Journal ArticleDOI
Pyrolysis-Molecular Weight Chromatography of Polymers: A New Technique
Erdogaan Kiran,John K. Gillham +1 more
TLDR
In this article, a pyrolyzer with programming capability was coupled with a thermal conductivity cell and a mass chromatograph for thermal degradation of low-density polyethylene.Abstract:
A pyrolyzer with programming capability has been coupled in series with a thermal conductivity cell and a mass chromatograph. The thermal conductivity cell gives the flexibility for selective trapping of decomposition products, and also provides data that are complementary to thermogravimetric and differential thermal analyses. The mass chromatograph is composed of two gas chromatographs that are run parallel from a common injection port. Each chromatograph uses a different carrier gas and is equipped with a gas density balance detector. The instrument simplifies identification of mixtures of unknowns in directly providing molecular weights, absolute quantities, and gas chromatographic retention times of the constituents. In this respect, the present system is analogous to pyrolysisgas chromatography-mass spectrometry. Discussion of the technique and its application to the investigation of the thermal degradation of low-density polyethylene are presented.read more
Citations
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Journal ArticleDOI
Gas density balance and the mass chromatograph
Erdogan Kiran,John K. Gillham +1 more
TL;DR: In this article, a theoretical development is presented to show the hydrodynamics of operation of the gas density balance (a gas chromatographic detector that is currently being used in the mass chromatograph).
Journal ArticleDOI
Thermoset and coatings technology: The challenge of interdisciplinary chemistry
TL;DR: In this article, the authors discuss the application of the torsional braid analyzer, a programmable pyrolyzer and thermal analysis to the study of coatings and thermosets in general.
Journal ArticleDOI
Empirical and molecular formula determination of polymer pyrolyzates by multi-referencing GC-MIP spectroscopy
TL;DR: In this paper, a multireferencing technique is described which utilizes pyrolysis products from known polymers to provide a reproducible reference range, and results are evaluated with relative errors.
Journal ArticleDOI
Pyrolysis‐molecular weight chromatography‐vapor phase infrared spectrophotometry: An on‐line system for analysis of polymers—a review
Erdoǧan Kiran,John K. Gillham +1 more
TL;DR: An instrumental system consisting of a combination of a programmable pyrolyzer, a thermal conductivity detector, a mass chromatograph, a gas chromatogram, a fast-scan vapor phase infrared spectrophotometer and a computer is reviewed in this article.
Journal ArticleDOI
Theory of thermal decomposition and volatilization of normal alkanes and linear polyethylene
TL;DR: In this article, an approach to the decomposition of normal alkanes without consideration of the volatilization was presented, based on the analysis of the fragments longer than C11 or than the respective pentamer random decomposition process for these polymers.
References
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Journal ArticleDOI
Gas–liquid chromatography: the gas-density meter, a new apparatus for the detection of vapours in flowing gas streams
A. J. P. Martin,A. T. James +1 more
TL;DR: The design of an instrument based on the same principle (the gas-density meter) compensated for the pressure difference 'due to flow by employing tubes arranged as a bridge circuit in which two points can be found, vertically displaced from one another, where thepressure difference is independent of the rate of flow of gas.
Journal ArticleDOI
The depolymerization of polymethylene and polyethylene
TL;DR: In this paper, the depolymerization rates and molecular weight changes of polymethylene have been studied and mass spectrometric analyses of the volatile products obtained. And the results are compared with those for commercial and radiation cross-linked polyethylene.
Journal ArticleDOI
Thermal decomposition products of polyethylene
Yoshio Tsuchiya,Kikuo Sumi +1 more
TL;DR: In this paper, a comprehensive analysis of the volatile thermal decomposition products of high-density polyethylene has been made with the latest techniques in gas chromatography, and the formation of products is explained on the basis of free-radical mechanism.
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Pyrolysis–molecular weight chromatography–vapor‐phase infrared spectrophotometry: A new on‐line system for analysis of polymers. I. Instrumentation
Erdoǧan Kiran,John K. Gillham +1 more