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Showing 1 to 19 of 19 for “"benzoyl peroxide"”.
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A study of structure-property relationships in certain polymeric dental materials
… polymer system, the effects of BisGMA/THFMA and benzoyl peroxide initiator were studied in greater depth. Mathematical models have been constructed which describe the effect of BisGMA/THFMA and benzoyl peroxide on the stiffness and viscoelasticity of the polymer. Consideration of these models and …
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The thermal degradation of polystyrene.
… explanations for the behaviour of thermally- and benzoyl peroxide-initiated polystyrenes. A significant degree of recombinations is shown to take place after chain scission. The volatilisation behaviours of a thermal polystyrene and low RMM benzoyl peroxide-initiated polymer are studied. The loss …
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Investigation of Acrylated Alkyds
… alkyds and acrylic monomers in the presence of benzoyl peroxide initiator. To elucidate the grafting sites, 2D gradient heteronuclear multiple quantum coherence Nuclear Magnetic Resonance (2D gHMQC NMR), 1H NMR, selective extraction, and gas chromatography were conducted to study each system. …
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Part One: Ozonolysis of Diphenylvinylene Carbonate. Synthesis and Thermolysis of Dibenzoyl Monoperoxycarbonate. Part Two: Singlet Oxygen: The Lifetime of Singlet Oxygen in Solution and Its Reaction With Ene-Type Olefins
… diphenylvinylene carbonate is found to give dibenzoyl monoperoxycarbonate in good yield. A mechanism for the formation of this peroxide is proposed and is consistent with the Criegee mechanism for ozonolysis of most olefins. The thermolysis of dibenzoyl monoperoxycarbonate in benzene is also …
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Single wall carbon nanotubes as viscosity modifiers in polypropylene matrix nanocomposites
… in the iPP250,000 matrix. In these systems, benzoyl peroxide was used as the free radical initiator which could facilitate the covalent bonding of single walled nanotubes to the polymer chains in the melt. Both non-functionalized and functionalized hybrid nanocomposites were evaluated for …
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Lignin acrylate derivatives and their behaviors in free radical copolymerizations
… in 1,2-dichloroethane: ethanol were initiated by benzoyl peroxide. The monomer reactivity ratios were investigated for these copolymerization combinations. The copolymer compositions were analyzed by UV for GIU-co-MMA and HPGIU-co-MMA, while methoxyl content determination by HI-GC was used to …
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Control of major histocompatibility Class I antigen expression in adenovirus transformed cells.
… cells by the use of the free radical producer benzoyl peroxide and other inducers such as tumour necrosis factor and cycloheximide. Benzoyl peroxide was shown to activate transcription and scavengers of free radicals prevented the induction. These results were incorporated into a model of …
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Synthesis of 2H-1-Benzthiocin: a Precursor for the Generation of the "4n+2" Pi-electron 1-Benzthiocinide Anion.
… with NBS in the presence of catalytic amount of benzoyl peroxide. However, from the complex reaction mixture, only the dibromo compound <strong>21</strong> was isolated and identified.</p>
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Touch-and-go chemistry: development of materials for and demonstration of a contact-initiated polymerization
… with N,N-dimethylaniline (DMA) and benzoyl peroxide (BPO) groups which co-initiate free radical polymerizations. The mechanism by which they co-initiate requires contact between the DMA and BPO molecules. When DMA and BPO were conjugated to complementary particles, a free radical …
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The use of silicone resins as corrosion protective coatings for magnesium alloys
… to be a more efficient curing accelerator than benzoyl peroxide when used in a concentration of 0.30% based on the solid resin content. Benzoyl peroxide was proved to be better than no curing accelerator at all. Polymerization tests of silicone resins 802 and 803, conducted in atmospheres of …
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Some Aspects of the Oxidative Stability of Cis-1, 4-Polyisoprene Vulcanizates
… generated from αα'-azodi-isobutyronitrile and benzoyl peroxide and also by the addition of cumene hydroperoxide. Additional data obtained from analysis of the hydroperoxide decomposition products served to define the action of the antioxidant more precisely. A comparison of the oxidative …
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Conformationally Immobile Calix[6]arenes as Negative Resists in Electron Beam Lithography
… involving the use of a radical initiator (benzoyl peroxide) were exposed for both conformers, and no significant change in pattern quality or sensitivity from nonintiator formulations was observed. The exposure characteristics of the conformationally immobile calix[6]arenes in the electron …
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Studies of the Evaluation of Solid Phase Dispersants in Polymer Blends
… onto processed LDPE, in which the preformed hydroperoxide acts as a free radical initiator for the graft copolymerisation. 2. By grafting of styrene into LDPE in the presence of free radical generators such as benzoyl peroxide (BPO) and cumene hydroperoxide (CHP). 3. By mechano-chemical synthesis, …
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Synthesis and Characterization of Multi-Component Polymeric Materials Prepared via Free Radical Polymerization
… = 1.10) were synthesized in bulk styrene using benzoyl peroxide in the presence of TEMPO at approximately 130 °C. In situ mid-infrared spectroscopy was successfully utilized to follow initiation, monomer conversion, and polymer formation. Real-time data allowed for the determination of apparent …
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Examination Of Methods To Reduce Membrane Fouling During Dairy Microfiltration And Ultrafiltration
… whey or MF permeate of skim milk with hydrogen peroxide (H2O2) or benzoyl peroxide (BPO) influenced UF flux, diafiltration flux, or membrane fouling during production of WPC80 or SPC80. Addition of annatto color to milk had no effect on flux or fouling. Bleaching with or without added color …
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Functionalisation of polymers: reactive processing, structure and performance characteristics
… reactive processing methods. Four different peroxides, benzoyl peroxide (BPO), dicumyl peroxide (DCP), 2,5-dimethyl-2,5-bis-(tert-butyl peroxy) hexane (t-101), and 1,1-di(tert-butylperoxy)-3,3,5-trimethyl cyclohexene (T-29B90) were examined as free radical initiators. An appropriate …
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Mechanochemical synthesis and evaluation of rubber-thermoplastic polymer blends
… The role of free-radical initiators such as benzoyl and dicumyl peroxide, on the behaviour of NR/PP(60/40) blends was investigated. It was shown that dicumyl peroxide was more effective than benzoyl peroxide in im proving mechanical properties of blends. Again no chemical reaction between …
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Effects of Surface Topography on Bacterial Biofilm Formation
… butyl acrylate (BA) as a linker, and 1 wt.% of benzoyl peroxide (BPO) as a thermal initiator. Among various combinations of molecular weight, 2:1 wt. ratio mixture of 15,000 g/mol PCLDIMA and 2,000 g/mol PCLDIMA showed a transition temperature of 36.7°C. The created rSMP has repeatable and …
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Modifications to the Suzuki reaction and mechanistic insights on the NBS mediated cleavage of benzylidene acetals /
… different acetals with N-bromosuccinimide and benzoyl peroxide in chlorobenzene at 70^C in all cases. Of the three mechanistic pathways discussed in the literature, it was determined, from the various reaction products obtained, that the fragmentation of the initial benzylic radical does not …