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Full Description
This monograph deals with the structural aspects of transport processes of gases, physical ageing and thermo-oxidative degradation of polymers in detail. Fractal analysis, cluster models of the polymer structureaEURO (TM)s amorphous state as well as irreversible aggregation models are used as main structural models. It is shown that the polymer structure is often a more important parameter than its chemical construction. Another significant aspect is the structural role in polymer melts oxidation. The basis for understanding of structural stabilisation gives anomalous diffusion of oxidant molecules on the fractal structure for both solid state polymers and polymeric melts. The important part of this problem is structure connectivity characterized by its spectral dimension. Therefore branched (cross-linked) polymers have smaller diffusivity in comparison with linear polymers.
Contents
IntroductionReferencesChapter 1. Structural modelsCluster model of polymeraEURO (TM)s amorphous state structureDescription of polymer structure within the framework of the fractal analysisMethods of fractal characteristics calculationPhysical sense of medium inhomogeneity in fractal kinetics of reactionsReferencesChapter 2. Fractal models of transport processes in polymer membranesThe main principles of gas transport processes fractal modelMultifractal models of gas transport processes in polymersThe fractal model of fluctuational free volume percolation and molecular mobilityThe features of gases diffusion in branched and cross-linked polymersThe structural model of the fast and clow gases diffusion in polymersReferencesChapter 3. Structural models of a polymers physical (thermal) agingReferencesChapter 4. Modification and stabilization of semicrystalline polymers by nonchain inhibitorThe structural changes caused by introduction of the highly-dispersed mixture Fe/FeOA description of HDPE+Z compositions structural stabilization within the framework of cluster modelFractal models of thermooxidative degradation inhibition for modified HDPEPhysico-chemical analysis of thermooxidative degradation mechanisms for modified polybutyleneterephthalateReferencesChapter 5. Fractal models of solid polymers thermooxidative degradationThe chemical aspect of structural stabilizationThe structural treatment of thermooxidative degradation of semicrystalline polymersFractal kinetics of polymers thermooxidative degradationSimulation of thermooxidative degradation with the help of Cayley treeReferencesChapter 6. Structural stabilization of polymer meltsA polymer melt structure role in thermooxidative degradation processThe scaling analysis of thermooxidative degradationA structural analysis of a thermooxidative degradation activation energyStructural treatments of oxidation kinetic curves initial partInterrelation of structure and chemical mechanisms of polymer melts oxidationStructural treatment of thermogravimetric analysis dataFractal models of polymers stabilization processesReferencesChapter 7. Structural aspects of type change of an oxidation kinetic curvesStructural criterion of a kinetic curves type changeSimulation of a polymer melts thermooxidative degradation within the framework of irreversible aggregation modelTheoretical description of sigmoid type oxidation kineticsThe interrelation of a kinetic curves type and an oxidation chemical reactionsReferencesChapter 8. Fractional differentiation and a polymers thermooxidative degradation processesApplication of fractional differentiation for polymer melt structure descriptionThe reacting system volume in a thermooxidative degradation processOxidation kinetics description within the framework of the Mittag-Leflere equationPrediction methods of kinetic curves and final parameters of polymers oxidationReferencesSubject IndexAbbreviations
