On the mechanism of short‐branch formation in high‐pressure ethylene polymerization

Wickham, William T.

doi:10.1002/pol.1962.1206017012

J. Polym. Sci.

1962

DOI: 10.1002/pol.1962.1206017012

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On the mechanism of short‐branch formation in high‐pressure ethylene polymerization

William T. Wickham¹

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1964

1984

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Cited by 9 publications

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Studien zur Verzweigung von Kettenmolekülen. X. Untersuchungen zur Kurzkettenverzweigung des Hochdruckpolyethylens

1979

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Die Kurzkettenverzweigung von unter verschiedenen Bedingungen synthetisierten Hochdruckpolyethylenen wurde rnit Hilfe der y-Bestrahlung und nachfolgender gaschromatographischer Analyse der Spaltgase bestimmt. Es wurde experimentell belegt, daB Reaktionsdruck und Polymerisationstemperatur Art und Anzahl der Seitenzweige beeinflussen. Verzweigungsstruktur und Reaktionsparameter werden zueinander in Beziehung gesetzt und auf der Grundlage kinetischer Uberlegungen diskutiert.Ifayuenufi npoyeccoe paaeemsnenufi qennbcx aonetcya. X . Hccnedosanua tcopomtcoyennozo paaeemenenufi nonuamunena tmco~oeo daenenufi I I y T e M 0 6 n y s e~~x c y-nysam II Investigations on the branching of chain molecules. X . Investigations on short chain branchings of low density polyethyleneThe short chain branching in low density polyethylene obtained under various conditions were determined by y-irradiation followed by gaschromatography of the gaseous scission products. The pressure and temperature of polymerization were found to affect the kind and number of branchings. The branching structure and reaction parameters are related and discussed on a kinetic concept.

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Studien zur Verzweigung von Kettenmolekülen. X. Untersuchungen zur Kurzkettenverzweigung des Hochdruckpolyethylens

1979

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Hochdruck‐Polyäthylen

Luft

1979

Chemie Ingenieur Technik

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Low‐density polyethylene. The constantly changing economic situation requires periodic re‐assessment of the general direction of process and product development. This contribution surveys the present state of the art of high‐pressure polyethylene synthesis with due consideration of recent developments. Starting from chemical and chemical‐engineering fundamentals, the various polymerization processes and their products are compared and contrasted, and an attempt is made to predict further developments.

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Origin of the molecular structure and properties of low density polyethylene

Stoiljkovic

Jovanović

1984

Brit. Poly.J.

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It is generally accepted that the origin of the structural features of low density polyethylene (branching, unsaturation, molar mass and its distribution) can be explained by various isomerisation and decomposition reactions of the macroradicals and by various chain transfer processes. On the other hand, it is known that ethylene molecules under high pressure are organised in various supermolecular particles. There are several phases in compressed ethylene (a, 0 and y) depending on the pressure and temperature. The purpose of the present work was to determine the effects of the phase state of ethylene on the structure and properties of polyethylene. The authors have compiled published data about the effects of the synthesis pressure and temperature on the structure and properties of polyethylene. The entropy of ethylene under sythesis conditions for those published experiments was determined from the available information on pressure and temperature. The effects of ethylene entropy on the number and type of short chain branches, long chain branches, unsaturated bonds, molar mass and its distribution, chain flexibility, density and the melting point of polyethylene are demonstrated. It was found that under given ethylene entropy conditions, the same structure and properties of polyethylene are obtained.

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On the mechanism of short‐branch formation in high‐pressure ethylene polymerization

Cited by 9 publications

References 3 publications

Studien zur Verzweigung von Kettenmolekülen. X. Untersuchungen zur Kurzkettenverzweigung des Hochdruckpolyethylens

Studien zur Verzweigung von Kettenmolekülen. X. Untersuchungen zur Kurzkettenverzweigung des Hochdruckpolyethylens

Hochdruck‐Polyäthylen

Origin of the molecular structure and properties of low density polyethylene

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