Non-destructive DRIFT spectroscopy measurement of the degree of curing of industrial epoxy/silica composite buildup layers

The degree of curing of epoxy composites and coatings is one key parameter to control the reliability of manufacturing processes, particularly in printed circuit board (PCB) manufacturing where epoxy buildup composites are partially cured before processing. We show that the reaction of curing of an...

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Bibliographic Details
Published in:Polymer testing 2018-09, Vol.70, p.188-191
Main Authors: Granado, Lérys, Maurin, David, Kempa, Stefan, Gregoriades, Laurence J., Brüning, Frank, Fréty, Nicole, Anglaret, Éric, Bantignies, Jean-Louis
Format: Article
Language:English
Subjects:
Chemical Sciences
Circuit boards
Circuit reliability
Composite
Composite materials
Curing
Degree of curing
Destructive testing
DRIFT
Epoxy
Epoxy resins
Fillers
Fourier transforms
NIR
PCB
Polymer matrix composites
Printed circuits
Reflectance
Scientific imaging
Silica
Silicon dioxide
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Summary:The degree of curing of epoxy composites and coatings is one key parameter to control the reliability of manufacturing processes, particularly in printed circuit board (PCB) manufacturing where epoxy buildup composites are partially cured before processing. We show that the reaction of curing of an industrially relevant buildup composite (epoxy-phenol reinforced with silica fillers) can be monitored by diffuse reflectance infrared Fourier transform (DRIFT) in the near-infrared range. The accuracy of DRIFT measurements is confirmed by comparison with measurements in transmission mode on reference composite samples. DRIFT is demonstrated to offer an easy and reliable measurement of the epoxy degree of curing on PCB coupons. [Display omitted]
ISSN:0142-9418
1873-2348
DOI:10.1016/j.polymertesting.2018.07.007