Carbonyl Identification and Quantification Uncertainties for Oxidative Polymer Degradation

Abstract Products from both the thermal and photooxidation of polybutadiene have been studied using various analytical techniques such as infrared and ultraviolet spectroscopy, gas—liquid chromatography, phosphorescence emission, and phosphorescence excitation spectroscopy. Analyses have allowed a plausible mechanism to be formulated for the photooxidation of this polymer, consistent with all the observed physical and chemical changes. Both photo- and thermal oxidative polymer degradation initially result in the formation of α,β-unsaturated carbonyls which, under photo-degrading conditions, are subsequently photolysed to yield the observed final products.

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Chapter 12 ESR and ESR Imaging Methods for the Study of Oxidative Polymer Degradation

Molecular Characterization and Analysis of Polymers - Comprehensive Analytical Chemistry ◽

10.1016/s0166-526x(08)00412-1 ◽

2008 ◽

pp. 499-524 ◽

Cited By ~ 3

Author(s):

Shulamith Schlick ◽

Krzysztof Kruczała

Keyword(s):

Polymer Degradation ◽

Imaging Methods ◽

Oxidative Polymer ◽

Esr Imaging

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Review for "Shedding light on human cerebral lipofuscin: An explorative study on identification and quantification"

10.1002/cne.24971/v2/review1 ◽

2020 ◽

Keyword(s):

Explorative Study ◽

Identification And Quantification

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Development of a Rapid Survey Method of Sampling and Analysis for Asbestos in Ambient Air

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100096400 ◽

1972 ◽

Vol 30 ◽

pp. 630-631 ◽

Cited By ~ 2

Author(s):

R. E. Heffelfinger ◽

C. W. Melton ◽

D. L. Kiefer ◽

W. M. Henry ◽

R. J. Thompson

Keyword(s):

Neutron Activation ◽

Ambient Air ◽

Survey Method ◽

Potential Hazard ◽

Transmission Microscopy ◽

Comparative Analyses ◽

Asbestos Fibers ◽

Controlled Conditions ◽

Unequivocal Identification ◽

Identification And Quantification

A methodology has been developed and demonstrated which is capable of determining total amounts of asbestos fibers and fibrils in air ranging from as low as fractional nanograms per cubic meter (ng/m3) of air to several micrograms/m3. The method involves the collection of samples on an absolute filter and provides an unequivocal identification and quantification of the total asbestos contents including fibrils in the collected samples.The developed method depends on the trituration under controlled conditions to reduce the fibers to fibrils, separation of the asbestos fibrils from other collected air particulates (beneficiation), and the use of transmission microscopy for identification and quantification. Its validity has been tested by comparative analyses by neutron activation techniques. It can supply the data needed to set emissions criteria and to serve as a basis for assessing the potential hazard for asbestos pollution to the populace.

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