Imidization reaction parameters in inert molten polymers for micromixing tracer studies
✍ Scribed by John H. Frey; Costel D. Denson
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 481 KB
- Volume
- 43
- Category
- Article
- ISSN
- 0009-2509
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✦ Synopsis
A competitive-consecutive reaction involving a two-step imidization reaction in an inert molten polymer is proposed as a reaction tracer for studying micromixing in highly viscous liquids in polymer processing geometries.
In the proposed tracer system, phthalic anhydride reacts with p-phenylene diamine in molten polyethylene at dilute concentrations and elevated temperatures where the reactants and intermediates are soluble in the molten polymer.
Rate constants were measured using a reactive film procedure and are reported in this paper over a range of temperatures.
The rate constant for the first step was found to be an order-of-magnitude larger than the second step, and both steps were shown to be essentially irreversible. These conditions are used to show that the proposed reaction is mlxlng-sensitive and can be used to measure micromixing through measurements of selectivity.