Abstract
In this report, poly(lactic acid) (PLA) and Poly(butylene adipate-co-terephthalate) (PBAT) with three kinds of compatibilizers were melt blended under intensive shear flow. A self-made parallel three-screw extruder was developed to generate such flow during the process. Mechanical properties, chemical reactions among PLA, PBAT and compatibilizers, rheological behavior and morphology were investigated. The mechanical tests showed that the notched impact strength of super-tough composite with 10 wt% EGMA is about 20 times than that of pure PLA. The Fourier transform infrared spectroscopy (FT-IR) results showed that the epoxy functional groups or maleic anhydride functional groups of KT-20, KT-915 and EGMA reacted with the hydroxyl groups of PLA or PBAT macromolecules, resulting in a bridge of PLA and PBAT. About rheological properties, the tan δ—angular frequency curves and the η’’- η’ curves confirmed the chemical reactions mentioned above and indicated better compatibility of η’’- η’ between PLA and PBAT, respectively. Meanwhile, the loss modulus and storage modulus—angular frequency curves demonstrated the discrepancy of different compatibilizer components. In particular, from scanning electron microscopy (SEM) images, it can be seen that the phase size and dispersion uniformity of PBAT adjusted by compatibilizer, corresponding to better compatibility that is described in the η’’- η’ curves. The approach for producing super-tough PLA/PBAT/compatibilizer by intensive shear flow provides a viable direction for further improving PLA performance.
Highlights
Poly(lactic acid) (PLA), a green polymer material, can be synthesized via polymerization of lactic acid which is fermented by glucose [1]
The microstructures of the PLA/Poly(butylene adipate-co-terephthalate) (PBAT)/compatibilizer blends observed by scanning electron microscopy (SEM) are shown in dispersed phase morphology; and red squares are assumed to have a very small PBAT dispersed phase morphology in this paper
A series of blends consisting of three different compatibilizers and PLA/PBAT was
Summary
Poly(lactic acid) (PLA), a green polymer material, can be synthesized via polymerization of lactic acid which is fermented by glucose [1]. Zhou [21] introduced strong shear flow into the processing of PLA/PBAT blends It constructed a a coexisting structure of tightly arranged shish-kebabs and PBAT fibers at the interface by strong coexisting structure of tightly arranged shish-kebabs and PBAT fibers at the interface by strong shear shear flow, which improved the comprehensive mechanics of the material. Based on this operation are the key factors that affect the performance of the blend Based on this equipment with equipment with fixed type and arrangement of the screw elements as well as fixed process conditions, fixed of compatibilizers the screw elements well as fixed conditions, the effect of three the type effectand of arrangement three different for as wasprocess investigated to achieve excellent different compatibilizers mechanical properties. Figure ofthe theself-made self-madeparallel parallelthree-screw three-screw extruder
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