Results 281 to 290 of about 8,287,589 (343)
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Thermal and thermal-oxidative degradation of polycyanates
Polymer Science U.S.S.R., 1974Abstract The thermal and thermal-oxidative degradaation of polycyanates based on 4,4′-dicyanatodiphenyl (PC-4) and 9,9-bis-(4-cyanatophenyl)fluorene (PC-9) have been investigated over a wide range of temperatures. The kinetics of decomposition of the polycyanates have been studied and the apparent energies of activation for the over-all process of ...
V.V. Korshak +5 more
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The thermal and thermal-oxidative degradation of chitin
Polymer Science U.S.S.R., 1980The kinetics of volatile products liberation (CO, CO2, H2O) during the degradation of crab chitin have been investigated in helium and oxygen atmospheres, but also the rate of the oxygen absorption in the 230–280°C range. The activation energies of the respective processes have been determined. The chitin is less heat-resistant than cellulose.
A.P Mar'in, Yu.A Shlyapnikov
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The thermal degradation of polystyrene
1977A review is made of the thermal degradation of polystyrene. In a theoretical study the importance of intramolecular transfer during degradation is emphasized in the formation of oligomeric volatiles. To account for past experimental results a mechanism is proposed involving biradical cage combination.
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Thermal and thermal oxidative degradation of polycarbamides
Polymer Science U.S.S.R., 1969DATA is given in t h e literature by many authors studying thermal degradation mechanisms of polymers obtained by polymerization and polycondensation [~, 2], but little information is available regarding the thermal and thermal oxidative degradation of polycarbamides.
O.Ya. Fedotova +2 more
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The thermal and thermal-oxidative degradation of polynaphthylimidophenylquinoxalines
Polymer Science U.S.S.R., 1979Abstract A study has been made of the relative importance of thermal (TD) and thermal-oxidative degradation (TOD) within a wide temperature range (300–600°C) on a number of polynaphthylimidophenylquinoxalines (PNTQ), containing diverse numbers of naphthylimide fragments to find out the optimal content of the latter.
V.V. Korshak +5 more
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Peculiarities of the Thermal Degradation of Chlorosulphonated Polyethylenes
International Journal of Polymeric Materials, 1990Abstract A kinetic study is made of the thermal degradation of chlorosulphonated polyethylenes containing 3–40 wt% of Cl and 1.4–2.2 wt% of sulphur. It is concluded that the instability of these polymers is principally due to activation of the CHCl structures in the β-position to the [sbnd]CH2[sbnd]SO2Cl groups.
K. S. Minsker +2 more
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Thermal Degradation of Sulforaphane in Aqueous Solution
Journal of Agricultural and Food Chemistry, 1999Sulforaphane, a cancer chemopreventive agent identified from broccoli, was degraded in an aqueous solution at 50 and 100 degrees C. The reaction mixtures were extracted with methylene chloride and analyzed by gas chromatography (GC) and gas chromatography/mass spectrometry (GC/MS).
Rosen, RT, Jin, Y, Wang, M, Ho, CT
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Beta-Carotene: Thermal Degradation
Science, 1964Thermal treatment of crystalline β-carotene (240°C in a vacuum) results in the formation of a volatile fraction containing chiefly aromatic hydrocarbons such as toluene, m - and p -xylene, 2,6-dimethylnaphthalene, and ionene.
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