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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... Equation 2 Electronically Excited States in Polymers • 2.1 Formation of Excited States 2.2 Radiative Processes 2.3 Radiationless Transitions 2.4 Excitation of Chromophores 2.5 2.6 Luminescence Emission from Chromophores Kinetics of ...
... Equation 2 Electronically Excited States in Polymers • 2.1 Formation of Excited States 2.2 Radiative Processes 2.3 Radiationless Transitions 2.4 Excitation of Chromophores 2.5 2.6 Luminescence Emission from Chromophores Kinetics of ...
Page 1
... equation E λ ( 1.1 ) where c is the speed of light ( 3 × 1017 nm s - 1 ) and & is the wavelength ( nm ) . Wavelength λ ( nm ) 100 Energy AE ( kcal / mol ) -28.6 280 315 400 ULTRAVIOLET UVC or FUV -102.1 UVB 90.8 UVA or NUV 71.5 VISIBLE ...
... equation E λ ( 1.1 ) where c is the speed of light ( 3 × 1017 nm s - 1 ) and & is the wavelength ( nm ) . Wavelength λ ( nm ) 100 Energy AE ( kcal / mol ) -28.6 280 315 400 ULTRAVIOLET UVC or FUV -102.1 UVB 90.8 UVA or NUV 71.5 VISIBLE ...
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... equation can easily be integrated when the concentration of absorbing molecules is independent of sample thickness ( 1 ) and radiation intensity ( I ) . Such a condition arises when the number of photons absorbed is only an ...
... equation can easily be integrated when the concentration of absorbing molecules is independent of sample thickness ( 1 ) and radiation intensity ( I ) . Such a condition arises when the number of photons absorbed is only an ...
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... equation shows that Sa is directly proportional to the extinction coefficient . 1.4 Practical Aspects of the Lambert - Beer Equation The " Lambert - Beer equation " is defined for a monochromatic ( 2 ) radiation as It -2.303ɛlM = 107 ...
... equation shows that Sa is directly proportional to the extinction coefficient . 1.4 Practical Aspects of the Lambert - Beer Equation The " Lambert - Beer equation " is defined for a monochromatic ( 2 ) radiation as It -2.303ɛlM = 107 ...
Page 5
... equation Ia = Io [ 1 − 10− ( A1 + A2 ) ] of which - ( 1.12 ) Ia ( 1 ) = Io [ 1 − 10− ( A1 + A2 ) ] . AI A1 + A2 ( 1.13 ) The validity of the Lambert - Beer equation is correct only for low con- centration of absorbing molecules and ...
... equation Ia = Io [ 1 − 10− ( A1 + A2 ) ] of which - ( 1.12 ) Ia ( 1 ) = Io [ 1 − 10− ( A1 + A2 ) ] . AI A1 + A2 ( 1.13 ) The validity of the Lambert - Beer equation is correct only for low con- centration of absorbing molecules and ...
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