Viscoelastic behavior of polymerizing systems |
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Authors: | Raju B Mankar Deoki N Saraf Santosh K Gupta |
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Institution: | (1) Department of Chemical Engineering Indian Institute of Technology Kanpur, 208 016, India E-mail: dnsaraf@iitk.ac.in, IN |
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Abstract: | Experimental data of the dynamic viscoelastic properties, storage modulus (G′), loss modulus (G′′), and phase shift (δ) as well as of the viscosity, η, are reported for the polymerization of a free radical polymerization
system (methyl methacrylate) which exhibits the Trommsdorff effect. A rheometer-reactor assembly developed in our laboratory
is used for this purpose. It is observed that in the early stages of reaction, data lie in the terminal zone. As the polymerization
progresses, the Trommsdorff effect leads to a sharp increase in both the polymer concentration and the weight average molecular
weight, and the viscoelastic properties then lie in the entanglement zone. A modulus crossover point (when G′ = G′′) is identified that could be used as an identification of the point where the Trommsdorff effect starts assuming significance.
Received: 17 September 1998 Accepted: 9 December 1998 |
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Keywords: | Bulk polymerization Viscosity Dynamic viscoelastic properties State estimation Methyl methacrylate |
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