Abstract: Provided is a novel branched poly(3-hydroxypropionic acid)polymer.

Abstract: Provided is a novel a copolymer with structures including a branched poly(3-hydroxypropionic acid) and a poly(lactic acid).

Abstract: Provided is a block copolymer of Formula 1: wherein in Formula 1: R1 and R2 are each independently hydrogen, N, O, S, or substituted or unsubstituted C1-20 alkyl: X1 and X2 are each independently a direct bond, —COO—, —NR?CO—, —(NR?)(COO)—, —R?NCONR?—, or —OCOO—, wherein the R's are each independently hydrogen or C1-20 alkyl; L is a direct bond, substituted or unsubstituted C1-10 alkylene, substituted or unsubstituted C6-60 arylene, or substituted or unsubstituted C2-60 heteroarylene containing one or more heteroatoms selected from the group consisting of N, O, and S; and n and m are each independently an integer of 1 to 10,000. The block copolymer has excellent mechanical properties along with environmental friendliness and biodegradability.

Abstract: The present invention relates to a novel 3-hydroxypropionate-lactate block copolymer [P(3HP-b-LA)], and a method for preparing same, and more specifically, provides a method for preparing a 3-hydroxypropionate-lactate block copolymer, and a 3-hydroxypropionate-lactate block copolymer produced thereby, the method comprising: a first culture step in which, by using recombinant E. coli improved so as to be incapable of biosynthesizing lactic acid, P(3HP) is biosynthesized at the early stage of culturing by having glycerol as a carbon source and through 3-hydroxypropionate-generating genes and an enhanced PHA synthase; and a second culture step in which P(3HP) production is inhibited by using a carbon catabolic repression system for selectively introducing only glucose into E.

Abstract: Provided is a method for preparing a block copolymer, the method comprising subjecting a lactide monomer to a ring-opening polymerization in the presence of a poly(3-hydroxypropionate) initiator to prepare a polylactide-poly(3-hydroxypropionate)block copolymer.

Abstract: Provided is a triblock copolymer comprising a poly(3-hydroxypropionate) block, and polylactide blocks bonded to both ends of the poly(3-hydroxypropionate) block. Also provided is a method for preparing a triblock copolymer by ring-opening polymerization of lactide monomers in the presence of a poly(3-hydroxypropionate) initiator having hydroxy groups at both ends.

Abstract: Provided is a lactic acid-based block copolymer which is biodegradable while having excellent mechanical properties.

Abstract: 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.

Abstract: Provided is a poly(lactic acid-b-3-hydroxypropionic acid) block copolymer in which transparency is improved by introducing a 3-hydroxypropionic acid-derived monomer into a polylactic acid, and thus its application field can be expanded.

Abstract: A biopolymer, which exists in a liquid phase at room temperature, a use thereof, and a preparation method therefor are provided.

Abstract: Provided is a copolymer comprising an irregularly arranged structure of a repeating unit of the following Chemical Formula 1 and a repeating unit of the following Chemical Formula 2, and a repeating unit of the following Chemical Formula 3 present at least at one end of the structure: and is characterized by having an improved elongation and also having a high weight average molecular weight while maintaining intrinsic properties of a polylactic acid. Also provided are methods of preparing the copolymer.

Abstract: Provided are a polylactate stereocomplex exhibiting excellent heat resistance and remarkably improved elongation characteristics while maintaining biodegradability, and a preparation method thereof.

Abstract: Provided is a biopolymer composition, a preparation method for the same, and a bioplastic using the same, the biopolymer composition comprising at least 83.5 weight% of a copolymer resin of lactic acid (LA) and 3- hydroxypropionate (3HP), an antioxidant, and a lubricant, and the composition having an elongation percentage of at least 90% but not greater than 500%.

Abstract: Provided is a method for preparing a block copolymer including a step of subjecting a lactide monomer to ring-opening polymerization in the presence of a biosynthesized poly(3-hydroxypropionate) initiator to prepare a polylactide-poly(3-hydroxypropionate) block copolymer.

Abstract: Provided is a lactic acid-based block copolymer which is biodegradable while having excellent mechanical properties.

Abstract: The present invention relates to a novel 3-hydroxypropionate-lactate block copolymer [P(3HP-b-LA)], and a method for preparing same, and more specifically, provides a method for preparing a 3-hydroxypropionate-lactate block copolymer, and a 3-hydroxypropionate-lactate block copolymer produced thereby, the method comprising: a first culture step in which, by using recombinant E. coli improved so as to be incapable of biosynthesizing lactic acid, P(3HP) is biosynthesized at the early stage of culturing by having glycerol as a carbon source and through 3-hydroxypropionate-generating genes and an enhanced PHA synthase; and a second culture step in which P(3HP) production is inhibited by using a carbon catabolic repression system for selectively introducing only glucose into E.

Abstract: Provided is a lactic acid-based block copolymer which is biodegradable while having excellent mechanical properties.

Abstract: Provided are a novel 3-hydroxypropionate-lactate block copolymer [P(3HP-b-LA)], and a method for preparing same, comprising: a) transforming a recombinant microorganism modified to be incapable of biosynthesizing lactic acid with a vector including a 3-hydroxypropionyl-CoA biosynthesis gene and a polyhydroxyalkanoate (PHA) synthetase gene, and a vector including a lactate biosynthesis gene and a gene of an enzyme that converts lactate to lactyl-CoA; (b) synthesizing poly(3-hydroxypropionate) (P(3HP)) by culturing the recombinant microorganism using a glycerol as a carbon source; and (c) inhibiting P(3HP) production by adding IPTG and glucose, and biosynthesizing polylactate (PLA) at the end of P(3HP) synthesized in step (b) by enabling the expression of a lactate biosynthesis enzyme and an enzyme that converts lactate to lactyl-CoA. Also provided is a recombinant microorganism produced in step a).

Abstract: Provided is a triblock copolymer comprising a poly(3-hydroxypropionate) block, and polylactide blocks bonded to both ends of the poly(3-hydroxypropionate) block. Also provided is a method for preparing a triblock copolymer by ring-opening polymerization of lactide monomers in the presence of a poly(3-hydroxypropionate) initiator having hydroxy groups at both ends.

Abstract: Provided are a method and apparatus for providing and using content advisory (CA) information on Internet contents. A method of providing CA information by using a CA information server, includes receiving a request for the CA information on a content, from an Internet Protocol television (IPTV); searching for CA information on the content; and transmitting the found CA information to the IPTV. A method of using CA information when an IPTV reproduces a content not having the CA information, according to the present invention, includes transmitting a request for CA information, to a CA information server; receiving the CA information from the CA information server; analyzing the CA information; and applying the CA information.