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Thermal Characterization of a Microlayered Polycarbonate/Polymethyl Methacrylate Composite

Published online by Cambridge University Press:  10 February 2011

Alex J. Hsieh  and
Alex W. Gutierrez
Alex J. Hsieh
Affiliation:
US Army Research Laboratory, Weapons and Materials Research Directorate, AMSRL-WM-MA, Aberdeen Proving Ground, MD 21005–5069
Alex W. Gutierrez
Affiliation:
US Army Research Laboratory, Weapons and Materials Research Directorate, AMSRL-WM-MA, Aberdeen Proving Ground, MD 21005–5069
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Abstract

Thermal behavior of a coextruded microlayer composite with 388 alternating layers of polycarbonate and polymethyl methacrylate (PMMA) was investigated using differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). Two distinct glass transition temperatures were observed with DSC for the coextruded composite, however both were shifted very slightly towards each other, compared to the glass transition temperatures of the pure components, indicating limited miscibility. Adhesion between the alternating microlayers appeared to be very good; delamination did not occur after the microlayer composite was subjected to a high speed impact test. Adhesion is attributed to limited miscibility since little mixing resulted from the laminar flow which was required in the coextrusion process. DMA results revealed an additional damping peak, which was not observed with DSC, at a temperature between the glass transitions of the two components. This intermediate transition peak is more sensitive to change in frequency compared to the response for the individual pure components.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 461: Symposia BB – Morphological Control in Multiphase Polymer Mix… , 1996 , 165
Copyright
Copyright © Materials Research Society 1997

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References

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