Gross melt fracture elimination: the role of surface energy of boron nitride powders.(Abstract)

From: Polymer Engineering and Science | Date: April 1, 2002| Author: Seth, Manish; Hatzikiriakos, Savvas G.; Clere, Thomas M. | Copyright information

Boron nitride (BN) is an effective processing aid for the extrusion of polyethylenes. It postpones the onset of gross melt fracture to significantly high shear rates not previously attained with conventional fluoropolymers. However, BN particles containing relatively high amounts of boron oxide ([B.sub.2][O.sub.3]) do not perform well as processing aids. A reliable procedure has been developed for measurement of surface energy of powders using the capillary rise technique through the use of...

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