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Thermal Penetration Times as a Nondestructive Measure of Orientation in Polyimide Film

  • C. Chandler (a1), N.E. Mathis (a1) and R.J. Samuels (a2)

Abstract

Material properties depend on their fabricated structure and orientation. It is thus important to develop rapid nondestructive techniques that will both allow determination of the orientation fabricated, and identify any changes that occur over time as a result of subsequent in service environmental conditions.

The present study examines the relationship between the thermal penetration time and planarity in polyimide films. Polyimides are advanced materials that have good high temperature stability, excellent dimensional stability, and excellent mechanical, electrical, and chemical resistance properties. The samples tested were specially prepared to range in orientation from three dimensionally random to highly planar. The molecular structure and orientation in the polyimide film was characterized by polarizing microscope techniques, while the thermal penetration time measurements utilized a new rapid nondestructive modified hot wire instrument.

This correlation will be the first time thermal penetration time has been measured by modified hot wire techniques and related to the internal structure of a polyimide. The work contributes to a deeper theoretical understanding of heat transfer mechanisms as they relate to orientation. Thermal penetration time evaluation could provide a new tool in the arsenal of structural characterization techniques.

This relationship between thermal penetration time and orientation is key for film manufacturers. Such a correlation has potential to speed the development cycles of new materials and assure properties during production and end-use applications.

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References

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[1] Cassidy, P. E., Thermally Stable Polymers: Synthesis and Properties, Marcel Dekker, Inc., New York (1980).
[2] Samuels, R. J., “Structured Polymer Properties. The Identification, Interpretation, and Use of Polymer Structure, ” Wiley-Interscience, New York, 1974.
[3] Samuels, R. J., “Polymer Structure: The Key to Process-Property Control”, special symposium issue of Polymer Engineering and Science entitled, “Polymer Process-Structure-Property Relationships”, 25, 864 (1985).
[4] Hardaker, S. and Samuels, R.J., “Quantitative Characterization of Anisotropic PMDA-ODA Film Properties”, in“Polyimides: Trends in Materials and Applications”, Feger, C., Khojasteh, M.M., and Molis, S.E., Eds., S.P.E. Pub., (1996) 267.
[5] Mathis, N.,“New Instrument for Thermal Management Design”, IMAPS International Symposium on Packaging Systems, San Diego, January 1999.
[6] Mathis, N., Picot, J.J.C., Orientation and Strength Correlations: A Review and Practical On-line Measurement Technique, Polymer Processing Society Conference Proceedings 1999.
[7] Cha, C. Y., Moghazy, S. and Samuels, R. J., “Optical Characterization of Three Dimensional Surface and Bulk Anisotropy in High Refractive Index Polymers”,Polym. Eng. Sci., 32, 1358 (1992).10.1002/pen.760321804
[8] Cha, C., and Samuels, R. J., “Effect of Orientation on the Relative Dispersion of PMDA-ODA Polyimide and Polypropylene”, J. Polymer Sci., Part B: Polymer Physics, 33, 259 (1995).10.1002/polb.1995.090330211
[9] Mathis, N.E., Browne, J., “Thermal Conductivity of Thin Film Carbon Fiber Die Attach”, SPE RETEC, (1998).
[10] Mathis, N.E.,“Eliminating Density and Heat Capacity Requirements in Transient Thermal Conductivity Measurements”, SPE ANTEC, (1999).

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