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Real Time Small Angle X-Ray Scattering Measurements of Hips and ABS During Tensile Impact

Published online by Cambridge University Press:  26 February 2011

Robert A. Bubeck ,
Joseph A. Blazy ,
Edward J. Kramer ,
Donald J. Buckley Jr  and
Hugh R. Brown
Robert A. Bubeck
Affiliation:
The Dow Chemical Company, 1702 Building, Midland, MI 48674
Joseph A. Blazy
Affiliation:
The Dow Chemical Company, 1702 Building, Midland, MI 48674
Edward J. Kramer
Affiliation:
Cornell University, Dept. of Materials Science and Engineering, Bard Hall, Ithaca, NY 14883
Donald J. Buckley Jr
Affiliation:
Cornell University, Dept. of Materials Science and Engineering, Bard Hall, Ithaca, NY 14883
Hugh R. Brown
Affiliation:
IBM, Almaden Research Center, San Jose, CA 95120
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Abstract

One of the basic problems in the field of mechanical properties of polymers is the observation of the sequence of deformation events and the changes in microstructure associated with them during deformation at relatively high rates. Typically, well characterized polymer-samples are subjected to mechanical impact, and then various microscopy techniques are used to determine the deformation events (i.e., crazing, shear banding, cavitation) post mortem. Real time small angle X-ray scattering (RTSAXS) techniques, however, make possible the direct observation of scattering from crazes and voids while the deformation is in process. In this paper we report RTSAXS measurements, performed using intense synchrotron X-ray radiation, from a high impact polystyrene (HIPS) and an acrylonitrile butadiene styrene (ABS) copolymer during tensile impact. At a deformation rate of 4.2 cm/sec, (100 in./min), the ABS was found to absorb over ten times the impact energy of a HIPS sample. RTSAXS studies indicated: (1) that the ABS has a larger average craze fibril diameter than the HIPS (12.2nm vs. 8.7nm), (2) that localized shear occurs before crazing in the ABS, and (3) that the ABS sample generated 3.8 times the craze volume compared to the HIPS. The increase in craze volume alone, however, does not account for the greater toughness of the ABS, indicating the importance of the contribution of localized shear deformation to impact behavior.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 79: Symposium F – Scattering, Deformation and Fracture in Polymers , 1986 , 293
Copyright
Copyright © Materials Research Society 1987

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References

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