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 19
... molecule ( D * ) and a quencher molecule ( Q ) is unlikely through diffusion of the molecules . However , if the molecule D is the polymer matrix , D * and Q have the chance of an encounter if interaction of an excited molecule or group ...
... molecule ( D * ) and a quencher molecule ( Q ) is unlikely through diffusion of the molecules . However , if the molecule D is the polymer matrix , D * and Q have the chance of an encounter if interaction of an excited molecule or group ...
Page 31
... molecule is usually of the order 10-5 cm2 s − 1 , while in a viscous or solid medium , D can be of the order of 10 ... molecule ( D * ) to an acceptor molecule ( A ) occurs via a series of transfer initiated by energy transfer from D ...
... molecule is usually of the order 10-5 cm2 s − 1 , while in a viscous or solid medium , D can be of the order of 10 ... molecule ( D * ) to an acceptor molecule ( A ) occurs via a series of transfer initiated by energy transfer from D ...
Page 32
... molecule diffusing in fluid organic solvent , and D = 10-10 cm2 s ̄1 = 106 Å2 s1 , a value typical of very viscous , nearly rigid solvent ( e.g. polymer matrix ) [ 771 ] . Considering 1 ns as typical of the lifetime of a donor molecule ...
... molecule diffusing in fluid organic solvent , and D = 10-10 cm2 s ̄1 = 106 Å2 s1 , a value typical of very viscous , nearly rigid solvent ( e.g. polymer matrix ) [ 771 ] . Considering 1 ns as typical of the lifetime of a donor molecule ...
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 Allen NS amorphous and/or Appl Polym Sci aromatic bond carbonyl groups CH₂ Chem chemical chromophores chromophoric groups coefficient concentration crosslinking crystalline density depends diffusion dissociation donor and acceptor effect efficiency electron emission energy migration equation etching Europ Polym excimer excited donor excited singlet fluorescence formation formed free radicals free volume glass transition temperature hydroperoxide hydroxy impurities increases initial interaction intersystem crossing irradiation ketone kinetics lifetime Macromolecules main chain scission mechanism molecular weight molecule Norrish type occur oxidation photo-oxidative degradation photochemical photodegradation photoinitiator photolysis Phys plastics po/qo poly poly(methyl methacrylate poly(vinyl poly(vinyl chloride polyethylene polyimide Polym Degrad Stabil Polym Sci Chem polymer alkyl radical polymer chain polymer matrix polypropylene polystyrene POOH quantum yield quenching radiation absorbed rate constant reaction reactive recombination S₁ Sect singlet oxygen solid polymer solvent spin trap stress structure surface T₁ tensile thermal triplet viscosity wavelength