Response of Modified Poly(lactic acid) to Microwave Radiation

Abstract:

The frozen instant food packaging is the one of disposal product, which produced from petroleum–based plastic and has been accumulated worldwide pressuring on the environment. Therefore, the biodegradable plastics have become key candidates in this application. Poly(lactic acid) (PLA) was regarded as one of the most promising biodegradable polymer due to its good mechanical properties. The aim of this work was to study on the freezability and microwavability of PLA through crosslink reaction. For the improvement of the processibility of PLA, hyperbranched polymer (HBP) and polypropylene glycol (PPG) were used as plasticizer. Then the crosslinking of PLA was introduced by addition of peroxide (Luperox101) and triallyl isocyanurate (TAIC) in an internal mixer. Neat and modified PLA samples were characterized and testing for mechanical properties. From the gel content results, it was showed the increased value with the increased content of TAIC due to the denser crosslinked structure of polymer. This result was confirmed by FT-IR spectra. All modified PLA samples showed the higher %strain at break than neat PLA. In addition, impact resistance in frozen state showed the results of modified PLA with 0.1wt% of peroxide and 0.15 wt% of TAIC, was higher than neat PLA. Moreover, this composition also showed the highest microwave response and heat accumulation was suppressed when the specimen was immersed in the water during the test. From the results obtained in this work, the further investigation is needed to pursue and elucidate the relationship between the polymer structure and heat absorption when materials undergo the microwave radiation.

• Periodical: Advanced Materials Research (Volumes 488-489)
• Pages: 1393-1397
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.488-489.1393
• Online since: March 2012
• Authors: Buranin Saengiet, Wasin Koosomsuan, Phassakarn Paungprasert, Rattikarn Khankrua, Sumonman Naimlang, Manus Seadan, Supakij Suttiruengwong
• Keywords: Biodegradable Plastics, Crosslinking, Microwave, Poly(lactic acid) (PLA)

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