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 66
... hydroxy ( HO ) radicals from the photocleavage of hydroperoxy ( POOH ) groups in polypropylene occurs with a 50 ... Hydroxy and / or Hydroperoxy Groups Hydroxy ( OH ) and hydroperoxy ( OOH ) groups are formed in reactions be- tween ...
... hydroxy ( HO ) radicals from the photocleavage of hydroperoxy ( POOH ) groups in polypropylene occurs with a 50 ... Hydroxy and / or Hydroperoxy Groups Hydroxy ( OH ) and hydroperoxy ( OOH ) groups are formed in reactions be- tween ...
Page 69
... neighbouring polymer molecule ( PH ) and abstract a hydrogen atom [ 452 ] : PH + HO . P. + H2O . ( 4.62 ) However , after a number of random displacements , hydroxy Reactions of Hydroxy (HO ) and Hydroperoxy (HO2) Radicals with Polymers.
... neighbouring polymer molecule ( PH ) and abstract a hydrogen atom [ 452 ] : PH + HO . P. + H2O . ( 4.62 ) However , after a number of random displacements , hydroxy Reactions of Hydroxy (HO ) and Hydroperoxy (HO2) Radicals with Polymers.
Page 70
... hydroxy ( HO · ) radicals may encounter each other , giving hydroxy peroxide ( H2O2 ) : HO + HO . H2O2 . ( 4.63 ) This cage effect is a function of the fluidity ( 1 / n ) 1 / 2 [ 103 ] , where n is the viscosity coefficient . Hydroxy ...
... hydroxy ( HO · ) radicals may encounter each other , giving hydroxy peroxide ( H2O2 ) : HO + HO . H2O2 . ( 4.63 ) This cage effect is a function of the fluidity ( 1 / n ) 1 / 2 [ 103 ] , where n is the viscosity coefficient . Hydroxy ...
Contents
Preface | 1 |
Electronically Excited States in Polymers | 9 |
Electronic Energy Transfer Processes in Polymers | 20 |
Copyright | |
17 other sections not shown
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