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
... Triplet - Triplet Energy Transfer in Polymers 8888888 36 38 38 4 3.16 Energy Transfer from Carbonyl Groups to Hydroperoxides 3.17.
... Triplet - Triplet Energy Transfer in Polymers 8888888 36 38 38 4 3.16 Energy Transfer from Carbonyl Groups to Hydroperoxides 3.17.
Page 9
... triplet states . Higher excited triplets ( T2 , T3 ... T ; ) may be formed only when a molecule in its lowest triplet state ( T1 ) absorbs a new photon ( triplet - triplet absorption ) [ 491 ] . The energy of the first excited singlet ...
... triplet states . Higher excited triplets ( T2 , T3 ... T ; ) may be formed only when a molecule in its lowest triplet state ( T1 ) absorbs a new photon ( triplet - triplet absorption ) [ 491 ] . The energy of the first excited singlet ...
Page 10
... triplet absorption Phosphorescence кр кт Intersystem crossing So 2.2 Radiative Processes An electronically excited molecule can lose its excitation energy by emission of radiation , which is known as luminescence . There are two kinds ...
... triplet absorption Phosphorescence кр кт Intersystem crossing So 2.2 Radiative Processes An electronically excited molecule can lose its excitation energy by emission of radiation , which is known as luminescence . There are two kinds ...
Page 11
... triplet state will occur . Polymers containing aromatic carbonyl chromophores ( e.g. poly ( vinyl benzophenone ) have the lowest singlet state n - π * characterized by high in- tersystem crossing rates and short - lived triplets . 2.4 ...
... triplet state will occur . Polymers containing aromatic carbonyl chromophores ( e.g. poly ( vinyl benzophenone ) have the lowest singlet state n - π * characterized by high in- tersystem crossing rates and short - lived triplets . 2.4 ...
Page 12
... Triplet States - Hydrogen atom abstraction - Addition to unsaturated bonds - Radical rearrangements n -- π * States - - Atom abstraction - Radical addition - Electron abstraction or electron transfer Table 2.2 . Types of excited - state ...
... Triplet States - Hydrogen atom abstraction - Addition to unsaturated bonds - Radical rearrangements n -- π * States - - Atom abstraction - Radical addition - Electron abstraction or electron transfer Table 2.2 . Types of excited - state ...
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