Influence of screw elements on the processing of preparing LDPE-g-mah by reactive extrusion

Document Type

Conference Proceeding

Publication Date

9-28-2007

Abstract

The effects of screw configurations upon grafting of low density polyethylene with maleic anhydride initiated by dicymyl peroxide in a co-rotating twin screw extruder have been investigated. Grafting degree of the samples collected from three different positions on the screw and the exit of the die was evaluated by titration. The results showed that the screw configuration has a significant impact on the grafting process. The effects of the screw element structure upon reaction could be interpreted in two terms: conveying ability and mixing capability. Small conveying ability (i.e. large conveying resistance, such as in reversed kneading blocks) would lead to a high degree of fill in the screw channel, resulting in a long residence time and a high degree of reaction. Intensive mixing, especially elongational mixing (such as in the long lead elements), tends to enhance the ingredient uniformity in the reactive system, and facilitate the grafting process.

Identifier

34648846253 (Scopus)

ISBN

[1604232145, 9781604232141]

Publication Title

Annual Technical Conference ANTEC Conference Proceedings

First Page

364

Last Page

368

Volume

1

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