Butyl-cumyl peroxide

Three peroxides with aromatic substituents have reported enthalpy of vaporization data, all from the same source". The enthalpies of vaporization of cumyl hydroperoxide and ferf-butyl cumyl peroxide are the same, which makes us skeptical of at least one of these values. The calculated b value for cumyl hydroperoxide is 31.5, consistent with the alkyl hydroperoxides. The calculated b value for tert-butyl cumyl peroxide is 15.4 and more than twice that for the mean of the dialkyl peroxides. The structurally related tert-butyl p-isopropylcumyl peroxide has a b value of 8.8 and so is consistent with the other disubstituted peroxides. 

The gas phase enthalpies of reaction 6 for the variously unsaturated peroxides are also consistent, with one exception. The values are ieri-butyl cumyl peroxide, —288.5 kJmol [l,4-phenylenebis(l-methylethylidene)]bis[(l,l-dimethylethyl) peroxide" (normalized for two peroxy groups), —287.1 kJmol 1,1-dimethylethyl-l-methyl-l-[4-(l-methylethyl)phenyl]ethyl peroxide, —276.6 kJmol and 2-tert-butylperoxy-2-methylhex-5-en-3-yne, —305.8 kJmor. The last species named also has a disparate liquid phase enthalpy of reaction, —344.9 kJ mol . The only solid phase reaction enthalpy, for [l,4-phenylenebis(l-methylethylidene)]bis[(l,l-dimethylethyl) peroxide (normalized for two peroxy groups), is —357.2 kJmol . 

Disproportionation reaction 7 might be expected to be thermoneutral in the gas phase and perhaps less so in the liquid phase where there is the possibility of hydrogen-bonding. Only for gas phase dimethyl peroxide is the prediction true, where the reaction enthalpy is —0.2 kJmoD. The liquid phase enthalpy of reaction is the incredible —61.5 kJmoD. Of course, we have expressed some doubt about the accuracy of the enthalpy of formation of methyl hydroperoxide. For teri-butyl cumyl peroxide, the prediction for thermoneutrality is in error by about 6 kJmor in the gas phase and by ca 9 kJmoD for the liquid. The enthalpy of reaction deviation from prediction increases slightly for tert-butyl peroxide — 14kJmol for the gas phase, which is virtually the same result as in the liquid phase, — 19kJmol . The reaction enthalpy is calculated to be far from neutrality for 2-fert-butylperoxy-2-methylhex-5-en-3-yne. The enthalpies of reaction are —86.1 kJmoD (g) and —91.5 kJmol (Iq). This same species showed discrepant behavior for reaction 6. Nevertheless, still assuming thermoneutrality for conversion of diethyl peroxide to ethyl hydroperoxide in reaction 7, the derived enthalpies of formation for ethyl hydroperoxide are —206 kJmoD (Iq) and —164 kJmoD (g). The liquid phase estimated value for ethyl hydroperoxide is much more reasonable than the experimentally determined value and is consistent with the other n-alkyl hydroperoxide values, either derived or accurately determined experimentally. 

Butter, peroxide value, 658, 660, 665 t-Butyl alcohol, tetroxide formation, 740 t-Butyl cumyl peroxide air pollutant, 622 determination, 707 hydroperoxide determination, 685 t-Butyl hydroperoxide (TBHP)... 

From the decomposition mechanism and the products formed it can be deduced that DCP primarily generates cumyloxy radicals, which further decompose into highly reactive methyl radicals and acetophenone, having a typical sweet smell. Similarly, tert-butyl cumyl peroxide (TBCP) forms large quantities of acetophenone, as this compound still half-resembles DCP. From the decomposition products of l-(2-6 rt-butylperoxyisopropyl)-3-isopropenyl benzene ( ), it can be deduced that the amount of aromatic alcohol and aromatic ketone are below the detection limit (<0.01 mol/mol decomposed peroxide) furthermore no traces of other decomposition products could be identified. This implies that most likely the initially formed aromatic decomposition products reacted with the substrate by the formation of adducts. In addition, unlike DCP, there is no possibility of TBIB (because of its chemical structure) forming acetophenone. As DTBT contains the same basic tert-butyl peroxide unit as TBIB, it may be anticipated that their primary decomposition products will be similar. This also explains why the decomposition products obtained from the multifunctional peroxides do not provide an unpleasant smell, unlike DCP [37, 38]. 

Tertiary butyl cumyl peroxide technically pure liquid... 

Aztec BCUP. See t-Butyl cumyl peroxide Aztec 1,1-BiS-50-AL, Aztec 1,1-BiS-50-WO. 

Luperox 801. See t-Butyl cumyl peroxide Luperox 802. See Di-(2-t-butylperoxyisopropyl) benzene Luperox ANS50. See Benzoyl peroxide Luperox DC/SC. See Dicumyl peroxide Luperox F. See Di-(2-t-butylperoxyisopropyl) benzene... 

Lupersol 801. See t-Butyl cumyl peroxide Lupersol Delta-3. See Methyl ethyl ketone peroxide... 

Perbunan NT/VC 2870 B Perbunan NT/VC 2870 Perbunan NT/VC 3470 B Perbunan NT/VC 3470 Perbunan NT/VC 4370 B. See Butadiene/acrylonitrile copolymer Perbutyl 355. See t-Butyl peroxy-3,5,5-tri methyl hexanoate Perbutyl A. See t-Butyl peracetate Perbutyl C. See t-Butyl cumyl peroxide Perbutyl D. See Di-t-butyl peroxide Perbutyl H. See t-Butyl hydroperoxide Perbutyl I. See t-Butyl peroxyisopropyl carbonate... 

Peroxide, 1,1-dimethylethyl-1 -methyl-1 -phenylethyl. Seet-Butyl cumyl peroxide Peroxide, di-t-pentyl-. See Di-t-amyl peroxide Peroxide, 1-hydroperoxycyclohexyl 1-hydroxycyclohexyl-. See Cyclohexanone peroxide... 

Trigonox SBP, Trigonox SBP-C50, Trigonox SBPS. See Di-s-butyl peroxydicarbonate Trigonox T, Trigonox T-94. Seet-Butyl cumyl peroxide... 

Acrylic/styrene/acrylonitrile terpolymer Allyl isocyanate Azelaic acid t-Butyl cumyl peroxide 4-t-Butyl-o-thiocresol Dimer acid, hydrogenated Dipentene-styrene resin t-Hexadecanethiol 1-Hexene n-Hexyl acrylate... 

Di methyl benzi I 3457-61-2 Aztec BCUP t-Butyl cumyl peroxide D-16 Liq. Peroxide... 

Acetaldehyde phenethyl propyl acetal t-Butyl cumyl peroxide CarvyI propionate Ethyl tricyclodecanecarboxylate Isobomyl acrylate Nopyl acetate C13H20O3... 

Dialkyl and diaralkyl peroxides (dicumyl peroxide, di-t-butyl peroxide, t-butyl cumyl peroxide, 2,5-dimethyl-2,5-bis(t-butylperoxy)hexane). 

Tertiary butyl cumyl peroxide technically pure liquid Special for SMC/BMC with deep flow at 130-160°C not sensitive to fillers pigments and promoters H... 

Tert.butyl-cumyl-peroxide (BCUP) Trigonox T Liquid 138 180 1.17X10 = 147.0... 

The ethylene-vinyl acetate rubbers have been available for some years (Levapren 450—Bayer) and contain about 45% vinyl acetate units. They are vulcanized by peroxides such as dicumyl peroxide, t-butyl cumyl peroxide, di-t-butyl peroxide and 2,5-bis(t-butyl peroxy)-2,5-dimethyl hexane. 

Crosslinking Aryl-AlkyIperoxides Tert.-Butyl cumyl peroxide Liquid, techn. pure... 

Low-cure temperature peroxides include benzoyl peroxide and 2,4-dichlorobenzoyl peroxide. At high-cure temperatures, di(f-butyl) peroxide is often used. The t-butyl cumyl peroxide, which substituted a methyl group of di(t-butyl) peroxide to a phenyl group, initiates cure at lower temperature than di(f-butyl) cumyl peroxide. Dicumyl peroxide, with substituted methyl groups on each side of di(t-butyl) peroxide to phenyl groups, initiates cure at lower temperature than di(f-butyl) cumyl peroxide. The general trend for cure initiation/ decomposition temperature is decreasing, i.e.,... 

For organic peroxide vulcanization, a variety of organic peroxides have been shown to be effective [7]. Such peroxides would include di-t-butyl peroxide dicumyl peroxide t-butyl cumyl peroxide l,l-di(t-butylperoxy)-3,3,5-trimeihyl cyclohexane 2,5-dimethyl-2,5-di(r-butylperoxy)hexane 2,5-dimethyl-2,5-di(r-butylper-oxy)hexyne-3 a,a-bis(t-butylperoxy)diisopropylbenzene t-butyl perbenzoate and t-butylperoxy isopropylcarbonate. In contrast to NBR elastomers where 1-3 phr of peroxide is effective, HNBRs generally require peroxide levels of 5-8 phr for effective vulcanization. As discussed earher, this is due to the very low levels of unsaturation present in the HNBR polymers. The specific peroxide chosen will depend on the process safety desired and the vulcanization temperature to be used. Generally, the most common organic peroxides used in HNBR elastomers are Dicumyl peroxide, such as Varox Dicup 40C from R.T. Vanderbilt, on an inert carrier for vulcanization below 177°C and a,a-bis(t-butylperoxy)diisopropylbenzene, such as Varox VC40KE from Vanderbilt, on an inert carrier for vulcanization above 150°C. 

Tert-butyl cumyl peroxide 1,1-Dimethyl benzene methanol Acetophenone Tertiary butanol... 

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