetics by DSC. The kinetic parameters determined using this technique are based on the heat (DH) of decomposition, assuming that azo decomposition of azo initiators studied occurs in the same way as that of AIBN 21,22) .…”