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A Design-of-Experiment Study on the Microcellular Extrusion of Sub-critical CO2 Saturated PLA Pellets

  • D. Miller and V. Kumar
Published/Copyright: April 6, 2013
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Abstract

In this study we explore the use of solid-state nucleation in pellets as a means to decouple cell nucleation from cell growth in extrusion. This is achieved by feeding the extruder with gas-saturated PLA pellets. Cell nucleation occurs, similar to that of the well-studied solid-state batch foaming process, when gas-saturated pellets are crushed and heated in the feed section of the extruder. The polymer melt consequently contains the nucleated cells. Further, the gas content in the pellets provides a means to deliver a controlled amount of blowing agent for cell growth at the die exit. It was found that gas concentrations in partially desorbed pellets offers greater control of part density and foam morphology compared to that of fully saturated pellets at 2 MPa. Using Design-of-Experiment statistical methods it was found that gas concentration in the polymer was the most significant variable influencing foam density, whereas the extrudate cooling method was found to control cell size.


Mail address: Dustin Miller, Department of Mechanical Engineering, University of Washington, Seattle, WA 98195, USA. E-mail:

References

Baldwin, D. F., et al., “An Extrusion System for the Processing of Microcellular Polymer Sheets: Shaping and Cell Growth Control”, Polym. Eng. Sci., 36, 14251435(1996), DOI: 10.1002/pen.10537Search in Google Scholar

Barlow, C., et al., “Impact Strength of High Density Solid-state Microcelluar Polycarbonate Foams”, J. Eng. Mater. Technol., 123, 229233(2001), DOI: 10.1115/1.1339004Search in Google Scholar

Behravesh, A. H., et al., “Approach to the Production of Low-density, Microcellular Foams in Extrusion”, SPE ANTEC Tech. Papers, 19581967(1998)Search in Google Scholar

Collias, D. I., et al., “Impact Toughening of Polycarbonate by Microcellular Foaming”, Polymer, 35, 39783983(1994), DOI: 10.1016/0032-3861(94)90283-6Search in Google Scholar

Gendron, R., Daigneault, L. E., “Continuous Extrusion of Microcellular Polycarbonate”, Polym. Eng. Sci., 43, 13611377(2003), DOI: 10.1002/pen.10116Search in Google Scholar

Guo, G., et al., “Effects of Nanoparticles on the Density Reduction and Cell Morphology of Extruded Metallocene Polyethylene/Wood Fiber Nanocomposites”, J. Appl. Polym. Sci., 104, 10581063(2007), DOI: 10.1002/app.25778Search in Google Scholar

Guo, M. C., Peng, Y. C., “Study of Shear Nucleation Theory in Continuous Microcellular Foam Extrusion”. Polym. Test., 22, 705709(2003), DOI: 10.1016/S0142-9418(03)00004-7Search in Google Scholar

Han, X., et al., “Continuous Microcellular Polystyrene Foam Extrusion with Supercritical CO2”, Polym. Eng. Sci., 42, 20942106(2002), DOI: 10.1002/pen.11100Search in Google Scholar

Han, X., et al., “Effect of Die Temperature on the Morphology of Microcellular Foams”. Polym. Eng. Sci., 43, 12061220(2003a), DOI: 10.1002/pen.10102Search in Google Scholar

Han, X., et al., “Extrusion of Polystyrene Nanocomposite Foams with Supercritical Co2”, Polym. Eng. Sci., 43(6), 12611275(2003b), DOI: 10.1002/pen.10107Search in Google Scholar

Kramschuster, A., et al., “Injection Molded Solid and Microcellular Polylactide Compounded with Recycled Paper Shopping Bag Fibers”. Int. Polym. Proc., 22, 436445(2007)Search in Google Scholar

Kumar, V., et al., “A Study of PLA Crystallization During Solid-state Foaming”, NSF Engineering Research Innovation Conference, Knoxville, USA (2008)Search in Google Scholar

Kumar, V., et al., “Extrusion of Microcellular Foams Using Pre-saturated Pellets and Solid-State Nucleation”, Cellular Polymers, 23, 369385(2004)Search in Google Scholar

Lee, J. W. S., et al., “Challenge to Extrusion of Low-density Microcellular Polycarbonate Foams Using Supercritical Carbon Dioxide”, Ind. Eng. Chem. Res., 44, 9299(2004), DOI: 10.1021/ie0400402Search in Google Scholar

Lee, S. T., et al., “Study of Thermoplastic PLA Foam Extrusion”, J. Cell. Plast., 44, 293305(2008), DOI: 10.1177/0021955X08088859Search in Google Scholar

Martini, J., et al., “Microcellular Closed Cell Foams and Their Method of Manufacture”, #4473665, Massachusetts Institute of Technology, Cambridge, USA (1984)Search in Google Scholar

Martini, J., et al., “The Production and Analysis of Microcellular Thermoplastic Foam”, SPE ANTEC Tech. Papers, 674676(1982)Search in Google Scholar

Matuana, L. M., “Solid State Microcellular Foamed Poly(Lactic Acid): Morphology and Property Characterization”, Bioresource Technology, 99, 36433650(2007), PMid:17855079; DOI: 10.1016/j.biortech.2007.07.062Search in Google Scholar PubMed

Matuana, L. M., et al., “Cell Morphology of Extrusion Foamed Poly(Lactic Acid) Using Endothermic Chemical Foaming Agent”, Bioresource Technology, 100, 59475954(2009), PMid:19615893; DOI: 10.1016/j.biortech.2009.06.063Search in Google Scholar PubMed

Park, C. B., et al., “Low Density Microcellular Foam Processing in Extrusion Using CO2”, Polym. Eng. Sci., 38, 18121823(1998), DOI: 10.1002/pen.10351Search in Google Scholar

Park, C. B., Suh, N. P., “Extrusion of Microcellular Polymers Using a Rapid Pressure Drop Device”, SPE ANTEC Tech. Papers, 18181821(1993)Search in Google Scholar

Park, C. B., Suh, N. P., “Filamentary Extrusion of Microcellular Polymers Using a Rapid Decompressive Element”, Polym. Eng. Sci., 36, 3448(1996), DOI: 10.1002/pen.10382Search in Google Scholar

Pilla, S., et al., “Microcellular Extrusion Foaming of Poly(Lactide)/Poly(Butylene Adipate-Co-Terephthalate) Blends”, Mater. Sci. Eng., 30, 255262(2009)Search in Google Scholar

Richards, E., et al., “Biodegradable Composite Foams of PLA and PHBV Using Subcritical CO2”, J. Polym. Environ., 16, 258266(2008), DOI: 10.1007/s10924-008-0110-ySearch in Google Scholar

Schirmer, H. G., Kumar, V., “Novel Reduced Density Materials by Solid-state Extrusion: Proof-of-Concept Experiments”, Cellular Polymers, 22, 157174(2003)Search in Google Scholar

Seeler, K. A., Kumar, V., “Effect of CO2 Saturation and Desorption on the Fatigue Life of Polycarbonate”, J. Eng. Mater. Technol., 116, 451456(1994), DOI: 10.1115/1.2904312Search in Google Scholar

Shimbo, M., et al., “Mechanism of Strength Improvement of Foamed Plastics Having Fine Cell”, J. Cell. Plast., 3, 157167(2007), DOI: 10.1177/0021955X06075585Search in Google Scholar

Shimbo, M., et al., “Foams Extrusion Technology of Microcellular Plastics”, Porous, Cellular and Microcellular Materials: ASME, 82, 9398(1998)Search in Google Scholar

Srikanth, P., et al., “Microcellular Extrusion-Foaming of Polylactide with Chain-extender”, Polym. Eng. Sci., 49, 16531660(2009), DOI: 10.1002/pen.21385Search in Google Scholar

Wang, X., et al., “Low Density Sub-citical CO2-Blown PLA Foams”, Cellular Polymers, 26, 15(2007)Search in Google Scholar

Received: 2011-01-06
Accepted: 2011-04-19
Published Online: 2013-04-06
Published in Print: 2011-11-01

© 2011, Carl Hanser Verlag, Munich

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