Photodegradation of Polymers: Physical Characteristics and ApplicationsIn this book on physical characteristics and practical aspects of polymer photodegradation Rabek emphasizes the experimental work on the subject. The most important feature of the book is the physical interpretation of polymer degradation, e.g. mechanism of UV/light absorption, formation of excited states, energy transfer mechanism, kinetics, dependence on physical properties of macromolecules and polymer matrices, formation of mechanical defects, practics during environmental ageing. He includes also some aspects of polymer photodegradation in environmental and space condition. |
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Page 47
... dissociation of excimers to excited and non - excited chro- mophores occurs , ( b ) if the temperature is so high that dissociation and association are rapid compared to the deactivation process , an equilibrium between excimer and ...
... dissociation of excimers to excited and non - excited chro- mophores occurs , ( b ) if the temperature is so high that dissociation and association are rapid compared to the deactivation process , an equilibrium between excimer and ...
Page 52
... dissociation threshold . As soon as the energy is just a little higher than the level of the excitation valley , the molecule may dissociate , but the products will have very little excess energy and will be produced in thermal ...
... dissociation threshold . As soon as the energy is just a little higher than the level of the excitation valley , the molecule may dissociate , but the products will have very little excess energy and will be produced in thermal ...
Page 54
... dissociation processes are likely to occur from levels of that excited state . Energies required for the direct dissociation of different bonds in organic molecules are shown in Table 1.1 . 4.5 Quantum Yields of Photodegradation ...
... dissociation processes are likely to occur from levels of that excited state . Energies required for the direct dissociation of different bonds in organic molecules are shown in Table 1.1 . 4.5 Quantum Yields of Photodegradation ...
Contents
Preface | 1 |
Electronically Excited States in Polymers | 9 |
Electronic Energy Transfer Processes in Polymers | 20 |
Copyright | |
14 other sections not shown
Other editions - View all
Photodegradation of Polymers: Physical Characteristics and Applications Jan F. Rabek Limited preview - 2012 |
Photodegradation of Polymers: Physical Characteristics and Applications Jan F. Rabek No preview available - 2011 |
Common terms and phrases
ablation absorption absorption spectrum acceptor molecules Allen NS amorphous and/or Appl Polym Sci bonds carbonyl CH₂ chemical chromophores chromophoric groups coefficient concentration crosslinking decrease density depolymerization diffusion dissociation donor and acceptor efficiency emission energy migration energy transfer process equation etching Europ Polym excimer excited donor excited singlet fluence fluorescence formation free radicals free volume hydrogen hydroperoxide increases initial interaction intersystem crossing irradiation ketone kinetics laser radiation lifetime Macromolecules main chain scission McKellar JF mechanism molecular weight molecule monomer occur oxidation photochemical photodegradation Photodegradation of Polymers photoinitiator photolysis Phys plastics po/qo poly poly(methyl methacrylate polyethylene polyimide Polym Degrad Stabil Polym Sci Chem polymer alkyl radical polymer chain polymer matrix polymeric material polypropylene polystyrene POOH quantum yield quenching radiation absorbed radiative energy transfer rate constant reaction reactive S₁ sample singlet oxygen solvent spin trap stress surface T₁ temperature tensile thermal triplet viscosity wavelength