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The enhancement of many of the mechanical properties of thermoplastics
which may be achieved by orienting the molecules has been known for some
time. It has been exploited in the production of textile fibres end
oriented films. Molecular orientation also occurs during processes such
as extrusion, moulding or forming. Here, unless carefully controlled, it
may well cause a deterioration in the properties of the finished article.
In view of this a systematic study on the anisotropy of the mechanical
properties of thermoplastics, resulting from molecular orientation, is
being carried out at present in these laboratories … [cont.]. |
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