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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... Kinetics of Photophysical Processes 2.7 Quenching Processes of Excited States 2.8 Quenching Processes in Solution . . 2.9 Quenching Processes in Polymer Matrices 3 Electronic Energy Transfer Processes in Polymers 3.1 Energy Transfer in ...
... Kinetics of Photophysical Processes 2.7 Quenching Processes of Excited States 2.8 Quenching Processes in Solution . . 2.9 Quenching Processes in Polymer Matrices 3 Electronic Energy Transfer Processes in Polymers 3.1 Energy Transfer in ...
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... Kinetics of Photodegradation 117 6.6 Number of Main Chain Scissions 119 Quantum Yield of Chain Scission 120 Quantum Yield of Crosslinking 121 6.9 Principles Governing the Changes in Molecular Weight and Molecular Weight Distribution ...
... Kinetics of Photodegradation 117 6.6 Number of Main Chain Scissions 119 Quantum Yield of Chain Scission 120 Quantum Yield of Crosslinking 121 6.9 Principles Governing the Changes in Molecular Weight and Molecular Weight Distribution ...
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... ( e.g. in studies of photolysis kinetics of photoinitiators ) where the value of the photolyte absorbance allows ex- pansion of Eq . ( 1.10 ) in series and 4 1 Absorption of Radiation Practical Aspects of the Lambert-Beer Equation.
... ( e.g. in studies of photolysis kinetics of photoinitiators ) where the value of the photolyte absorbance allows ex- pansion of Eq . ( 1.10 ) in series and 4 1 Absorption of Radiation Practical Aspects of the Lambert-Beer Equation.
Page 14
... Kinetics of Photophysical Processes Photophysical processes resulting from the absorption of photons by an iso- lated molecule in a polymer chain can be summarized as follows ( Fig . 2.1 ) : Step Excitation Rate So + hv → S1 Ia ( 2.14 ) ...
... Kinetics of Photophysical Processes Photophysical processes resulting from the absorption of photons by an iso- lated molecule in a polymer chain can be summarized as follows ( Fig . 2.1 ) : Step Excitation Rate So + hv → S1 Ia ( 2.14 ) ...
Page 15
... , then kp≫kт and Eq . ( 2.29 ) becomes OP OF = KISC = t kisc KF where TF is the lifetime of fluorescence . ( 2.30 ) 2.7 Quenching Processes of Excited States Excited singlet ( S1 2.6 Kinetics of Photophysical Processes 15.
... , then kp≫kт and Eq . ( 2.29 ) becomes OP OF = KISC = t kisc KF where TF is the lifetime of fluorescence . ( 2.30 ) 2.7 Quenching Processes of Excited States Excited singlet ( S1 2.6 Kinetics of Photophysical Processes 15.
Contents
1 | |
9 | |
PhotoOxidative Degradation | 17 |
Electronic Energy Transfer Processes in Polymers | 20 |
Energy Transfer Processes in Solution | 28 |
Photoinitiation of Polymer Degradation | 59 |
General Mechanism of Polymer PhotoOxidative Degradation | 67 |
Physical Factors Which Influence Photodegradation | 98 |
6 | 105 |
3 | 112 |
7 | 136 |
1 | 146 |
9 | 159 |
References | 193 |
Index | 209 |
5 | 99 |
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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 and/or bond carbonyl CH₂ chemical chromophores chromophoric groups concentration crosslinking crystalline diffusion dissociation donor and acceptor electron exchange energy electronic energy transfer energy migration energy transfer process equation etching exchange energy transfer excimer excited donor excited singlet fluence fluorescence formation free radicals free volume glass transition temperature hydrogen atom hydroperoxide hydroxy interaction intersystem crossing irradiation ketone lifetime Macromolecules McKellar JF mechanism molecular weight molecule Norrish type occur oxidation peroxide photochemical photodegradation Photodegradation of Polymers photoinitiator photolysis plastics poly(methyl methacrylate polyethylene polyimide Polym Degrad Stabil Polym Sci Chem polymer alkyl radical polymer chain polymer matrix polypropylene polystyrene POOH quantum yield quencher quenching radiation absorbed radiative energy transfer rate constant reaction reactive resonance-excitation S₁ sample Sect singlet oxygen solid polymer solvent spectrum stress surface T₁ temperature thermal triplet viscosity wavelength