The Relationship between Rheological Properties and Morphology with Hydrophobicity of Inorganic Filler in Polylactic acid/Low-density Polyethylene Blends
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Among the biodegradable polymers, polylactic acid (PLA) is considered a promising material to solve the environmental pollution caused by plastic waste. However, PLA has weak mechanical properties such as brittleness and poor processability. For this reason, some researchers have tried polymer blend with materials that can compensate for the weaknesses of PLA[1]. In this study, low-density polyethylene (LDPE), which shows strain-hardening behavior in elongational viscosity, was used as the dispersed phase to overcome the disadvantage of PLA. To improve compatibility between PLA and LDPE, we added inorganic fillers, hydrophilic fumed silica, hydrophobic fumed silica, and hydrophilic organoclay as compatibilizers. Rheological tests and morphology were measured to evaluate the effect of various fillers in PLA/LDPE blends, and the relationship between rheological properties and morphology was investigated.