Physical properties and biodegradability of blends containing poly(ε-caprolactone) and tropical starches
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Abstract
In order to assess feasibility of tropical starches (sago and cassava starches) as biodegradable plastic materials, blending with poly(ε-caprolactone) (PCL), a biodegradable polymer, was carried out. It was confirmed that the physical properties (tensile strength and elongation) of PCL/sago and PCL/cassava blends were similar to those of PCL/corn blend, suggesting that sago and cassava starches can also be blended with PCL for production of biodegradable plastic. However, the properties of all PCL/starch blends were still low compared with those of polyethylene. Enzymatic degradability evaluation showed that lipase degradation of PCL andα-amylase degradation of starch increased as the starch content in the blend increased. Burial test of the blends for 1, 3, and 5 months was carried out and the rate of degradation of the PCL/sago blend was confirmed to be slower than those of PCL/corn and PCL/cassava blends. Observation of the film blends structure by scanning electron microscope revealed that the starch was dispersed in a PCL continuous phase. Furthermore, changes in the film surface before and after enyzme treatments were observed.
Key words
Poly(ε-caprolactone) (PCL)/sago blend PCL/cassava blend PCL/corn blend physical properties enzymatic degradabilityPreview
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References
- 1.G. Nishikawa, K. Oda, and H. Suganuma (1979)Jpn. J. Trop. Agr. 23, 123.Google Scholar
- 2.I. Nagato and H. Shimoda (1979)Jpn. J. Trop. Agr. 23, 160.Google Scholar
- 3.S. Takagi, M. Koyama, H. Kameyama, and Y. Tokiwa (1994) in Y. Doi and K. Fukuda (Eds.),Biodegradable Plastics and Polymers, Elsevier Science, Amsterdam, pp. 437–442.Google Scholar
- 4.G. J. L. Griffin (1973)Am. Chem. Soc. Div. Org. Coat. Plast. Chem. 33, 88–92.Google Scholar
- 5.A. C. Albertsson, C. Barenstedt, and S. Karlsson (1987)Polym. Degrad. Stabil. 37, 163–171.Google Scholar
- 6.B. A. Ramsay, V. Langlade, P. J. Carreau, and J. A. Ramsay (1993)Appl. Environ. Microbiol. 59, 1242–1246.PubMedGoogle Scholar
- 7.G. F. Fanta and W. M. Doane (1986) in O. B. Wurzburg (Ed.),Modified Starches: Properties and Uses, CRC Press, Boca Raton, FL, pp. 149–178.Google Scholar
- 8.A. Iwamoto and Y. Tokiwa (1994)Polym. Degrad. Stabil. 45, 205–213.Google Scholar
- 9.C. V. Benedict, W. J. Cook, P. Jarrett, J. A. Cameron, S. J. Huang, and J. P. Bell (1983)J. Appl. Polym. Sci. 28, 327–334.Google Scholar
- 10.Y. Tokiwa, T. Suzuki, and K. Takeda (1986)Agr. Biol. Chem. 30, 1323–1325.Google Scholar
- 11.H. Pranamuda, Y. Tokiwa, and H. Tanaka (1995)Appl. Environ. Microbiol. 61, 1828–1832.Google Scholar
- 12.K. Kainuma, H. Ishigami, and S. Kobayashi (1985)J. Soc. Starch Sci. 32, 136–141.Google Scholar