Abstract
Abstract A hyperbranched polyester polyol of the second generation (HBP2) was modified with polylactic acid (HBP2-g-PLA) and employed as a compatibilizer for plasticized tapioca starch (TPS)/polylactic acid (PLA) blends. The effect of the compatibilizer HBP2- g-PLA was evaluated in comparison to the control sample (TPS/PLA blend without HBP2-g-PLA). The torque value of the TPS/PLA blends with HBP2- g-PLA was lower than that of the control sample, while thermal stability and crystallinity followed opposite behavior. The glass transition temperature (Tg) and degree of crystallinity of the TPS/PLA blends with HBP2-g-PLA decreased with increasing mass fraction of HBP2-g-PLA. By scanning electron microscopy (SEM), it was observed that the morphology of the TPS/PLA blends with HBP2-g -PLA was more homogeneous than that of the control sample, confirming that HBP2- g-PLA acted as a compatibilizer and plasticizing agent to the TPS/PLA blends. Rheological analysis of the compatibilized TPS/PLA blends indicated the presence of microstructure.
Highlights
The environmental impact caused by conventional anhydride blends were prepared, non-biodegradable polymeric materials waste has created they exhibited poor interfacial adhesion, which was due the need to develop sustainable polymeric materials to the hydrophobicity of polylactic acid (PLA) and the hydrophilicity of from renewable resources, since alternative methods of starch-g-MA[10]
It is possibly attributed to a low proportion of the HBP2-g-PLA, which was employed during the preparation of this blend, since there is low interactions and rearrangement of the starch granules
The thermal stability of the tapioca starch (TPS)/PLA blends with HBP2-g-PLA did follow a trend with the proportion of HBP2-g-PLA employed
Summary
The environmental impact caused by conventional anhydride (starch-g-MA) blends were prepared, non-biodegradable polymeric materials waste has created they exhibited poor interfacial adhesion, which was due the need to develop sustainable polymeric materials to the hydrophobicity of PLA and the hydrophilicity of from renewable resources, since alternative methods of starch-g-MA[10]. PLA was blended with starch, plasticized recycling and disposal of non-biodegradable polymeric with glycerol, and the morphology of the materials obtained materials have not been fully effective[1,2]. The typically used plasticizing agents are hydrophilic. Some of these are urea, ethanolamine, glycerol and sorbitol[6]. The material obtained has poor mechanical properties as compared to polymers derived from petrochemical sources[1,6].
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