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Fluorescence polarization studies of multicomponent polymer materials — anthracene labelled non-aqueous dispersions (1986)

Chiu, G. ; Winnik, M. A. ; Croucher, M. D.

Springer

Colloid & polymer science 264 (1986), S. 25-31

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ISSN: 1435-1536

Keywords: Polymerblends ; fluorescence decay ; polymer colloids ; energy migration

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract Fluorescence polarization measurements have been carried out in hydrocarbon solvents on non-aqueous colloidal polymer dispersions labelled with anthracene [A] groups. The polymer particles are composed (dry volume) of 9% polyisobutylene and 91% poly(methyl methacrylate) [PMMA]. The A groups were introduced during particle synthesis using 9-anthrylmethyl methacrylate as a comonomer with MMA. The extent of polarization decreases with increasing A content of the PMMA phase and increasing temperature increases the steady state fluorescence polarization. These results can be explained in terms of immobile A groups which are sufficiently close that some energy transfer [A*+A→A+A*] contributes to fluorescence depolarization.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01410305

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Consistent values of rate parameters in free radical polymerization systems. II. Outstanding dilemmas and recommendations (1992)

Buback, M. ; Gilbert, R. G. ; Russell, G. T. ; [et al.]

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 851-863

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ISSN: 0887-624X

Keywords: polymerization ; kinetics ; free radical ; transfer ; photolysis ; propagation ; rate coefficients ; termination ; EPR ; copolymerization ; initiation ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: The problems of determining reliable, well-characterized values of kinetic parameters in free-radical polymerizations are discussed. The origins of the fact that experimental determinations of rate coefficients of ostensibly identical systems often result in quite different values being reported can be ascribed to subtle mechanistic assumptions made in data interpretation, which are considered in detail. A series of recommendations to assist in overcoming these problems, and to highlight their origins, are presented, with emphasis placed on new techniques including those employing laser photolysis and EPR.

Additional Material: 5 Ill.