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 11
... benzophenone ) have the lowest singlet state n- * characterized by high in- tersystem crossing rates and short - lived triplets . 2.4 Excitation of Chromophores The term " chromophore " refers to the group mainly responsible for a given ...
... benzophenone ) have the lowest singlet state n- * characterized by high in- tersystem crossing rates and short - lived triplets . 2.4 Excitation of Chromophores The term " chromophore " refers to the group mainly responsible for a given ...
Page 38
... Benzophenone Poly ( vinylnaphthalene ) Benzophenone 588 20 3 × 109 64 26 282 15 1 × 109 167 Poly ( vinylmethylketone ) Benzophenone 8 109 170 is " forbidden " by the dipole - dipole interaction 38 3 Electronic Energy Transfer Processes ...
... Benzophenone Poly ( vinylnaphthalene ) Benzophenone 588 20 3 × 109 64 26 282 15 1 × 109 167 Poly ( vinylmethylketone ) Benzophenone 8 109 170 is " forbidden " by the dipole - dipole interaction 38 3 Electronic Energy Transfer Processes ...
Page 44
... benzophenone to benzophenone is indicated . Considering that F is the distance of net molecular energy migration , and Ro ( DD ) is the critical transfer distance for which the probability of energy transfer ( between D * and D ) equals ...
... benzophenone to benzophenone is indicated . Considering that F is the distance of net molecular energy migration , and Ro ( DD ) is the critical transfer distance for which the probability of energy transfer ( between D * and D ) equals ...
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