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Liquid star-shaped e-caprolactone (CL) oligomers were synthesized by ring-opening reaction of CL using a six terminal hydroxyl group initiator, Boltorn® H2004, for use as new plasticizers of poly(L-lactide) (PLA) films. The Boltorn-CL oligomers containing two and four units of CL on each oligomer arm were prepared. The PLA/oligomer blend films were prepared by solution blending before film casting. A phase separation led to the formation of plasticizer droplets. The CL arms reduced the phase separation. The plasticizer blending decreased slightly the Tg, Tc and Tm of the PLA films. The crystallinities of the PLA films increased with the Boltorn-CL blend ratio but they did not with the Boltorn® H2004. The Boltorn-CL blending improvedflexibility of the PLA films, but Boltorn® H2004 blending did not. The increasing of CL units decreased the flexibility of the PLA films. The Boltorn-CL oligomers could be used as plasticizers for PLA films.

Synthesis of Star-Shaped e-Caprolactone Oligomers for use as Plasticizers of Poly(L-Lactide) Bioplastic Films