Study on the Toughening Performance of Polylactic Acid by P(LA-TMC)Copolymer
Polylactic acid(PLA)is a type of biodegradable polymer material,but it has drawbacks such as brittleness and poor high-temperature resistance in practical applications.The toughening of PLA with biodegradable polymers is the focus and trend of future research.P(LA-TMC)copolymer was synthesized by using lactide(L-LA)and trimethylene carbonate(TMC)as the reaction raw materials and stannous octanoate(Sn(Oct)2)as the catalyst,and then blended with PLA to prepare the film.The results show that P(LA-TMC)copolymer can toughen PLA.The number average mo-lecular weight of P(LA-TMC)is 70 715 g/mol.As the content of P(LA-TMC)increases,the glass transition tempera-ture and tensile strength of the modified film P(LA-TMC)/PLA gradually decrease,while the thermal stability and elongation at break gradually increase.The diffraction peaks of PLA films are becoming increasingly prominent.
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