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Numerical analysis of polymer cure kinetics in isotropic conductive adhesives

Numerical analysis of polymer cure kinetics in isotropic conductive adhesives

Tilford, T., Morris, J.E., Ferenets, M., Rajaguru, P.R. ORCID: 0000-0002-6041-0517, Pavuluri, S., Desmulliez, M.P.Y. and Bailey, C. (2010) Numerical analysis of polymer cure kinetics in isotropic conductive adhesives. In: 33rd International Spring Seminar on Electronics Technology (ISSE), 2010. Polymer Electronics and Nanotechnologies: Towards System Integration . IEEE Xplore, Sovereign House, London, N3 1QB, UK, pp. 412-416. ISBN 978-1-4244-7849-1 (print), 978-1-4244-7850-7 (e-ISBN) (doi:10.1109/ISSE.2010.5547360)

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Abstract

The electrical and thermomechanical properties of isotropic conductive adhesive materials vary significantly during the material cure process as polymer crosslinking alters the molecular structure and volume of the material which, in turn, alters the percolation threshold causing step changes in the values of electrical and thermal conductivity within the material. It is therefore important to ensure that adhesive interconnects are sufficiently cured. As in-situ analysis of the cure state is highly complex, a number of numerical models have been developed to provide an estimate of cure. In this study, the accuracy of six cure kinetics models in determining the cure kinetics of commercially available isotropic conductive materials is assessed. Cure kinetics were determined experimentally using Differential Scanning Calorimetry (DSC) equipment. The numerical models were fitted to the experimental data using a particle swarm optimisation method, enabling the ultimate accuracy of the models to be determined. Results obtained show that the single-step autocatalytic model would appear to provide a more accurate estimate of cure kinetics process than the nth order type models or the more complex double step models. The overall accuracy of the models was found to be quite high with close agreement between experimental and numerical results. Further studies are required to consider the multi component nature of underfill and encapsulant materials.

Item Type: Conference Proceedings
Title of Proceedings: 33rd International Spring Seminar on Electronics Technology (ISSE), 2010
Additional Information: Date of conference: 12-16 May 2010
Uncontrolled Keywords: isotropic conductive adhesive materials, polymer crosslinking, cure kinetics models, Differential Scanning Calorimetry (DSC), particle swarm optimisation method
Subjects: T Technology > T Technology (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Pre-2014 Departments: School of Computing & Mathematical Sciences
School of Computing & Mathematical Sciences > Department of Computer Systems Technology
Related URLs:
Last Modified: 14 Oct 2016 09:19
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/7650

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