Browse Prior Art Database

High-Temperature Teflon/Xydar Films

IP.com Disclosure Number: IPCOM000099618D
Original Publication Date: 1990-Feb-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 1 page(s) / 35K

Publishing Venue

IBM

Related People

Chu, MC: AUTHOR [+3]

Abstract

Disclosed are a high-temperature melt processable TELFON*/XYDAR** blend with TELFON in excess and a process for the fabrication of this blend in the form of a film. This blend represents a new breed of high strength polymers which, unlike conventional polymer/filler composites, self-reinforce without the use of non-polymeric fillers (e.g., glass fibers). This unique property can be attributed to the fibrous structure of the highly thermally stable XYDAR (an aromatic copolyester with a melt temperature of 421-435OC (*).

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High-Temperature Teflon/Xydar Films

       Disclosed are a high-temperature melt processable
TELFON*/XYDAR** blend with TELFON in excess and a process for the
fabrication of this blend in the form of a film. This blend
represents a new breed of high strength polymers which, unlike
conventional polymer/filler composites, self-reinforce without the
use of non-polymeric fillers (e.g., glass fibers).  This unique
property can be attributed to the fibrous structure of the highly
thermally stable XYDAR (an aromatic copolyester with a melt
temperature of 421-435OC (*).

      In order to form a uniform TELFON/XYDAR film, TEFLON and XYDAR
powders must be well mixed using, for instance, a pulverizer with the
aid of liquid nitrogen to break apart the powder aggregates.
Following mixing, the powdered sample must be dried by, for example,
heating under vacuum to minimize void formation caused by trapped
volatiles during film forming.  After drying, the film is cold formed
at room temperature in die under a pressure of 250 psi which should
be slowly applied to achieve maximum cold sintering. The preform is
finally heated in a vacuum bag to about 380oC with or without the
application of pressure.
*   Trademark of E. I. du Pont de Nemours & Co.
**  Trademark of Dartco Mfg., Inc.

      Reference (*) A. S. Wood, "Superforming Liquid Crystal
Polymers," Modern Plastics (April 1985).