The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform
Božena Lanska - One of the best experts on this subject based on the ideXlab platform.
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chemiluminescence of polyamides ii luminescence accompanying Thermooxidation of lactam based polyamides related to the content of end groups of molecules
Polymer Degradation and Stability, 1999Co-Authors: Božena Lanska, L Matisovarychla, J Brozek, Jozef RychlýAbstract:The rate of the Thermooxidation of lactam-based polyamides, independent of oxygen pressure was measured. The intensity of chemiluminescence, changes in molecular weight and the content of end-groups in the polymer were followed. The oxidation rate, chemical changes of polymers and intensity of chemiluminescence in the course of oxidation were found to be dependent on the content of foreign groups in the polymer, on the structure and concentration of end-groups, and on the structures incorporated into the molecules by side reactions during polymerization. The relation between the intensity of chemiluminescence and the rate of oxidation consumption differed profoundly for various polyamides.
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Thermooxidation of lactam based polyamides with amino end groups Thermooxidation of hexano 6 lactam and decomposition of 6 hydroperoxyhexano 6 lactam in the presence of primary amines
Polymer Degradation and Stability, 1999Co-Authors: Božena Lanska, Danica Doskocilova, Lyda Matisovarychla, Rudolf Puffr, Josef RychlýAbstract:Oxygen consumption, reaction products and chemiluminescence in the course of the Thermooxidation of hexano-6-lactam melt in the presence of primary amines as well as Thermooxidation of lactam-based polyamides with amino end-groups were studied. Amines induce the homolysis of amide hydroperoxides, primary products of the chain oxidation of lactams, and react with aldehydes originating from hydroperoxide homolysis. By condensation of amines with aldehydes, aldimines are produced together with singlet oxygen, the initiator of N-alkylamide oxidation. In polylactams prepared by hydrolytic polymerization, the carboxylic and amino end-groups are associated and their effect on polymer Thermooxidation is thus suppressed.
Jozef Rychlý - One of the best experts on this subject based on the ideXlab platform.
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Thermooxidation stability of some degraded xyloglucans
IV INTERNATIONAL CONFERENCE TIMES OF POLYMERS (TOP) AND COMPOSITES, 2008Co-Authors: Lyda Matisovarychla, Katarina Csomorova, Jozef Rychlý, Anna Ebringerova, Anna MalovikovaAbstract:The effect on chemiluminescence intensity ant thus on thermal oxidation of the initial molar mass of xyloglucans has been examined. The molar mass was pre‐set by degradation using ultrasonic and/or gamma‐rays. It has been demonstrated that the initial molar mass has a significant effect on the course of xyloglucan oxidation.
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Study of the effect of 2,4,6‐trisubstituted phenols on the theromoxidative stability of polypropylene by the chemiluminescence method
Journal of Polymer Science: Polymer Symposia, 2007Co-Authors: L. Matisová-rychlá, P. Ambrovič, N. Kulíčková, Jozef Rychlý, J. HolčíkAbstract:The chemiluminescence method was used for the study of Thermooxidation of polypropylene. An attempt was made to interpret the time-reaction relationship of chemiluminescence. The influence of 2,4,6-trisubstituted phenols containing different substituents on the course of polypropylene Thermooxidation is also discussed.
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chemiluminescence of polyamides ii luminescence accompanying Thermooxidation of lactam based polyamides related to the content of end groups of molecules
Polymer Degradation and Stability, 1999Co-Authors: Božena Lanska, L Matisovarychla, J Brozek, Jozef RychlýAbstract:The rate of the Thermooxidation of lactam-based polyamides, independent of oxygen pressure was measured. The intensity of chemiluminescence, changes in molecular weight and the content of end-groups in the polymer were followed. The oxidation rate, chemical changes of polymers and intensity of chemiluminescence in the course of oxidation were found to be dependent on the content of foreign groups in the polymer, on the structure and concentration of end-groups, and on the structures incorporated into the molecules by side reactions during polymerization. The relation between the intensity of chemiluminescence and the rate of oxidation consumption differed profoundly for various polyamides.
Rene Arnaud - One of the best experts on this subject based on the ideXlab platform.
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hydroperoxidation in the low temperature Thermooxidation of linear low density polyethylene
Polymer, 1994Co-Authors: Elisabeth Fanton, Adams Tidjani, Rene ArnaudAbstract:Abstract Thermooxidation at 80°C of two types of low density polyethylene (ethylene-1-butene and ethylene-1-propene) was examined from i.r. spectroscopic measurements. The maximum concentration of isolated hydroperoxides was determined and compared with the initial content of vinyl and vinylidene unsaturations of the polymer films.
Josef Rychlý - One of the best experts on this subject based on the ideXlab platform.
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Thermooxidation of lactam based polyamides with amino end groups Thermooxidation of hexano 6 lactam and decomposition of 6 hydroperoxyhexano 6 lactam in the presence of primary amines
Polymer Degradation and Stability, 1999Co-Authors: Božena Lanska, Danica Doskocilova, Lyda Matisovarychla, Rudolf Puffr, Josef RychlýAbstract:Oxygen consumption, reaction products and chemiluminescence in the course of the Thermooxidation of hexano-6-lactam melt in the presence of primary amines as well as Thermooxidation of lactam-based polyamides with amino end-groups were studied. Amines induce the homolysis of amide hydroperoxides, primary products of the chain oxidation of lactams, and react with aldehydes originating from hydroperoxide homolysis. By condensation of amines with aldehydes, aldimines are produced together with singlet oxygen, the initiator of N-alkylamide oxidation. In polylactams prepared by hydrolytic polymerization, the carboxylic and amino end-groups are associated and their effect on polymer Thermooxidation is thus suppressed.
Peter Lehocký - One of the best experts on this subject based on the ideXlab platform.
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DSC study of stabilizing effect of antioxidant mixtures in styrene-butadiene rubber
Journal of Thermal Analysis and Calorimetry, 2012Co-Authors: Zuzana Cibulková, Andrea Černá, Peter Šimon, Ján Uhlár, Karol Kosár, Peter LehockýAbstract:The type of cooperation between antioxidants in the binary mixtures of four substituted diphenylamines and phenotiazine in the stabilization of styrene-butadiene rubber has been tested. Thermooxidation of the samples has been studied by differential scanning calorimetry under non-isothermal conditions. The protection factors of the individual stabilizers and their mixtures were determined. The synergy factors were applied to asses the type of cooperation of antioxidants in the mixtures. From their values it can be concluded that the type of cooperation depends on temperature. The highest synergistic effect has been observed for the mixture of phenotiazine and [4-(1-methyl-1-phenyl-ethyl)-phenyl]-phenylamine.
