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Polypropylene degradation control during reactive extrusion

✍ Scribed by Sheng-Hong Pong; Chuan-Pin Lu; Ming-Chih Wang; Shih-Hsuan Chiu

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
175 KB
Volume
95
Category
Article
ISSN
0021-8995

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✦ Synopsis

Abstract

In this work, a proportional‐integral‐derivative (PID) control scheme with two different tuning methods to control the degree of degradation of polypropylene (PP) during reactive extrusion is proposed. The concentration of dicumyl peroxide is taken as the manipulated variable. The molten viscosity of PP under processing is taken as the controlled variable. The degree of degradation is determined by a viscosity function derived by an off‐line identification. A first‐order‐plus‐time‐delay empirical model is identified to simulate the system plant. Both Ziegler–Nichols tuned PID and internal model control (IMC)‐based PID controllers are implemented on the system. Better performances in settling time and precision can be achieved using the IMC‐based PID controller. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 95: 280–289, 2005

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