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Efficient preparation method of high-strength and high-toughness degradable polyester polymer

A technology for degrading polyester and polymers, applied in the field of biodegradable materials, can solve the problems of high toughness and high strength, and achieve the effect of universality, high efficiency and practicability, and simple method

Active Publication Date: 2019-03-29
朱志荣 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the high toughness and high strength of degradable polyester polymers cannot have both

Method used

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  • Efficient preparation method of high-strength and high-toughness degradable polyester polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A high-efficiency preparation method for high-strength and high-toughness degradable polyester polymers is carried out according to the following steps:

[0022] Step 1: Melt 240 g of polylactic acid with a molecular weight of 200,000 in an internal mixer at 190°C, then add 1.8 g of Joncryl ADR-4370S, and blend for 15 minutes.

[0023] Step 2, the polylactic acid / Joncryl polymer obtained after the modification in step 1 is made into particles with a diameter of 1~3mm through a granulator, and then melted in a hot press under zero pressure for 5 minutes, and then melted under 5 MPa Hot pressing for 3 minutes, 15 MPa hot pressing for 2 minutes, and then cooling to 15 °C at a rate of 20 °C / min to finally obtain a polymer tensile standard test piece of about 3 mm.

[0024] In step 3, the obtained polymer samples were immediately transferred to a refrigerator at -40°C for 120 hours.

[0025] Step 4, transfer the frozen polymer sheet to an ultraviolet crosslinker for 30 hour...

Embodiment 2

[0027] A high-efficiency preparation method for high-strength and high-toughness degradable polyester polymers is carried out according to the following steps:

[0028] Step 1: Melt 240 g of polyglycolic acid with a molecular weight of 220,000 at 190°C in an internal mixer, then add 1.2 g of Joncryl ADR-4368C, and blend for 12 minutes.

[0029] Step 2, the polyglycolic acid / Joncryl polymer obtained after modification in step 1 is made into particles with a diameter of 1~3mm through a granulator, and then melted in a hot press under zero pressure for 5 minutes, and then 5 MPa Under hot pressing for 3 min, 15 MPa hot pressing for 2 min, and then cooling to 15 °C at a rate of 30 °C / min, finally obtain a polymer tensile standard test piece of about 3 mm.

[0030] In step 3, the obtained polymer samples were immediately transferred to a refrigerator at -25°C for 48 hours.

[0031] Step 4, transfer the frozen polymer sheet to an X-ray irradiator for 10 hours of radiation.

Embodiment 3

[0033] A high-efficiency preparation method for high-strength and high-toughness degradable polyester polymers is carried out according to the following steps:

[0034]Step 1: Melt 240 g of poly(lactic-co-glycolic acid) copolymer with a molecular weight of about 200,000 at 195°C in an internal mixer, and then add 2 g of poly(2-ethyl-2-oxo) with a molecular weight of 5,000 oxazoline), and the blending reaction was 17 min.

[0035] Step 2, the poly(lactic-co-glycolic acid) copolymer / poly(2-ethyl-2-oxazoline) polymer obtained after modification in step 1 is made into granules with a diameter of 1~3mm through a granulator, and then heated and pressed In the machine, melt at zero pressure for 5 minutes, then hot press at 5 MPa for 3 minutes, hot press at 15 MPa for 2 minutes, then cool to 15 °C at a rate of 30 °C / min, and finally obtain a polymer tensile standard test piece of about 3 mm Sample.

[0036] In step 3, the obtained polymer samples were immediately transferred to a re...

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Abstract

The invention discloses an efficient preparation method of a high-strength and high-toughness degradable polyester polymer, specifically comprising the following steps: adding an active chain extenderto a polymer system in advance, and realizing fusion of the chain extender and the polymer system and formation of a polymer chain branching and cross-linking structure in the polymer system throughhigh temperature treatment; realizing delay and reversibility of physical aging and structure relaxation process of a polymer through low temperature treatment; triggering physical aging of the activechain extender and linear polyester by radiation and simultaneously carrying out cross-linking and branching reaction to control the reforming, arrangement and folding of the polymer molecular chain,thereby increasing the entanglement density of an amorphous molecular chain in the polymer system and reducing the formation of a secondary ordered structure during the physical aging process. According to the degradable polyester polymer prepared by the above method, the original strength is kept, and toughness is greatly improved by 1-5 times. The method is of great significance for the actualprocessing and application of the degradable polyester polymer.

Description

technical field [0001] The invention belongs to the field of biodegradable materials, and relates to a high-efficiency preparation method of high-strength and high-toughness degradable polyester polymers. Background technique [0002] Biodegradable materials are a kind of natural or synthetic biomedical materials that can be continuously degraded in the biological body and absorbed by the body, or excreted from the body, and finally the implanted material is completely replaced by new tissue. Linear aliphatic polyesters such as polylactic acid, polyglycolic acid, polylactic acid-glycolic acid copolymer, etc., are widely used as biomedical materials for stents, Absorbable sutures, drug carriers, healing materials, adhesives, and repair materials for tissue defects. However, defects such as brittleness, low elongation at break, and poor toughness limit its application range. The introduction of flexible polyesters is a fast, effective and one of the most widely used methods ...

Claims

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Application Information

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IPC IPC(8): C08J7/12C08J7/00C08J3/24C08L67/04C08L79/02
CPCC08J3/24C08J3/246C08J7/00C08J7/123C08J2367/04C08J2479/02
Inventor 朱志荣赵国庆
Owner 朱志荣
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