Poly(lactic) acid (PLA) is recognized as one of the polymers with most potential in biodegradable packaging industries. However, PLA is too brittle to be used as thin films. To increase the flexibility of PLA, 1, 3, and 5 wt% of polyethylene oxide (PEO) having 100,000 Mw were added into PLA respectively. The blends were compounded and were extruded using a kneader and a twin-screw extruder. The mechanical and thermal properties of PLA blends were analyzed to prove the increase of ductility. In addition, hydrophilic properties, morphologies, and crystallization behaviors of PLA based films were investigated. The addition of PEO into PLA increased the elongation at break, Izod impact strength, hydrophilicity, and the degree of crystallinity, as well as decreased the glass transition temperature (Tg), melting temperature (Tm), cold crystallization temperature (Tcc), and tensile strength of PLA. Significantly, the elongation at break was increased by 4 times at 5 wt% PEO loading, while the tensile strength was decreased by 17% only. PLA based films were greatly increased in ductility by blending with PEO.
Pivsa-Art W, Fujii K, Nomura K et al (2016) The effect of poly(ethylene glycol) as plasticizer in blends of poly(lactic acid) and poly(butylene succinate). J Appl Polym Sci. https://doi.org/10.1002/app.43044
Chaiwutthinan P, Pimpan V, Chuayjuljit S, Leejarkpai T (2015) Biodegradable plastics prepared from poly(lactic acid), poly(butylene succinate) and microcrystalline cellulose extracted from waste-cotton fabric with a chain extender. J Polym Environ 23:114–125. https://doi.org/10.1007/s10924-014-0689-0CrossRefGoogle Scholar
Chen R, Abdelwahab MA, Misra M, Mohanty AK (2014) Biobased ternary blends of lignin, poly(lactic acid), and poly(butylene adipate-co-terephthalate): the effeczt of lignin heterogeneity on blend morphology and compatibility. J Polym Environ 22:439–448. https://doi.org/10.1007/s10924-014-0704-5CrossRefGoogle Scholar
Russo P, Cammarano S, Bilotti E et al (2014) Physical properties of poly lactic acid/clay nanocomposite films: effect of filler content and annealing treatment. J Appl Polym Sci. https://doi.org/10.1002/app.39798