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 26
... Efficiency of Energy Transfer The " efficiency of energy transfer " ( PET ) is given by ФЕТ = KET [ A ] KET [ A ] + KD ( 3.28 ) where kÈT is the rate constant for energy transfer ; kò is the rate constant for decay of the donor ; and ...
... Efficiency of Energy Transfer The " efficiency of energy transfer " ( PET ) is given by ФЕТ = KET [ A ] KET [ A ] + KD ( 3.28 ) where kÈT is the rate constant for energy transfer ; kò is the rate constant for decay of the donor ; and ...
Page 27
... efficiency ( PET ) is given by ФЕТ = IF ( A ) IF ( A + D ) ( 3.31 ) where IF ( A ) and IF ( A + D ) are the fluorescence intensities of the acceptor ( A ) in the absence and presence ... efficient if TD 3.6 Efficiency of Energy Transfer 27.
... efficiency ( PET ) is given by ФЕТ = IF ( A ) IF ( A + D ) ( 3.31 ) where IF ( A ) and IF ( A + D ) are the fluorescence intensities of the acceptor ( A ) in the absence and presence ... efficient if TD 3.6 Efficiency of Energy Transfer 27.
Page 88
... efficiency then the effective rate of polymer alkyl radical formation is · ri = 2 ki [ R ] . ( 4.131 ) In practice ... efficiency of initiator depends on : ( i ) an efficient population of the reactive excited singlet ( S1 ) and or ...
... efficiency then the effective rate of polymer alkyl radical formation is · ri = 2 ki [ R ] . ( 4.131 ) In practice ... efficiency of initiator depends on : ( i ) an efficient population of the reactive excited singlet ( S1 ) and or ...
Contents
Preface | 1 |
Electronically Excited States in Polymers | 9 |
Electronic Energy Transfer Processes in Polymers | 20 |
Copyright | |
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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 Allen NS amorphous and/or Appl Polym Sci aromatic bond carbonyl groups CH₂ Chem chemical chromophores chromophoric groups coefficient concentration crosslinking crystalline density depends diffusion dissociation donor and acceptor effect efficiency electron emission energy migration equation etching Europ Polym excimer excited donor excited singlet fluorescence formation formed free radicals free volume glass transition temperature hydroperoxide hydroxy impurities increases initial interaction intersystem crossing irradiation ketone kinetics lifetime Macromolecules main chain scission mechanism molecular weight molecule Norrish type occur oxidation photo-oxidative degradation photochemical photodegradation photoinitiator photolysis Phys plastics po/qo poly poly(methyl methacrylate poly(vinyl poly(vinyl chloride polyethylene polyimide Polym Degrad Stabil Polym Sci Chem polymer alkyl radical polymer chain polymer matrix polypropylene polystyrene POOH quantum yield quenching radiation absorbed rate constant reaction reactive recombination S₁ Sect singlet oxygen solid polymer solvent spin trap stress structure surface T₁ tensile thermal triplet viscosity wavelength