Poly(lactic acid) (PLA) is a biodegradable polymer that has been widely used in industrial applications. PLA
has high modulus and strength, but is brittle [1]. Blending with other polymers is commonly used to improve its
brittleness. Many studies on incorporation of both biodegradable and non-biodegradable polymer into PLA for
toughness improvement have been reported [2-5]. However, rubbers are always considered as the best candidate
for toughening [2,3,6]. Rubber phases dispersed in polymer matrix with most particle size less than 100 nm
significantly increased toughness of blends even at very small rubber content (