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Biodegradable Composite Foams of PLA and PHBV Using Subcritical CO2


One key strategy for increasing the application potential for biodegradable plastics lies in improving the physical and mechanical characteristics, which can be attained by inducing a cellular morphology in the pure polymer with the aid of a blowing agent, as well as by blending two or more polymers with the desirable properties. This paper examines the effect that blending two biodegradable polymers has on the thermal properties and morphology of the resultant foams blown with carbon dioxide (CO2). Polylactic acid (PLA), polyhydroxybutyrate-co-valerate (PHBV) and blends of both were foamed and characterized in terms of thermal characteristics, relative density, cell size, and foam morphology. The results indicate that although PLA and PHBV are immiscible, the presence of small quantities of PHBV (25 wt%) could lead to low density foams with finer, more uniform cells. Furthermore, the crystallinity of PHBV was found to be unaffected by the presence of PLA in the composite, which supports the immiscibility of PLA and PHBV.

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  1. Bohlmann GM (2005) In: Bastioli C (ed) Handbook of biodegradable polymers. Rapra Technology, Shawbury, pp 183–217

  2. Philip S, Keshavarz T, Roy I (2007) J Chem Tech Biotechnol 82:233–247

    Article  CAS  Google Scholar 

  3. Calmon A, Guillaume S, Bellon-Maurel V, Feuilloley P, Silvestre F (1999) J Environ Polym Degrad 7(3):157–166

    Article  CAS  Google Scholar 

  4. Mikos AG, Thorsen AJ, Czerwonka LA, Bao Y, Langer R, Winslow DN, Vacanti JP (1994) Polymer 35(5):1068–1077

    Article  CAS  Google Scholar 

  5. Lo H, Ponticiello MS, Leong KW (1995) Tissue Eng 1(1):15–28

    Article  CAS  Google Scholar 

  6. Nunes SP (1997) Trends Polym Sci 5(6):187–192

    CAS  Google Scholar 

  7. Wood LA (1958) J Polym Sci 28:319–330

    Article  CAS  Google Scholar 

  8. Iannace S, Ambrosio L, Huang SJ, Nicolais L (1994) J Appl Polym Sci 54(10):1525–1535

    Article  CAS  Google Scholar 

  9. Cai H, Dave V, Gross RA, McCarthy SP (1996) J Polym Sci B Polym Phys 34:2701–2708

    Article  Google Scholar 

  10. Pyda M, Wunderlich B (2005) Macromolecules 38(25):10472–10479

    Article  CAS  Google Scholar 

  11. Wang H, Sun X, Seib P (2003) J Appl Polym Sci 90:3683–3689

    Article  CAS  Google Scholar 

  12. Li J, Lai MF, Liu JJ (2005) J Appl Polym Sci 98:1427–1436

    Article  CAS  Google Scholar 

  13. Hu X, Naguib H, Nawaby V, Day M, Liao X, Ueda K (2005) In: SPE annual technical conference proceedings, vol 7, pp 187–190

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Correspondence to Hani Naguib.

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Richards, E., Rizvi, R., Chow, A. et al. Biodegradable Composite Foams of PLA and PHBV Using Subcritical CO2 . J Polym Environ 16, 258–266 (2008).

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  • Polylactic acid
  • Polyhydroxybutyrate-co-valerate
  • Blends
  • Foams