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 117
... initial depolymerization followed by complete unzipping , resulting in a relatively slow decrease in molecular weight with conversion ; ( iii ) line C corresponds to chain - end initiation followed by partial ( in- complete ) unzipping ...
... initial depolymerization followed by complete unzipping , resulting in a relatively slow decrease in molecular weight with conversion ; ( iii ) line C corresponds to chain - end initiation followed by partial ( in- complete ) unzipping ...
Page 118
... initial concentration of polymer chains [ 376 ] . Substituting Eq . ( 6.34 ) in Eq . ( 6.35 ) : S = $ 10εl [ c ] ot [ X ] o ( 6.36 ) For random chain scission kinetics as applied to small extents of degradation [ 361 , 376 ] , the ...
... initial concentration of polymer chains [ 376 ] . Substituting Eq . ( 6.34 ) in Eq . ( 6.35 ) : S = $ 10εl [ c ] ot [ X ] o ( 6.36 ) For random chain scission kinetics as applied to small extents of degradation [ 361 , 376 ] , the ...
Page 130
... initial rate of photo - oxidation ( rox ) can be obtained by differentiating the function n ( t ) and evaluating it at time t = 0 , in which case rox = xjk . ( 6.80 ) The values of x ; and k can be determined from the experimental photo ...
... initial rate of photo - oxidation ( rox ) can be obtained by differentiating the function n ( t ) and evaluating it at time t = 0 , in which case rox = xjk . ( 6.80 ) The values of x ; and k can be determined from the experimental photo ...
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