Acousto-ultrasonic Monitoring of Glueline Curing. Part II. Gel and Cure Time

Authors

  • Frank C. Beall

Keywords:

Acousto-ultrasonics, ultrasonics, epoxy, glueline thickness, bonding

Abstract

Techniques reported in a previous paper, AU transmission through a 25-by 25-mm bond area, were applied to previous and new data to develop a more quantifiable approach to adhesive curing. An increase in half-time to cure with increased bond thickness was related to a corresponding increase in gel time, defined as t0.1. the time for one-tenth the change in ultrasonic transmission. Cure time (t0.5 -t0.1) was invariant with bond thickness. The effects of water and acetone additives to 30-min epoxy were analyzed using gel and cure time as a measure of curing acceleration or retardation. Acetone, a known retarder, affected both gelling and curing and had a greater effect than water at the same molar concentration.

References

Beall, F. C. 1987. Acousto-ultrasonic monitoring of glueline curing. Wood Fiber Sci. 19(2):204-214.nPotter, W. G. 1970. Epoxide resins. Springer-Verlag, New York.n

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Published

2007-06-22

Issue

Number 3 / July 1989

Section

Research Contributions

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