Polylactic-acid block copolymer and preparation method thereof

A technology of block copolymer and polylactic acid, which is applied in the field of polylactic acid block copolymer and its preparation, to achieve the effects of good toughness, good processing performance and high tensile strength

Active Publication Date: 2009-09-02
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method obtains a thermoplastic elastomer with a relatively high elongation at break, its tensile strength is usually less than 2.0 MPa due to the randomness of its structure.

Method used

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  • Polylactic-acid block copolymer and preparation method thereof
  • Polylactic-acid block copolymer and preparation method thereof
  • Polylactic-acid block copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The hydroxyl-terminated polylactic acid prepolymer and polyethylene glycol ester diol with intrinsic viscosities of 0.09dL / g and 0.12dL / g were weighed in a weight ratio of 1:1 and placed in a reaction flask, Under the protection of nitrogen, heat up to 140°C, stir, melt and mix evenly, then add chain extender toluene diisocyanate in an amount of 8.9% of the total weight of the prepolymer, and react at 140°C for 20 minutes.

[0024]Using chloroform as a solvent for the obtained product, the intrinsic viscosity was measured at 25°C with an Ubbelohde viscometer to be 0.81dL / g; For the film, the mechanical properties of the film were measured according to GB / T1040-92. The tensile strength of the film was 20.35 MPa, and the elongation at break was 275%.

Embodiment 2

[0026] The hydroxyl-terminated polylactic acid prepolymer and polybutylene oxalate diol with intrinsic viscosities of 0.13dL / g and 0.17dL / g were weighed in a weight ratio of 1:1 and placed in a reaction flask, Under the protection of nitrogen, heat up to 160°C, stir, melt and mix evenly, then add chain extender hexamethylene diisocyanate in an amount of 5.3% of the total weight of the prepolymer, and react at 160°C for 30 minutes.

[0027] The obtained product was measured according to the method listed in Example 1. Its intrinsic viscosity was 1.39 dL / g; the tensile strength of the film was 27.35 MPa, and the elongation at break was 473%.

Embodiment 3

[0029] The hydroxyl-terminated polylactic acid prepolymer and polyhexamethylene adipate diol with intrinsic viscosities of 0.16dL / g and 0.21dL / g were weighed in a weight ratio of 1:1 and placed in a reaction flask, Under the protection of nitrogen, heat up to 160°C, stir, melt and mix evenly, then add chain extender toluene diisocyanate in an amount of 4.1% of the total weight of the prepolymer, and react at 160°C for 45 minutes.

[0030] The obtained product was measured according to the method listed in Example 1 to have an intrinsic viscosity of 1.35 dL / g; the tensile strength of the film was 28.49 MPa, and the elongation at break was 642%.

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Abstract

A polylactic acid block copolymer disclosed in the present invention is characterized in that the copolymer is composed of hydroxyl-terminated polylactic acid with an intrinsic viscosity of 0.05 to 0.5 dL / g and aliphatic polylactic acid with an intrinsic viscosity of 0.1 to 1.0 dL / g. Ester diol is prepared by melt reaction in the presence of chain extender diisocyanate. The intrinsic viscosity of the copolymer is 0.7-2.5dL / g, the tensile strength is 10-40MPa, and the elongation at break is 100-800 %. The invention also discloses a preparation method of the copolymer. Since the hydroxyl-terminated polylactic acid prepolymer used in the preparation of the copolymer of the present invention is prepared by melt polymerization, a series of problems caused by the ring-opening polymerization process are avoided, and the product is not only low in cost, but also has It has the advantages of good toughness, high tensile strength, high tensile elongation at break, and good processing performance, and it has laid the foundation for its use as a general-purpose polymer material. The method of the invention is simple, and the reaction is easy to control, so large-scale and continuous industrial production can be realized.

Description

technical field [0001] The invention belongs to the technical field of polylactic acid copolymerization modification, and in particular relates to a polylactic acid block copolymer and a preparation method thereof. Background technique [0002] At present, the development of general-purpose polymer materials is facing two major challenges: one is the price increase caused by the shortage of petroleum resources; the other is environmental pollution caused by refractory degradation. In order to solve these two problems, in recent years, the preparation of degradable polymer materials from renewable resources has become a hot topic of research by scholars at home and abroad. [0003] Polylactic acid is a renewable biodegradable material, which is usually prepared from lactic acid obtained from starch fermentation. They are non-toxic and harmless, and are known as promising biomedical materials. However, the earliest high-molecular-weight polylactic acid that can be used as a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/00C08G63/91C08K5/29
Inventor 王玉忠曾建兵丁颂东李以东杨科珂汪秀丽陈思翀周茜
Owner SICHUAN UNIV
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