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Characterization of the Ground State Pyrene Complex in Ethylene-propylene Copolymer Solutions by Tze Chi Jao; Munmaya K. Mishra; Isaac D. Rubin; Jean Duhamel; Mitchell A. Winnik is a Materials Science article available to read on EtoBox.

What is Characterization of the Ground State Pyrene Complex in Ethylene-propylene Copolymer Solutions about?

## Abstract Pyrene‐labeled functionalized ethylene‐propylene (EP) copolymer was prepared by grafting 1‐pyrenebutyrylhydrazine onto EP copolymer through maleic anhydride pendants. The EP copolymer contained 60 mol % ethylene; its weight‐average molecular weight (__M__^w^) was 148,000. The pyrene‐labeled amide functionalized EP copolymer, PA‐EP(60/40), was made to simulate the amine functionalized EP copolymers that are commonly used as dispersant additives in motor oils. UV absorption spectra, fluorescence emission and excitation spectra, and fluorescence decay profiles of the pyrene were studied to determine the copolymer conformation and dynamics in methylcyclohexane and tetrahydrofuran (THF). The pyrene fluorescence characteristics of PA‐EP(60/40) were highly dependent on the solvent. The dependence of fluorescence emission intensity on the excitation wavelength was large in methylcyclohexane and moderate in THF. A frequency shift of about 2 nm was observed between the excitation spectrum obtained with the emission line at 377 nm and that at 550 nm in the methylcyclohexane solutions, but no shift was found in the corresponding tetrahydrofuran solutions. The ratios of the preexpon

Who reads Characterization of the Ground State Pyrene Complex in Ethylene-propylene Copolymer Solutions?

Author

Tze Chi Jao; Munmaya K. Mishra; Isaac D. Rubin; Jean Duhamel; Mitchell A. Winnik

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0887-6266)

Published

1995

Language

EN

Field

Materials Science (Physical Sciences)