Peroxides dicumyl peroxide

Dicumyl Peroxide Synonyms Active Dicumyl Peroxide Bis(alpha,alpha-Dimethylbenzyl) - Peroxide Cumene Peroxide Cumyl Peroxide Dicumyl Peroxide Dicumyl Peroxide (DOT) Di-alpha-Cumyl Peroxide DI-CUP Diisopropylbenzene Peroxide Isopropylbenzene Peroxide CAS 80-43-3 Formula C18H22O2 Molecular Weight 270.40 Chemical Class Organic peroxide Melting Point 41 °C Flash Point] > 10 T. 

Aliphatic or aromatic peroxide curing agents can also be used, by reactions with vinyl side chains or even saturated alkyl groups. Specihc peroxides are chosen on the basis of their decomposition temperatures, and the reaction products they leave behind after the curing process is complete. Some peroxides used are Mv(2,4-dichloroben-zoybperoxide, benzoyl peroxide, dicumyl peroxide, and di-t-butyl peroxide.83-86... 

SYNS ACTIVE DICUMYLPEROXIDE BIS(a,a-DIMETHYLBENZYL)PEROXIDE CUMENE PEROXIDE CUMYL PEROXIDE DICUMYL PEROXIDE (DOT) DI-CUP DI-CUP 40 KF DI-CUPR DIISOPROPYLBENZENE PEROXIDE ISOPROPYLBENZENE PEROXIDE LUPERCO LUPEROX LUPEROX 500R LUPEROX SOOT VAROX DCP-R VAROX DCP-T... 

Interesting possibilities for the synthesis of new types of polysaccharide derivatives are offered by the reaction of addition to double bonds, which proceeds by a free-radical mechanism. The presence of initiators of free-radical polymerization (benzoyl peroxide, tert-butyl peroxide, dicumyl peroxide, dinitrile of azodiisobutyric acid), also irradiation with ultraviolet light, has effected the addition to 5,6-cellulosene of chloroform, carbon tetrachloride, methylmonochloroacetate, dimethyl-phosphite and other compounds that decompc under the conditions of a reaction with the formation of free radicals (45,46). The reaction proceeds as follows ... 

Among the most common free radical initiators are benzoyl peroxide, fert-butyl hydroxyperoxide, fert-butyl peroxide, dicumyl peroxide, 2,2 -azobisisobutyronitrile (AIBN), potassium persulfate, etc. 

Bis(1-methyl-1-phenylethyl) peroxide Dicumyl peroxide U18H22U2 80-43-3 270.367 cry (EtOH) 40 100 3 ... 

Modern GPPS is produced by continuous bulk and solution processes developed in the mid-1950s by major PS producers, BASF, Dow Chemical, Monsanto, Union Carbide, and others. In the modern continuous GPPS process, as the one shown in Figure 13.6, styrene monomer is continuously fed to a packed column (normally alumina, silica gel, or clay) to remove moisture, impurities, and inhibitor, blended with recycled styrene monomer, peroxide initiator (normally dialkyl or diacyl peroxides, such as di-fert-butyl peroxide, dicumyl peroxide, or fert-butyl peroxibenzoate utilized at low concentrations [I] <0.5% w/w in the feed), chain transfer agent (normally aliphatic... 

Dibutyl xanthogen disulfide p,p -Dichlorobenzoyl peroxide Dicumyl peroxide Diisopropyl xanthogen polysulfide N,N-Dimethylcyclohexylamine dibutyidithiocarbamate Dipentamethylene thiuram hexasulfide Diphenylguanidine Diphenylguanidine phthalate N,N -Diphenylthiourea 4,4 -Dithiodimorpholine Di-o-tolyl guanidine Ethylenediamine carbamate Hexahydro-1,3,5-triethyl-s-triazine 2-Mercaptobenzothiazole 2-Mercaptothiazoline... 

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

A high-performance PP/PLA alloy is successfully developed by reactive blending with the aid of EGMA and organic peroxide (dicumyl peroxide, DCP),... 

Cross-bnking agents Molecules that have two or more groups capable of reacting with the functional groups of polymer chains, where such a reaction connects or links the chains 2-Mercaptobenzothiazole, benzoyl peroxide, dicumyl peroxide, sulfur, toluene diisocyanate... 

Many organic peroxides can be employed, one of the more widely used ones being dicumyl peroxide. Dicumyl peroxide decomposes either thermally to yield free radicals or in acid media by an ionic cleavage mechanism without the production of free radicals. Since the free-radical mechanism is required for the polymer vulcanization reaction, the ionic cleavage decomposition has to be suppressed by the use of a non-acidic medium. The factor determines what type of filler can be used. 

The family of dialkyl peroxides includes dicumyl peroxide, which accounts for one-third of the volume of dialkyls world-wide and is the workhorse of this family of peroxides. Dicumyl peroxide is commonly used as a catalyst in polyester resin systans and for cross-linking polyethylene. Benzoyl peroxide is the most common of the diacyl peroxides. It is also used as a catalyst for curing polyester resins. Hydroperoxides are generally used as a raw material to produce other organic peroxides. The most common peroxides in this family include cumene hydroperoxide and t-butyl hydroperoxide. Ketone peroxides are mixtures of peroxides and hydroperoxides that are commonly used for room-temperature curing of polyester resins. Methyl ethyl ketone peroxide (MEKP) is the major product in this family. Peroxydicarbonates are largely used to initiate polymerization of polyvinyl chloride (PVC). 

Di(tert-butyl) peroxide Di(tert-amyl) peroxide Dicumyl peroxide... 

A rheometric study [159] was carried out by different tested poly(VDF-ter-HFP-ter-TFE) terpolymers cured by peroxides [dicumyl peroxide (40%) for P-1 l,3-bis(ferf-butylperoxisopropyl)-benzene (40%) for P-2 l,l-bis(ferf-butylperoxy)-3,3,5-trimethylcyclohexane (40%) for P-3 2,5-bis-(ferf-butyl-peroxy)-2,5-dimethylhexane (45%) for P-4 2,5-bis-(t-butylperoxy)-2,5-di-methylhexyne (45%) for P-5] with the same coagent (TAIC). Table 17 [159] gives the composition of the compounds used in the study. Compounds (FP-l to FP-5) differ only from the type and the amount of the peroxide. 

Peroxide treatment using organic peroxides such as benzoyl peroxide, dicumyl peroxide, or hydrogen peroxide has attracted attention in the treatment of natural... 

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. 

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