Determination of branching in polyethylene and poly(vinyl chloride) using pyrolysis gas chromatography

Autor: David H. Ahlstrom, Shirley A. Liebman, Kent B. Abbås
Rok vydání: 1976
Předmět:
Zdroj: Journal of Polymer Science: Polymer Chemistry Edition. 14:2479-2495
ISSN: 1542-9369
0360-6376
DOI: 10.1002/pol.1976.170141014
Popis: A series of polyethylenes (PE), reduced poly(vinyl chlorides), and precursor poly(vinyl chloride) (PVC) systems were studied by pyrolysis–gas chromatography (PGC) and by pyrolysis–hydrogenation–gas chromatography (PHGC). The branch content of these polymers has been interpreted on the basis of previously established literature information. Low-density PE (LDPE) was found to contain a significant number of ethyl branches. The pyrolysis results on an LAH-reduced PVC series gave significant insight on PVC microstructure. It was determined that the short-chain branches in PVC are mainly one carbon long. Some ethyl side chains and virtually no butyl branches were found in this experimental PVC series. The effect of chain branching on the pyrolysis of PVC is to increase fragmentation. The benzene/toluene ratio, along with relative amounts of benzene and naphthalene formed, may be used to indicate the relative degree of branching in this system. The application of PGC and PHGC have thus been shown to successfully extend analytical work on PE and PVC and to provide microstructural information.
Databáze: OpenAIRE
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