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Polylactic-acid-based isotactic compound crosslinking copolymer and preparation method thereof

A technology of polylactic acid copolymer and cross-linked copolymer is applied in the field of polylactic acid-based stereocomposite cross-linked copolymer and its preparation, which can solve the problems of destroying the good degradability, toughness and thermal properties of polylactic acid, and improve the toughness. , the effect of expanding application fields and improving heat resistance

Active Publication Date: 2012-05-02
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects that the existing polylactic acid stereocomposite material preparation method will destroy the good degradability, toughness and thermal properties of polylactic acid, and provide a polylactic acid based stereocomplex cross-linked copolymer and its preparation method

Method used

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  • Polylactic-acid-based isotactic compound crosslinking copolymer and preparation method thereof
  • Polylactic-acid-based isotactic compound crosslinking copolymer and preparation method thereof
  • Polylactic-acid-based isotactic compound crosslinking copolymer and preparation method thereof

Examples

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Embodiment 1

[0050] (1) Add 5g of hyperbranched polyether, 12.5g of L-lactide, and 0.05g of zinc lactate into the polymerization tube, wherein the hyperbranched polyether uses trihydroxypropane as the initiator to initiate propylene oxide Prepared, the number average molecular weight is 5000; the optical purity of L-lactide is 96%ee. Filling with argon to catch up with oxygen, vacuuming, repeated three times, control the vacuum degree in the polymerization tube to be 10KPa, the temperature is 130°C, and react for 72 hours. The obtained product was purified, and its number average molecular weight was determined to be 16500.

[0051] (2) Weigh 16.5g of the prepolymer obtained in step (1) and 0.5g of stannous octoate, and dissolve them in 100ml of anhydrous toluene. Nitrogen was blown, and the reaction temperature was controlled at 50° C. for 4 hours. After the reaction, unreacted stannous octoate was removed by suction filtration, and vacuum-dried to obtain a terminal-modified three-branc...

Embodiment 2

[0062]Step (1) and step (2) are as shown in Example 1. Add the block copolymer obtained in step (2) and 25 g of D-lactide with an optical purity of 97% ee into the polymerization tube, and fill it with argon Catch oxygen, vacuum, repeat three times, control the vacuum in the polymerization tube to 5KPa, the temperature is 130°C, and react for 72 hours to obtain three-branched propylene oxide polyether-L-polylactic acid-D-polylactic acid stereotactic Composite cross-linked copolymer. The obtained product was purified, and its number average molecular weight was determined to be 35700. According to the method listed in Example 1, the mass ratio of tribranched propylene oxide polyether, L-polylactic acid, and D-polylactic acid in the block copolymer is measured to be 1:2:4; melting point is 195°C; elongation at break The rate is 198%; the deformation recovery rate is 97%, and the deformation fixation rate is 99%.

Embodiment 3

[0064] Step (1) and step (2) are as shown in Example 1. Add the block copolymer obtained in step (2) and 45 g of D-lactide with an optical purity of 97% ee into the polymerization tube, and fill it with argon Catch oxygen, vacuum, repeat three times, control the vacuum in the polymerization tube to 1KPa, the temperature is 130°C, and react for 72 hours to obtain three-branched propylene oxide polyether-L-polylactic acid-D-polylactic acid stereotactic Composite cross-linked copolymer. The obtained product was purified, and its number average molecular weight was determined to be 51,100. According to the method listed in Example 1, the mass ratio of tribranched propylene oxide polyether, L-polylactic acid, and D-polylactic acid in the block copolymer is measured to be 1:2:7; melting point is 192°C; elongation at break The rate is 112%; the deformation recovery rate is 95%, and the deformation fixation rate is 100%.

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Abstract

The invention belongs to the technical field of preparation of polylactic acid, and particularly relates to polylactic-acid-based isotactic compound crosslinking copolymer and a preparation method thereof. The copolymer is multi-branched polyether-D(L)-polylactic acid-L(D)-polylactic acid copolymer. The preparation method comprises the following steps: under the action of a catalyst, the multi-branched polyether introduces open-loop polymerization reaction of D-lactide or L-lactide and prepolymer is obtained; under the condition of no water or the protection of inert gases, the prepolymer reacts with end-group activating agent metallic carboxylate or metal alkoxide, and after drying, white solid is obtained; the white solid introduces open-loop polymerization reaction with the D-lactide or L-lactide; and the polylactic-acid-based isotactic compound crosslinking copolymer is obtained. The isotactic compound crosslinking copolymer can form a physical-crosslinking mesh structure, is endowed with a shape memory function of thermoplasticity of the material and has the advantages of high toughness and heat resistance and wide application prospect.

Description

technical field [0001] The invention relates to the technical field of polylactic acid preparation, and specifically relates to a polylactic acid-based stereocomplex cross-linked copolymer and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a polymer material with good biocompatibility and biodegradability, which belongs to thermoplastic aliphatic polyester. PLA is a biopolymer made of biomass resources, which gets rid of the dependence on petroleum resources; the environmental load caused by its manufacturing process is small; it has a series of advantages such as non-toxic, degradable, renewable, and compostable, and is in line with environmental protection. And the requirements of sustainable development, thus more and more attention of scientific researchers. [0003] PLA is glassy at room temperature, and has the highest rigidity among biodegradable polymers, but its heat resistance and toughness are poor, the heat distortion temper...

Claims

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Application Information

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IPC IPC(8): C08G63/664C08G63/80C08G63/91C08L67/04
Inventor 范仲勇赵辰阳石文鹏马燕李速明
Owner FUDAN UNIV
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