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Solution Spinning and Drawing

A remarkable development in polymer science was the observation by A. J. Pen-nings that, when dilute solutions of polyethylene were cooled under conditions of continuous stirring, very fine fibres were precipitated on the stirrer. These fibres possessed a remarkable morphology consisting of a fine central core of extended chain polyethylene with an outer sheath of folded chain polymer material, so that electron microscopy revealed a beautiful shish-kebab structure. The possible significance of this result was recognised by Frank who emphasised the importance of extensional [Pg.5]

The next major development takes up the idea of the gel layer, and combines this with the tensile drawing of fibres at high temperature, hopefully to give a preparation route which is more acceptable in terms of production rates. We therefore now have a two stage process, in which a fibre of suitable initial structure is first produced, followed by a hot stretching process, and historically two parallel accounts have been given more or less contemporaneously. Smith and Lemstra describe the [Pg.6]

Pennings and his collaborators have examined the hot drawing behaviour of the range of spun fibres. The fibres were stretched between moving rollers, and the draw ratio determined as the ratio of the take-up speed on the second roller to the [Pg.7]

Some further studies of the gel spinning and drawing process have been undertaken by Manley and co-workers In polyethylene, their efforts were concentrated [Pg.8]

In a further development Peguy and Manley report the drawii of polypropylene gel films. The key result is summarised in Fig. 4, which shows the modulus/draw ratio [Pg.8]

2 Solution and Melt Processes 2.1 Solution Spinning and Drawing [Pg.5]


See other pages where Solution Spinning and Drawing is mentioned: [Pg.5]    [Pg.259]   


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