SAMPE Journal - July/August 2016 - 13

Feature Article

Figure 7. Microcracks in a stratified MTM45-1/HM63 discriminator panel after a standard cure/postcure to 177°C
and thermal cycling.

this combination of prepreg and adhesive would be
of concern for reasons illustrated by Figure 8. The
slow Tg development of the adhesive relative to that
of the prepreg would be of concern in respect of
the stability of the structure during the freestanding
postcure from 121°C/250°F to 177°C/350°F. Part
geometry and construction would be factors in
determining whether such a cure cycle would be
acceptable for this material combination. For a
simple flat panel supported on a plate such a cure
cycle could be acceptable (although skin disbond
concerns could be an issue if the core cavity was
not vented or the core inadequately dried), but
perhaps not for a large complex part with less
than perfect support during the postcure. This is
obviously a hypothetical example and an alternative
adhesive such as FM®209-1, MTA®240 or MTA®241

might be a more appropriate choice for such a
cure cycle, however the general principle is that
the characteristics of both the prepreg and the film
adhesive need to be considered when selecting cure
cycles for such structures. In addition, while kinetic
models such as those available with the Raven
software are powerful tools with which to explore
cure cycle options, practical trials will inevitably at
some point be required incorporating the features of
the structure to be built.
A more usual cure cycle for the combination of
CYCOM 5320-1and FM309-1 film adhesive is an
in-tool 177°C cycle with an intermediate dwell at
121°C. A comparison of Tg and viscosity for the
two materials through such a cure cycle is shown in
Figure 9. The dwell time at both 121°C and 177°C is
2 hours and the ramp rate throughout is 2°C/minute.

Figure 8. Comparison of CYCOM 5320-1
and FM309 for a 121°C initial cure and
freestanding postcure to 177°C.

SAMPE Journal, Volume 52, No. 4, July/August 2016

13



Table of Contents for the Digital Edition of SAMPE Journal - July/August 2016

Contents
SAMPE Journal - July/August 2016 - Cover1
SAMPE Journal - July/August 2016 - Cover2
SAMPE Journal - July/August 2016 - Contents
SAMPE Journal - July/August 2016 - 2
SAMPE Journal - July/August 2016 - 3
SAMPE Journal - July/August 2016 - 4
SAMPE Journal - July/August 2016 - 5
SAMPE Journal - July/August 2016 - 6
SAMPE Journal - July/August 2016 - 7
SAMPE Journal - July/August 2016 - 8
SAMPE Journal - July/August 2016 - 9
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SAMPE Journal - July/August 2016 - 11
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