Synthesis and properties of polylactic acid-starch-malonic acid biofilm

Polylactic acid (PLA) is a thermoplastic and linear aliphatic polyester that is very similar to plastic.This biodegradable thermoplastic film is derived from renewable plant sources such as corn, potato,and sugar beet, which is widely used in the fields of medicine, textiles, and packaging of consumergoods. Preventing the increase of greenhouse gases and environmental pollution, compatibility withthe tissue of living organisms, and reducing the use of petroleum resources in production are the mainadvantages of using polylactic acid compared to today's plastics. Among the types of syntheticbiodegradable polymers, PLA as a polyester is obtained from lactic acid polymerization as arenewable source, which has attracted the most attention for mixing with synthetic polymers drawnfrom biological and agricultural sources. In this research, Fourier transform infrared spectroscopy(FTIR) and X-ray crystallography (XRD) characterization were done to characterize the propertiesof PLA-starch-malonic acid biofilm. The XRD peak around ۲θ~۲۰۲ indicated the alpha crystalstructure of the biopolymer. The FTIR results showed that there is a strong absorption peak at thewavenumber of ۱۴۷۱, ۱۴۷۱, and ۱۴۷۷ cm-۱. These peaks were attributed to the stretching modes ofvibration of the C=O carbonyl group. The acquired film will be favorable candidates in the foodindustry and they will provide a good opportunity to replace traditional oil-derived plastics thanks tobeing biodegradable materials.

کلیدواژه ها:

Biopolymers ، Biofilm ، Corn starch ، Polylactic acid ، Malonic acid