EPR Application to Polymers. 2. Spin Probing of Poly(phenylacetylene)

James S. Hwang; Christos P. Tsonis

doi:10.1021/ma00239a006

EPR Application to Polymers. 2. Spin Probing of Poly(phenylacetylene)

James S. Hwang^*
, Christos P. Tsonis

^*Corresponding author for this work

King Fahd University of Petroleum & Minerals

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

Line shape changes in the electron paramagnetic spectrum of spin-probed poly(phenylacetylene) have been studied as a function of temperature. The line shapes have been simulated by using the stochastic Liouville theory of slow-motional effects on EPR spectra. Correlation times based on the moderate jump model have been calculated. It was found that the nitroxide spin probe exhibited anisotropic rotation whose anisotropy increased as temperature decreased. This has been interpreted as due to the intimate interaction between the nitroxide spin and the polymer chains which possess the ϕ-delocalized electrons. The activation energy calculated from the temperature of rapid reorientation of the nitroxyl radical gives E_a = 8 kcal mol^-1.

Original language	English
Pages (from-to)	736-739
Number of pages	4
Journal	Macromolecules
Volume	16
Issue number	5
DOIs	https://doi.org/10.1021/ma00239a006
State	Published - Sep 1983

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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10.1021/ma00239a006

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title = "EPR Application to Polymers. 2. Spin Probing of Poly(phenylacetylene)",

abstract = "Line shape changes in the electron paramagnetic spectrum of spin-probed poly(phenylacetylene) have been studied as a function of temperature. The line shapes have been simulated by using the stochastic Liouville theory of slow-motional effects on EPR spectra. Correlation times based on the moderate jump model have been calculated. It was found that the nitroxide spin probe exhibited anisotropic rotation whose anisotropy increased as temperature decreased. This has been interpreted as due to the intimate interaction between the nitroxide spin and the polymer chains which possess the ϕ-delocalized electrons. The activation energy calculated from the temperature of rapid reorientation of the nitroxyl radical gives Ea = 8 kcal mol-1.",

author = "Hwang, \{James S.\} and Tsonis, \{Christos P.\}",

year = "1983",

month = sep,

doi = "10.1021/ma00239a006",

language = "English",

volume = "16",

pages = "736--739",

journal = "Macromolecules",

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T1 - EPR Application to Polymers. 2. Spin Probing of Poly(phenylacetylene)

AU - Hwang, James S.

AU - Tsonis, Christos P.

PY - 1983/9

Y1 - 1983/9

N2 - Line shape changes in the electron paramagnetic spectrum of spin-probed poly(phenylacetylene) have been studied as a function of temperature. The line shapes have been simulated by using the stochastic Liouville theory of slow-motional effects on EPR spectra. Correlation times based on the moderate jump model have been calculated. It was found that the nitroxide spin probe exhibited anisotropic rotation whose anisotropy increased as temperature decreased. This has been interpreted as due to the intimate interaction between the nitroxide spin and the polymer chains which possess the ϕ-delocalized electrons. The activation energy calculated from the temperature of rapid reorientation of the nitroxyl radical gives Ea = 8 kcal mol-1.

AB - Line shape changes in the electron paramagnetic spectrum of spin-probed poly(phenylacetylene) have been studied as a function of temperature. The line shapes have been simulated by using the stochastic Liouville theory of slow-motional effects on EPR spectra. Correlation times based on the moderate jump model have been calculated. It was found that the nitroxide spin probe exhibited anisotropic rotation whose anisotropy increased as temperature decreased. This has been interpreted as due to the intimate interaction between the nitroxide spin and the polymer chains which possess the ϕ-delocalized electrons. The activation energy calculated from the temperature of rapid reorientation of the nitroxyl radical gives Ea = 8 kcal mol-1.

UR - https://www.scopus.com/pages/publications/33845550140

U2 - 10.1021/ma00239a006

DO - 10.1021/ma00239a006

M3 - Article

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EP - 739

JO - Macromolecules

JF - Macromolecules

IS - 5

ER -

EPR Application to Polymers. 2. Spin Probing of Poly(phenylacetylene)

Abstract

ASJC Scopus subject areas

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