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Method for preparing polylactic acid-zinc sulfide nano composite material

A nano-composite material, zinc sulfide technology, applied in the direction of zinc sulfide, etc., can solve the problems of bringing in impurities, purification treatment, loss of polylactic acid transparency, and restrictions on wide application, etc., to achieve good prospects for large-scale production, simple preparation method, good The effect of transparency

Inactive Publication Date: 2012-01-04
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few types of polylactic acid and inorganic nanocomposites, and the direct composite of nanoparticles and polylactic acid is the main method. The prepared composite materials often lose the transparency of polylactic acid, which limits its wide application.
There are many preparation methods for nano zinc sulfide (CN200910080996.0; 200610024420.9; 200810031121.7, etc.), but it is often necessary to add a dispersant or a surfactant to obtain better dispersed nano zinc sulfide particles, which also makes it compounded with polymers. Impurities or cause difficulties for subsequent purification

Method used

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  • Method for preparing polylactic acid-zinc sulfide nano composite material
  • Method for preparing polylactic acid-zinc sulfide nano composite material
  • Method for preparing polylactic acid-zinc sulfide nano composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Put 20g of lactide, 0.03g of stannous chloride, 0.46g of zinc acetate, 0.35g of carbon disulfide, and 9g of toluene into the autoclave. Nitrogen was introduced into the autoclave for 5 minutes to remove oxygen. Put it in an oven at 200°C, let it stand for 5 hours, then take it out and cool it with water, open the autoclave, pour the reaction solution into ethanol to precipitate, filter, wash the precipitate with ethanol for 5 times, and then filter with suction. °C in a vacuum oven for 24 hours to obtain polylactic acid-zinc sulfide nanocomposites.

[0017] The obtained polylactic acid-zinc sulfide nanocomposites have good dispersion, such as figure 1 As shown, the viscosity-average molecular weight of its polylactic acid is 500,000.

Embodiment 2

[0019] Add 12g of lactide, 0.1g of tetraphenylporphyrin aluminum alkoxylate, 5g of zinc nitrate, 4.5g of thiourea, and 20g of acetone in the autoclave, and feed nitrogen into the autoclave for 5 minutes to remove oxygen. Tighten the lid of the autoclave and place it in an oven at 120°C for 12 hours, then take it out and cool it with water, open the autoclave, pour the reaction solution into ethanol to precipitate, filter, wash the precipitate with ethanol for 5 times, and then filter with suction. The obtained powder was dried in a vacuum oven at 80° C. for 24 hours to obtain a polylactic acid-zinc sulfide nanocomposite material.

[0020] The obtained polylactic acid-zinc sulfide nanocomposite is dissolved in chloroform to obtain a transparent solution, such as figure 2 As shown, the viscosity-average molecular weight of its polylactic acid is 350,000.

Embodiment 3

[0022] Put 25g of lactide, 0.5g of alkyl aluminum, 8g of zinc naphthenate, 7g of sodium thiosulfate, and 15g of chloroform into the autoclave. Nitrogen was introduced into the autoclave for 5 minutes to remove oxygen. Tighten it and place it in an oven at 160°C for 8 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, then suction filter, and the powder obtained by suction filtration Dry in a vacuum oven at 80°C for 24 hours to obtain a polylactic acid-zinc sulfide nanocomposite material.

[0023] The obtained polylactic acid-zinc sulfide nanocomposite material can emit light at 365 nanometers when excited at a wavelength of 300 nanometers, and the viscosity-average molecular weight of the polylactic acid is 420,000.

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Abstract

The invention provides a method for preparing a polylactic acid-zinc sulfide nano composite material. The method comprises the following steps of: in a high-pressure reaction kettle, putting lactide, a catalyst, zinc salt, a sulfur source and a solvent according to a certain ratio, and controlling the reaction temperature and time, and reacting the mixed solution in a high-temperature sealed system to ensure that the monomer, the catalyst, the zinc salt, the sulfur source and the solvent are fully contacted and do not volatilize so as to completely react; and precipitating, filtering and drying the reaction solution so as to prepare the polylactic acid-zinc sulfide nano composite material. The preparation of nano zinc sulfide and polymerization of the polylactic acid are completed in one step, the prepared polylactic acid-zinc sulfide nano composite material is transparent and has ultraviolet-resistant and photoluminescence characteristics, and the molecular weight of the polylactic acid is high. The amount of the solvent used in the reaction process is relatively small, the reaction condition is mild, and the preparation method is simple and has good scale production prospect.

Description

technical field [0001] The invention relates to a preparation method of a polylactic acid-zinc sulfide nanocomposite material, in particular to a novel method for in-situ preparation of nanometer zinc sulfide during ring-opening polymerization of lactide by adopting a solvothermal synthesis method in an autoclave. The invention belongs to the technical field of composite materials. Background technique [0002] Polylactic acid is obtained by fermentation or chemical synthesis of starch extracted from renewable plant resources such as corn and potatoes. It has good biocompatibility, biodegradability, easy processing, non-toxic and non-irritating, etc. , its renewability and degradability are effective means to solve the current environmental and resource problems, so it has received extensive attention, especially in biomedical fields such as surgical sutures, fracture internal fixation, drug controlled release systems, and tissue engineering scaffold materials. Wide range o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/08C08G63/78C01G9/08C08L67/04C08K3/30
Inventor 戚嵘嵘肖春韵叶丹丹陆佳琦刘建美
Owner SHANGHAI JIAOTONG UNIV