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Preparation method of block copolymer

A technology of block copolymer and ring-opening polymerization, applied in the field of preparation of block copolymer, can solve the problems of low tensile strength, reduced tensile strength of compound or block copolymer, unable to maintain crystallinity, etc., to achieve excellent The effect of mechanical properties, maintaining environmental friendliness and biodegradability

Active Publication Date: 2021-04-20
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the case of PBS and PBAT, there is a problem of low tensile strength, and the tensile strength of the compound or block copolymer is also reduced
[0007] In addition, attempts have been made in the related art to form biodegradable copolymers of polyhydroxyalkanoate (PHA) and polylactic acid, but there is a problem that the crystallinity cannot be maintained, and therefore, the tensile strength decreases instead.

Method used

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  • Preparation method of block copolymer
  • Preparation method of block copolymer
  • Preparation method of block copolymer

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Experimental program
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Embodiment 1 to Embodiment 4

[0052] (1) Preparation of poly(3-hydroxypropionate) oligomer

[0053] 7 g (77.71 mmol) of 3-hydroxypropionate were dried and polycondensed at a temperature of 130 °C for 24 hours in the presence of p-toluenesulfonic acid (p-TSA) catalyst to prepare poly(3-hydroxypropionate )Oligomer.

[0054] The weight average molecular weight of the prepared poly(3-hydroxypropionate) oligomer was 2,430.

[0055] (2) Preparation of polylactide-poly(3-hydroxypropionate) block copolymer

[0056] To a 500 mL round bottom flask was added L-lactide, poly(3-hydroxypropionate) oligomer and tin(II) 2-ethylhexanoate in the amounts shown in Table 1 below, and Vacuum was applied and vacuum dried at room temperature for 4 hours.

[0057] Subsequently, the flask was placed in an oil bath preheated at 130° C., its temperature was raised to 180° C., and then ring-opening polymerization was performed for 2 minutes to 30 minutes. After the reaction was completed, the reaction product was dissolved in chlo...

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Abstract

The present disclosure relates to a method for preparing a block copolymer. The method comprises ring-opening polymerizing a lactide monomer in the presence of a poly (3-hydroxypropionate) initiator to prepare a polylactide poly (3-hydroxypropionate) block copolymer.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims Korean Patent Application No. 10-2019-0034613 filed with the Korean Intellectual Property Office on March 26, 2019 and Korean Patent Application No. 10-2020 filed with the Korean Intellectual Property Office on March 16, 2020 -0031968, the disclosures of both patent applications are hereby incorporated by reference in their entirety. [0003] The disclosure relates to a preparation method of polylactide-poly(3-hydroxypropionate) block copolymer. Background technique [0004] Polylactide (or polylactic acid) resin is a plant-derived resin obtained from plants such as corn, and has attracted attention as an environmentally friendly material having excellent tensile strength and elastic modulus while having biodegradable properties. Specifically, polylactide (or polylactic acid) resins have the effect of preventing depletion of petroleum resources and suppressing carbon dioxide e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/08C08G63/82C08G63/85
CPCC08G63/08C08G63/85Y02W90/10C08G63/823
Inventor 崔祯允许成云金喆雄
Owner LG CHEM LTD