Poly(lactic acid-b-3-hydroxypropionic acid) block copolymer having excellent tensile strength and products containing the same
Provided is a poly(lactic acid-b-3-hydroxypropionic acid) block copolymer, in which various physical properties of polylactic acid, such as tensile strength, etc., are improved by introducing a 3-hydroxypropionic acid-derived monomer into polylactic acid, and thus the application fields in which the polylactic acid can be used is expanded.
1 . A poly(lactic acid-b-3-hydroxypropionic acid) block copolymer of the following Chemical Formula 1,
wherein a tensile strength of the poly(lactic acid-b-3-hydroxypropionic acid) block copolymer is 30 MPa or more, and
wherein a tensile modulus of the poly(lactic b-3-hydroxypropionic acid) block copolymer is 1.0 to GPa to 2.0 GPa:
wherein in Chemical Formula 1;
m is an integer of 100 to 1000;
n is an integer of 500 to 4000; and
m/n is 0.25 to 0.30.
2 . The poly(lactic acid-b-3-hydroxypropionic acid) block copolymer of claim 1 , wherein m is 250 to 650.
3 . The poly(lactic acid-b-3-hydroxypropionic acid) block copolymer of claim 1 , wherein n is 600 to 1400.
4 . The poly(lactic acid-b-3-hydroxypropionic acid) block copolymer of claim 1 , wherein the tensile strength of the poly(lactic acid-b-3-hydroxypropionic acid) block copolymer is 60 MPa or less.
5 . The poly(lactic acid-b-3-hydroxypropionic acid) block copolymer of claim 1 , wherein elongation of the poly(lactic acid-b-3-hydroxypropionic acid) block copolymer is 30% to 250%.
6 . The poly(lactic acid-b-3-hydroxypropionic acid) block copolymer of claim 1 , wherein a weight average molecular weight of the poly(lactic acid-b-3-hydroxypropionic acid) block copolymer is 50,000 to 350,000.
7 . The poly(lactic acid-b-3-hydroxypropionic acid) block copolymer of claim 1 , wherein a weight average molecular weight of the poly(lactic acid-b-3-hydroxypropionic acid) block copolymer is 130,000 to 170,000.
8 . An article comprising the poly(lactic acid-b-3-hydroxypropionic acid) block copolymer of claim 1 .