Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Interface Adhesion of E-Glass Fibers in Model Polyisocyanurate Networks



Walter G. McDonough, Gale A. Holmes, R C. Peterson


Recent work examining the nature of the failure process of glass/epoxy specimens in the single fiber fragmentation test showed that the matrix exhibited pronounced non-linear viscoelastic behavior during the test, and that the interfacial shear strength value obtained was dependent on the rate of testing. Furthermore, it was demonstrated that the load in the sample at the end of the test was much lower than the value predicted by assuming linear-elastic behavior, and that the first fragment break occurred when the actual load in the matrix deviated from the linear-elastic prediction. To study these issues further, the testing protocol was repeated using a polyisocyanurate resin to see if a similar non-linear viscoelastic response was observed. One result from this study was that the polyisocyanurate matrix did show non-linear viscoelastic behavior similar to the epoxy matrix. Interestingly, from preliminary results, the fiber fragmentation distribution of the glass/polyisocyanurate specimens was found to be independent of the strain rate used during the test, so that the calculated interfacial shear strength appears rate independent. This result contrasted with that of the glass/epoxy specimens where the fiber fragmentation distribution, and thus, the measured interfacial shear strength, was dependent on the rate of strain.
Proceedings Title
Proceedings of the 13th annual technical conference on composite materials
Conference Dates
September 21-23, 1998
Conference Location
Baltimore , MD
Conference Title
Technical Conference on Composite Materials


adhesion, fragmentation, glass, interface, polyisocyanurate, polymer viscoelasticity


McDonough, W. , Holmes, G. and Peterson, R. (1998), Interface Adhesion of E-Glass Fibers in Model Polyisocyanurate Networks, Proceedings of the 13th annual technical conference on composite materials, Baltimore , MD, [online], (Accessed July 22, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created September 23, 1998, Updated February 19, 2017