Reactive compatibilization of poly(l-lactic acid)/poly(propylene carbonate) blends: Thermal, thermomechanical, and morphological properties

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[1] Hwang, Sung Wook
[2] Park, Dong Ho
[3] Kang, Dong Ho
[4] Lee, Sang Bong
[5] Shim, Jin Kie
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Shim, Jin Kie (jkshim@kitech.re.kr) | 1600年 / John Wiley and Sons Inc卷 / 133期
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Poly(l-lactic acid) (PLLA) was blended with poly(propylene carbonate) (PPC) with various compositions by a melt-blending process to evaluate their general properties for a potential flexible packaging field. The mechanical properties; including the tensile strength and modulus; revealed a tendency to decrease with the addition of ductile PPC; this was induced by the poor interfacial adhesion between PLLA and PPC with the cavities and clear edges and was observed through morphological observation. Reactive compatibilization was applied to improve the interfacial adhesion between PLLA and PPC; and the elongation at break was profoundly enhanced because of the improved interfacial adhesion between the two phases. The compatibilized PLLA/PPC blends showed considerable improvements in the storage modulus in the transition region with stable thermal stability; this could be a benefit for thermal processing. The addition of PPC had a great effect on the solidlike behavior and increased the elasticity of the PLLA/PPC blends. Up to 2.0 phr maleic anhydride showed a great efficiency in enhancing the dynamic storage modulus and complex viscosity of the PLLA/PPC blends. We also confirmed that it was feasible to fabricate PLLA/PPC blends with controllable barrier properties with combination of PLLA and PPC under reactive compatibilization while retaining the biodegradability. © 2016 Wiley Periodicals; Inc;
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