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Enhanced flexibility of biodegradable polylactic acid/starch blends using epoxidized palm oil as plasticizer

Awale, Raina Jama and Ali, Fathilah and Azmi, Azlin Suhaida and Mohamad Puad, Noor Illi and Anuar, Hazleen and Hassan, Azman (2018) Enhanced flexibility of biodegradable polylactic acid/starch blends using epoxidized palm oil as plasticizer. Polymers, 10 (9). ISSN 2073-4360

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Official URL: http://dx.doi.org/10.3390/polym10090977

Abstract

The brittleness of polylactic acid (PLA) has always limited its usage, although it has good mechanical strength. In this study, flexibility of PLA/starch (PSt) blend was enhanced using epoxidized palm oil (EPO) as the green plasticizer. The PLA/starch/EPO (PSE) blends were prepared while using the solution casting method by fixing the content of starch and varying ratio of EPO. The thermal properties, such as glass transition temperature (Tg), melting temperature (Tm), and crystallization temperature (Tcc) were decreased by increasing the amount of EPO into PSt, indicating that EPO increases the chain mobility. Thermogravimetric analysis (TGA) showed that thermal degradation resistance of PSE was higher when compared to PSt. The mechanical testing revealed that EPO at all contents improved the mechanical properties, such as increment of the elongation-at-break and impact strength. Whereas, dynamic mechanical analysis showed that the addition of filler into PLA decreased the storage modulus of PLA. The carbonyl group of the aliphatic ester remained the same in the PSE blends. The morphological study verified the ductility of PSE blends surface when compared to the brittle surface of PSt. As for the soil burial tests, EPO accelerated the degradation of blends. From these results, it can be concluded that EPO improved the flexibility of PLA blends.

Item Type:Article
Uncontrolled Keywords:biodegradable, epoxidized palm oil, green plasticizer, polylactic acid, solution casting, starch
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Chemical and Energy Engineering
ID Code:85974
Deposited By: Yanti Mohd Shah
Deposited On:30 Aug 2020 16:46
Last Modified:30 Aug 2020 16:46

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