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. |
From inside the book
Results 1-5 of 20
Page 9
... ( fluorescence and phosphorescence ) . ( ii ) Radiationless processes . ( iii ) Bimolecular deactivation processes ( energy transfer processes ) . ( iv ) Dissociation processes , which occur when the absorption of a radiation ( photon ) ...
... ( fluorescence and phosphorescence ) . ( ii ) Radiationless processes . ( iii ) Bimolecular deactivation processes ( energy transfer processes ) . ( iv ) Dissociation processes , which occur when the absorption of a radiation ( photon ) ...
Page 10
... Fluorescence " is a spin - allowed radiative transition between states of the same multiplicity , usually taking place from the S1 level : S1 So + hvF . This emission has a short lifetime ( 10-9-10-5 s ) . ( 2.1 ) ( ii ) ...
... Fluorescence " is a spin - allowed radiative transition between states of the same multiplicity , usually taking place from the S1 level : S1 So + hvF . This emission has a short lifetime ( 10-9-10-5 s ) . ( 2.1 ) ( ii ) ...
Page 11
... fluorescence and is the most important route through which triplets are formed . The probabilities that these processes occur in an isolated molecule are de- pendent on the kind of electronic transition that takes place , i.e. whether ...
... fluorescence and is the most important route through which triplets are formed . The probabilities that these processes occur in an isolated molecule are de- pendent on the kind of electronic transition that takes place , i.e. whether ...
Page 13
... fluorescence and phosphorescence [ 29 , 30 ] . The initial fluorescence and phosphorescence in commercial polyolefines ( polyethylene and polypropylene ) is mainly due to the presence of a , ß unsaturated carbonyl chromophores resulting ...
... fluorescence and phosphorescence [ 29 , 30 ] . The initial fluorescence and phosphorescence in commercial polyolefines ( polyethylene and polypropylene ) is mainly due to the presence of a , ß unsaturated carbonyl chromophores resulting ...
Page 14
... Fluorescence spectroscopy offers little information about individual bond properties , but otherwise has some extremely favourable features [ 295 ] . ( i ) Fluorescence is the most sensitive optical spectroscopy . Useful signals can be ...
... Fluorescence spectroscopy offers little information about individual bond properties , but otherwise has some extremely favourable features [ 295 ] . ( i ) Fluorescence is the most sensitive optical spectroscopy . Useful signals can be ...
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 |
Other editions - View all
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