Accession Number : AD0762480

Title :   Effects of Reaction Conditions on the Plasma Polymerization of Ethylene.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV BERKELEY DEPT OF CHEMICAL ENGINEERING

Personal Author(s) : Kobayashi,H. ; Shen,M. ; Bell,A. T.

Report Date : 15 JUN 1973

Pagination or Media Count : 31

Abstract : Ethylene can be polymerized at low pressures in a radio-frequency glow discharge. The form of the resulting polymer may be a powder at low pressure (1-2 torr) and low monomer feed rate (10-40 cc/min), a colorless film at low pressure and high feed rate (70-90 cc/min), or an oil at high pressure (4-5 torr) and high feed rate. The powder and film forms of plasma-polymerized ethylene are insoluble in common organic solvents, indicating a highly crosslinked structure. The oily products, however, are soluble in acetone and xylene. Chemical evidence indicates that the oil is most likely composed of highly branched oligomers of ethylene. Mass spectrometric analysis of the gaseous effluents show that under film-forming conditions the only hydrocarbon species observable are those derived from ethylene. The powder- and oil-forming conditions, on the other hand, yielded oligomeric species. On the basis of this evidence, a mechanism for the plasma-polymerization of ethylene is proposed. (Author)

Descriptors :   (*POLYMERIZATION, *ETHYLENES), (*GLOW DISCHARGES, POLYMERIZATION), RADIOFREQUENCY, LOW PRESSURE, FREE RADICALS, MASS SPECTRA

Subject Categories : Radiation and Nuclear Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE