PREPARATION AND STUDY OF MECHANICAL PROPERTIES OF POLYLACTIC ACID/STARCH OLEATES BLENDS

Abstract In presented work, the blends composed from pure polylactic acid (PLA) and starch oleates were examined. Starch oleates (SO) with different degree of substitution (DS) were prepared by esterification of native starch and oleoyl chloride in heterogeneous conditions (pyridine). These prepared starch esters were used in the function of additives for preparation of blends with PLA. The PLA/starch oleates blends (9:1) have been prepared and evaluated by using attenuated total reflectance (ATR) spectroscopy technique. Subsequently, their mechanical properties, such as storage modulus (E'), loss modulus (E'') and tan D were studied as a function of temperature by dynamic mechanical thermal analysis (DMTA). These blends containing 10 wt. % SO show satisfactory mechanical properties in comparison to pure PLA