Mechanisms of Photophysical Processes and Photochemical Reactions in Polymers: Theory and ApplicationsDuring the last two decades, photophysical and photochemical processes have become increasingly important in many branches of polymer chemistry. Tremendous advances have been made in our understanding of the theory of photoreactions and they now have many practical applications in, for example, the synthesis of photoresists for microcircuitry, polymers for xerography, photocuring of paints and resins, photodegradation and photodestabilization of polymers. |
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Page 24
... quencher ( Q ) is given by Φο k1 [ D * ] la = KL KL + KD ( 1.45 ) The quantum yield for emission from an excited molecule ( D * ) in the presence of quencher ( Q ) is given by k1 [ D * ] = Φα - la KL k1 + kD + kQ [ Q ] ( 1.46 ) Dividing ...
... quencher ( Q ) is given by Φο k1 [ D * ] la = KL KL + KD ( 1.45 ) The quantum yield for emission from an excited molecule ( D * ) in the presence of quencher ( Q ) is given by k1 [ D * ] = Φα - la KL k1 + kD + kQ [ Q ] ( 1.46 ) Dividing ...
Page 26
... quencher during the lifetime of solution encounter , u = fraction of donor molecules which has at least one quencher molecule as a nearest neighbour . When a triplet energy transfer is actually controlled by diffusion the x = 1 . When ...
... quencher during the lifetime of solution encounter , u = fraction of donor molecules which has at least one quencher molecule as a nearest neighbour . When a triplet energy transfer is actually controlled by diffusion the x = 1 . When ...
Page 49
... quencher ( Q ) , ko bimolecular quenching rate constant , = t = fluorescence lifetime of the donor ( D ) in the absence of quencher ( Q ) , [ Q ] = concentration of the quencher . The plot of IF ( D / IF ( D + A ) Versus [ Q ] produces ...
... quencher ( Q ) , ko bimolecular quenching rate constant , = t = fluorescence lifetime of the donor ( D ) in the absence of quencher ( Q ) , [ Q ] = concentration of the quencher . The plot of IF ( D / IF ( D + A ) Versus [ Q ] produces ...
Contents
Preface | 1 |
Figs 16 1 16 2 16 8 16 | 3 |
Electronic energy transfer processes | 33 |
Copyright | |
9 other sections not shown
Common terms and phrases
absorbed absorption absorption spectrum acceptor acetate acid acrylate alkyl amines aromatic ketones benzene benzoin benzophenone carbonyl group CH₂ CH3 CH3 charge-transfer Chem chemical chromophore compounds concentration copolymers crosslinking CT complex degradation dissociation donor effect efficiency electron emission energy migration energy transfer ether excimer excimer formation exciplex excited singlet excited triplet exciton film fluorescence intensity formed hydrogen abstraction hydroperoxide interaction intersystem crossing intramolecular ketone ketyl ketyl radical kinetics lifetime low molecular Macromolecules mechanism methyl methacrylate molecule monomer occurs oxidation peroxide phenyl phosphorescence Photocrosslinkable Photodegradation photoinitiate polymerization photoinitiators photolysis photon photooxidation photopolymerization photoreduction photosensitizers photostabilizers pigments polar poly(methyl methacrylate poly(vinyl chloride polymer polymer chain polymer matrix polystyrene produced quantum yield quencher quenching R₁ R₂ radiation rate constant reactive S₁ salts Section sensitizer solution solvent spectra spectrum stabilizers structure styrene Table temperature tetrahydrofurane thermal triplet state T₁ u.v. irradiation Wavelength nm