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An ultraviolet method for the determination of the residence time distribution in a twin screw extruder

✍ Scribed by P. Cassagnau; C. Mijangos; A. Michel

Publisher
Society for Plastic Engineers
Year
1991
Tongue
English
Weight
504 KB
Volume
31
Category
Article
ISSN
0032-3888

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✦ Synopsis

Abstract

The stereoselective substitution of chlorine atoms was used to graft anthracene and phenyl groups onto the poly(vinyl chloride) (PVC) backbone as ultraviolet (UV) tracers for the assessment of the residence time distribution (R.T.D) of PVC chains during the extrusion of rigid and plasticized PVC. The residence time distribution obtained using these‐grafted tracers was compared with that obtained using a free UV tracer (anthracene). The polymeric tracer had a narrower R.T.D and a shorter mean residence time. This difference of behavior between a free and grafted tracers was attributed to the compatibility of these tracers with the PVC.

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