Toughening of Poly(L-Lactide) by Polyester-Urethane Networks Based on Castor Oil-Modified Ɛ-Caprolactone Oligomers

Scientists from Japan conducted an experiment to increase the toughness of poly(L-lactide) (PLLA) with the help of polyester urethane networks obtained from castor oil based oligomers.  Hydroxy-terminated castor oil-modified ɛ-castor oilcaprolactone oligomers (CO-CLOns) were prepared by ring opening polymerizations of ɛ-caprolactone initiated with castor oil. It was then allowed to react with poly(L-lactide) which produced semi-interpenetrating polymer networks composed of TDI-bridged CO-CLOn networksand PLLA.

DSC analysis revealed that TCO-CLO10/PLLA 75/25 exhibited the highest tensile toughness compared to other polymer networks.