A kind of preparation method of polylactic acid modified material

Abstract

The invention discloses a preparation method of a polylactic acid modified material. The polylactic acid modified material is obtained by melt blending of a polyurethane elastomer containing poly-D-lactic acid and a poly-L-lactic acid matrix. A stereocomplex crystal is formed by the poly-D-lactic acid component on a molecular chain of the polyurethane elastomer and the poly-L-lactic acid matrix, the compatibility and interfacial interaction between two phases are improved, and the dispersion condition of the polyurethane elastomer in the poly-L-lactic acid matrix is greatly improved. The experimental results show that the toughness of the modified material is greatly improved, and the tensile strength is still maintained at a high level. The method is simple and easy to operate, is high incontrollability, can realize industrial production, and prepared composite materials are completely biodegradable and environmentally friendly.

Description

technical field

[0001] The invention belongs to the technical field of modification of degradable polymer materials, and in particular relates to a preparation method of polylactic acid modified materials.

[0002] technical background

[0003] Polylactic acid is a naturally degradable bio-based polymer, which is widely used in medical, industrial and food packaging industries due to its biocompatibility, biodegradability and excellent mechanical properties. However, polylactic acid materials still have the disadvantage of poor toughness, and it needs to be toughened and modified to meet the requirements for use as structural materials and expand its application fields.

[0004] Polylactic acid is a kind of chiral polymer. When L-polylactic acid and D-polylactic acid are mixed, stereocomplex crystals can be formed. Stereocomplex crystals are crystals in which molecular chains are regularly arranged, and the interaction force between molecular chains is very strong. The form...

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