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Preparation method for polylactic acid-ferroferric oxide nanometer composite materials

A nano-composite material, ferric oxide technology, applied in the field of composite materials, can solve problems such as difficult control and complicated reaction process, and achieve the effect of good superparamagnetism, simple preparation method and mild reaction conditions

Inactive Publication Date: 2013-08-07
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the existing polylactic acid-ferric oxide nanocomposite method reaction process complex, and not easy to control the deficiencies, to provide a new polylactic acid-ferric oxide nanocomposite preparation method, The prepared nanocomposites have good functional properties such as superparamagnetism, the method is simple, the reaction conditions are mild, and it is convenient for large-scale production

Method used

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  • Preparation method for polylactic acid-ferroferric oxide nanometer composite materials
  • Preparation method for polylactic acid-ferroferric oxide nanometer composite materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The first step, put into 5g nano iron ferric oxide (particle size is 20nm), 5g gamma-(methacryloyl oxygen) propyl trimethoxysilane, 40g ethanol in the autoclave, pass into nitrogen in the autoclave to Remove oxygen, tighten the lid of the autoclave and place it in an oven at 160°C for 6 hours, then take it out to cool naturally, wash with ethanol, centrifuge, and dry the centrifuged powder in a vacuum oven at 60°C for 36 hours to obtain the modified nanometer ferric oxide. In the second step, put 20g lactide, 0.06g stannous chloride, 1g modified nano ferric oxide, 7.5g toluene in the autoclave, feed nitrogen into the autoclave for 5 minutes to remove oxygen, Tighten the lid of the autoclave and place it in an oven at 200°C for 5 hours, then take it out and cool it with water, open the autoclave, pour the reaction solution into ethanol for precipitation and filter, wash the precipitate with ethanol for 5 times, and then filter with suction. The powder obtained by filter...

Embodiment 2

[0033]The first step, put into 8g nano iron ferric oxide (particle size is 50nm), 0.5g vinyltrimethoxysilane, 1g acetic acid aqueous solution, 15g methyl alcohol in the autoclave, feed nitrogen in the autoclave for 5 minutes to remove Oxygen, tighten the lid of the autoclave and place it in an oven at 180°C for 3 hours, then take it out to cool naturally, wash with methanol, centrifuge, and dry the centrifuged powder in a vacuum oven at 70°C for 28 hours to obtain the modified Nano ferric oxide. In the second step, 10g of lactide, 0.02g of tetraphenylporphyrin aluminum alkoxy compound, 0.48g of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl ) propionic acid] pentaerythritol ester, 8g modified nano iron ferric oxide, 21.5g acetone, feed nitrogen into the autoclave for 5 minutes to remove oxygen, tighten the lid of the autoclave and put it into an oven at 180°C for 8 hours , then take it out to cool with water, open the autoclave, pour the reaction solution into ethanol to preci...

Embodiment 3

[0035] In the first step, put 22g nanometer iron ferric oxide (particle size is 150nm), 3g gamma-glycidyl etheroxypropyl trimethoxysilane, 5g n-butyl titanate, 4g hydrochloric acid aqueous solution, 6g iso Propanol, put nitrogen into the autoclave for 5 minutes to remove oxygen, tighten the lid of the autoclave and place it in an oven at 80°C for 8 hours, then take it out to cool naturally, wash with ethanol, and centrifuge. °C in a vacuum oven for 20 hours to obtain the modified nanometer ferric oxide. In the second step, put 13.2g lactide, 0.4g aryl tin (quaternary), 1g bis(2,2,6,6-tetramethyl-4-sebacate, 1g Tris[2.4-di-tert-butylphenyl] phosphite, 0.4g modified nano ferric oxide, 24g cyclohexanone, feed nitrogen into the autoclave for 5 minutes to remove oxygen, tighten the lid of the autoclave Put it into an oven at 120°C, let it stand for 12 hours, then take it out and cool it with water, open the autoclave, pour the reaction solution into ethanol to precipitate, filter,...

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Abstract

The invention provides a preparation method for polylactic acid-ferroferric oxide nanometer composite materials. In a high pressure reactor, modified nanometer ferroferric oxide is obtained firstly, lactide, a catalyst, the modified nanometer ferroferric oxide and solvent are added proportionally, reaction temperature and reaction time are controlled to enable mixed solution to be reacted in a high-temperature airtight system, monomer, the catalyst, nanometer particles and the solvent are contacted fully and cannot volatilize so as to enable reaction to be completely, and reaction solution isprecipitated, filtered and dried to obtain the polylactic acid-ferroferric oxide nanometer composite materials. The obtained polylactic acid-ferroferric oxide nanometer composite materials have good dispersity and superparamagetism, and the preparation method is temperate in reaction conditions and simple and has good large-scale production prospect.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a method for preparing polylactic acid-ferric iron tetroxide nanocomposite materials by using a solvothermal synthesis method in an autoclave. Background technique [0002] PLA is extracted from starch-containing crops such as corn, and fermented to obtain lactic acid, which is then prepared by one of three methods: polycondensation, azeotropic dehydrogenation condensation, or lactide ring-opening polymerization. Under the condition of waste composting, PLA can be eventually directly degrades to CO 2 and H 2 O, it has the advantages of good biocompatibility, bioabsorption, degradability, non-toxic and non-irritating, sustainable, etc., so it has received extensive attention, especially in surgical sutures, fracture internal fixation, drug controlled release systems And biomedical fields such as tissue engineering scaffold materials have a wide range of applications....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/08C08K9/04C08K3/22C08L67/04
Inventor 叶丹丹戚嵘嵘陆佳琦罗宇胡新利
Owner SHANGHAI JIAOTONG UNIV