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 PET = KET [ A ] KET [ A ] + KD ( 3.28 ) where KET 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 PET = KET [ A ] KET [ A ] + KD ( 3.28 ) where KET 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 PET 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 of ... efficient if td 3.6 Efficiency of Energy Transfer 27.
... efficiency ( PET ) is given by PET 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 of ... efficient if td 3.6 Efficiency of Energy Transfer 27.
Page 88
... efficiency of initiator depends on : ( 4.132 ) ( 4.133 , 4.134 ) ( i ) an efficient population of the reactive excited singlet ( S1 ) and or triplet ( T1 ) states , which requires desirable absorptivity of photoinitiator , and a high ...
... efficiency of initiator depends on : ( 4.132 ) ( 4.133 , 4.134 ) ( i ) an efficient population of the reactive excited singlet ( S1 ) and or triplet ( T1 ) states , which requires desirable absorptivity of photoinitiator , and a high ...
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 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