0
TECHNICAL PAPERS

Impact Strength of High Density Solid-State Microcellular Polycarbonate Foams

[+] Author and Article Information
Chris Barlow, Brian Flinn, Rajendra K. Bordia

Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195

Vipin Kumar

Department of Mechanical Engineering, University of Washington, Seattle, WA 98195

John Weller

Deparment of Mechanical Engineering, University of Washington, Seattle, WA 98195

J. Eng. Mater. Technol 123(2), 229-233 (Sep 19, 2000) (5 pages) doi:10.1115/1.1339004 History: Received July 07, 1999; Revised September 19, 2000
Copyright © 2001 by ASME
Your Session has timed out. Please sign back in to continue.

References

Sue,  H. J., Huang,  J., and Yee,  A. F., 1992, “Interfacial Adhesion and Toughening Mechanisms in an Alloy of Polycarbonate/Polyethylene,” Polymer, 33, No. 22, pp. 4868–4871.
Collias,  D. I., Baird,  D. G., and Borggreve,  R. J. M., 1994, “Impact Toughening of Polycarbonate by Microcellular Foaming,” Polymer, 35, No. 18, pp. 3978–3983.
Seeler,  K. A., and Kumar,  V., 1995, “Decoupling the Effects of the Matrix Properties and Foam Structure on the Mechanical Properties of Microcellular Foam by Sub-Tg Annealing,” J. Reinf. Plast. Compos., 14, pp. 1054–1068.
Kumar,  V., and Weller,  J. E., 1994, “Production of Microcellular Polycarbonate Using Carbon Dioxide for Bubble Nucleation,” ASME J. Ind., 116, pp. 413–421.
Weller, J. E., 1996, “The Effects of Processing and Microstructure on the Tensile Behavior of Microcellular Foams,” Ph.D. thesis, Dept. of Mechanical Engineering, University of Washington, Seattle.
Holl,  M., 1994, “The University of Washington Saturation Vessel Pressure and Temperature Control System,” Cellular Composites Consortium Report #8, University of Washington, Seattle, WA.
Annual Book of ASTM Standards, 1996, Vol. 8.01, American Society for Testing and Materials, Philadelphia, PA, pp. 1–18, 293–296.
Underwood, E. E., 1970, Quantitative Stereology, Addison-Wesley, Reading, MA.
Wu,  S., 1987, “A Generalized Criterion for Rubber Toughening: The Critical Matrix Ligament Thickness,” Polym. Prepr. (Am. Chem. Soc. Div. Polym. Chem.), 28, No. 2, pp. 179–80.
van der Sanden,  M. C. M., Meijer,  H. E. H., and Lemstra,  P. J., 1993, “Deformation and Toughness of Polymeric Systems: 1. The Concept of a Critical Thickness,” Polymer, 34, No. 10, pp. 2948–2154.
van der Sanden,  M. C. M., Meijer,  H. E. H., and Tervoort,  T. A., 1993, “Deformation and Toughness of Polymeric Systems: 2. Influence of Entanglement Density,” Polymer, 34, No. 14, pp. 2961–2170.

Figures

Grahic Jump Location
SEM micrographs of Izod impact fracture surfaces at various densities and cell sizes. (a) Relative density = 0.89, average cell size = 4.3 μm, (b) Relative density = 0.71, average cell size =18 μm.
Grahic Jump Location
Izod impact strength as a function of relative density. Note the different samples at different times after foam to determine the effect of foaming gas on impact strength.
Grahic Jump Location
Relative Izod impact strength as a function of relative foam density
Grahic Jump Location
Izod impact strength as a function of average cell size. Note that all cell size samples in this plot have a relative density = 0.7. A line has been drawn through the data to aid the eye.
Grahic Jump Location
Relative Izod impact strength as a function of average cell size. Note that all cell size samples in this plot have a relative density = 0.7. A line has been drawn through the data to aid the eye.
Grahic Jump Location
Simplified model of pore structure used to calculate cell wall thickness
Grahic Jump Location
Calculated ligament thickness as function of cell size for relative density =0.7. A line has been drawn through the data to aid the eye.
Grahic Jump Location
Izod impact strength as function of calculated ligament thickness from Eq. (1.2). A line has been drawn through the data to aid the eye.

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In