Assessment of the Degradability of Commercially-Available Biodegradable Plastic Utensils in Soil and UV

Abstract:

Biodegradable plastics are viewed as one of the most promising solutions to plastic waste dilemma due to its natural degradative properties. Fossil fuel-based polymers have been infused with bio-based additives (e.g. starch) and have been used to produce biodegradable plastic products such as bags and cutleries. While several studies have dealt with degradation of polymers with bio-based additives, there is work yet to be done on degradation of commercially-available biodegradable plastic products. Here we evaluate degradability upon exposure to soil incubation and UV of three common starch-based plastic utensil brands in the Philippines that claim biodegradability. Analysis of IR absorbance spectra of post-exposure samples indicated high propensity towards photodegradation. Furthermore, estimation of full degradation period confirmed the biodegradability of starch-amended plastics which were limited to two brands. The presence of 19.22% and 24.18% starch in the plastic showed complete decomposition period of 156 and 92 days, respectively. This is a significant improvement over poor degradability exhibited by conventional plastics which often takes 450 to 1000 years. The reduction of degradation time through starch incorporation may prove to benefit manufacturers in fabricating more environmentally-friendly plastic products in the future.

• Periodical: Key Engineering Materials (Volume 821)
• Pages: 359-365
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.821.359
• Online since: September 2019
• Authors: Karl Vincent N. Alvarez*, Regina Mae V. Bulaong, Eloisa Nher A. Hipolito, Jonard Jairo P. Reyes, Astrid Ayla Liberato, Leslie Joy L. Diaz
• Keywords: Biodegradable Plastics, Biodegradation, Photodegradation, Polymer Degradation

References

[1] J. H. Tibbetts, Managing Marine Plastic Pollution: Policy Initiatives to Address Wayward Waste,, Environ. Health Perspect., vol. 123, no. 4, pp. A90–A93, Apr. (2015).

DOI: 10.1289/ehp.123-a90

[2] W. C. LI, H. F. TSE, and L. FOK, Plastic waste in the marine environment: A review of sources, occurrence and effects,, Sci. Total Environ., vol. 566–567, p.333–349, Oct. (2016).

DOI: 10.1016/j.scitotenv.2016.05.084

[3] Greenpeace: PH is third worst plastic polluter of oceans,, Agence France-Presse, 23-Sep-(2017).

[4] A. Merkl, Stemming the Tide: Land-based strategies for a plastic-free ocean,, (2015).

[5] J. R. Jambeck et al., Plastic waste inputs from land into the ocean,, Science (80-. )., vol. 347, no. 6223, p.768 LP-771, Feb. (2015).

DOI: 10.1126/science.1260352

[6] Philippine Solid Wastes,, Manila, (2017).

[7] J. Arutchelvi, M. Sudhakar, A. Arkatkar, M. Doble, S. Bhaduri, and P. V. Uppara, Biodegradationof polyethylene and polypropylene,, Indian J. Biotechnol., vol. 7, p.9–22, (2008).

[8] Plastics recycling: Economic and Ecological Options,, ICPE, 2006. [Online]. Available: http://www.envis-icpe.com.

[9] A. A. Shah, F. Hasan, A. Hameed, and S. Ahmed, Biological degradation of plastics: A comprehensive review,, Biotechnol. Adv., vol. 26, no. 3, p.246–265, May (2008).

DOI: 10.1016/j.biotechadv.2007.12.005

[10] H. Cui, R. Hanus, and M. R. Kessler, Degradation of ROMP-based bio-renewable polymers by UV radiation,, Polym. Degrad. Stab., vol. 98, no. 11, p.2357–2365, Nov. (2013).

DOI: 10.1016/j.polymdegradstab.2013.08.003

[11] J. Tong, Quantifying Color Difference: A Comparison betwen Spatial Frequency Domain Imagine to Digital Color Imaging in Assessment of Reconstructive Flap Occlusions,, UCI Undergrad. Res. J., p.45–54, (2015).

[12] N. Lucas, C. Bienaime, C. Belloy, M. Queneudec, F. Silvestre, and J.-E. Nava-Saucedo, Polymer biodegradation: Mechanisms and estimation techniques – A review,, Chemosphere, vol. 73, no. 4, p.429–442, Sep. (2008).

DOI: 10.1016/j.chemosphere.2008.06.064

[13] B. Singh and N. Sharma, Mechanistic implications of plastic degradation,, Polym. Degrad. Stab., vol. 93, no. 3, p.561–584, Mar. (2008).

[14] S. Chinaglia, M. Tosin, and F. Degli-Innocenti, Biodegradation rate of biodegradable plastics at molecular level,, Polym. Degrad. Stab., vol. 147, p.237–244, Jan. (2018).

DOI: 10.1016/j.polymdegradstab.2017.12.011

[15] H. C. Obasi, I. O. Igwe, and I. C. Madufor, Effect of Soil Burial on Tensile Properties of Polypropylene/Plasticized Cassava Starch Blends,, Adv. Mater. Sci. Eng., vol. 2013, p.5, (2013).

DOI: 10.1155/2013/326538

[16] J. Sarasa, J. M. Gracia, and C. Javierre, Study of the biodisintegration of a bioplastic material waste,, Bioresour. Technol., vol. 100, p.3764–3768, (2009).

DOI: 10.1016/j.biortech.2008.11.049

[17] Y. Tokiwa, P. B. Calabia, U. C. Ugwu, and S. Aiba, Biodegradability of Plastics,, International Journal of Molecular Sciences , vol. 10, no. 9. (2009).

DOI: 10.3390/ijms10093722

[18] S. M. Emadian, T. T. Onay, and B. Demirel, Biodegradation of bioplastics in natural environments,, Waste Manag., vol. 59, p.526–536, (2017).

DOI: 10.1016/j.wasman.2016.10.006

[19] A. G. Montecillo, J. Bayogan, J. Natividad, and L. J. L. Diaz, Thermal Analysis of Commercial Plastic Utensils with Claims of Biodegradability,, Diliman, Quezon City, (2017).

[20] M. R. Jung et al., Validation of ATR FT-IR to identify polymers of plastic marine debris, including those ingested by marine organisms,, Mar. Pollut. Bull., vol. 127, p.704–716, (2018).

DOI: 10.1016/j.marpolbul.2017.12.061

[21] J. Coates, Interpretation of Infrared Spectra, A Practical Approach,, in Encyclopedia of Analytical Chemistry, R. A. Meyers, Ed. Chichester: John Wiley & Sons, Ltd, 2000, p.10815–10837.

[22] R. O. Ebewele, Polymer Science and Technology. New York: CRC Press, (2000).