Document Type


Date of Award


Degree Name

Master of Science in Chemical Engineering - (M.S.)


Chemical Engineering and Chemistry

First Advisor

Werner J. Wenisch

Second Advisor

Richard Clyde Parker

Third Advisor

David S. Kristol


The incentives for Dry-Blending Polyethylenes of varying property type may be economic gain, improved product quality, or both. The manufacturers' latest mode of operation involves seeking to meet their customers' needs with a product line made by using one catalyst system and operating at maximum capacity, while varying the fewest possible control parameters. Off-spec materials and on-spec materials not fitting customers' requirements are two prime targets for additional profits with proper dry blending techniques. The approach used in solving the problem involved starting with an existing product line and converting these products into a number of experimental blends. The blends were to be fully tested for both rheological and physical properties after injection molding test specimens. Each final product property could then be correlated with the original properties of the materials used for each blend, yielding a statistically significant regression equation for that property. This could be used for predicting levels of that property for future blends. With these equations in hand, the manufacturer could dry-blend to meet with customer specs or for depletion of off-specification materials as he chooses.



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