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Telechelic Aryl Cyanate Ester Siloxanes as Low Flammability Impact Modifiers for Cyanate Ester Resins.


pdf icon Telechelic Aryl Cyanate Ester Siloxanes as Low Flammability Impact Modifiers for Cyanate Ester Resins. (273 K)
Pollack, S. K.; Bullen, Y.; Fu, Z.

NISTIR 6242; October 1998.

National Institute of Standards and Technology. Annual Conference on Fire Research: Book of Abstracts. November 2-5, 1998, Gaithersburg, MD, Beall, K. A., Editor(s), 45-46 pp, 1998.

Sponsor:

National Institute of Standards and Technology, Gaithersburg, MD

Available from:

National Technical Information Service
Order number: PB99-102519

Keywords:

fire research; fire science; fire suppression; resins; esters; thermal stability; polymerization

Abstract:

Cyanate ester resins (CERs) have found extensive use in applications where low-dielectric, high thermal stability materials are needed. Polymerization occurs by the cyclotrimerization of aryl cyante ester groups. These applications include printed wire circuit boards (PCWBs) and radomes. Recently, these resins have been proposed as materials for use as the matrix in structural composites used in civilian air transport. In this application, the organic materials must exhibit low flammability as well as having the appropriate strength and toughness for this type of application. CERs, by themselves possess appropriate flammability properties, but are too brittle for use alone as matrix materials for structure composites. However, their toughness can be greatly enhanced by the introduction of modifiers such as thermoplastics or elastomers. Siloxane based elastomers provide both the requisite improvement in toughness as well as having excellent flame retardency.