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A solvent-free green method for preparing polylactic acid nanomaterials

A polylactic acid and nanoparticle technology, applied in the field of materials, can solve the problems of unsafety, high production cost, heat loss, etc., and achieve the effects of avoiding the use of toxic solvents, environmental protection and simple reaction process, and good environmental compatibility

Active Publication Date: 2021-11-26
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation methods of polylactic acid nanoporous materials mainly include sol-gel method, thermal decomposition method, supercritical foaming method, secondary deposition method, and electrochemical etching method (Ma Sude, Wang Yan, Zhong Lisheng. Polymer Kina Preparation methods and research progress of porous materials. New Chemical Materials, 2015,43(01):40-42.) These methods for preparing lactic acid nanoparticles and nanoporous materials require the use of a large amount of organic solvents (such as dichloromethane), Or consume a lot of heat energy, the method itself is not safe and environmentally friendly, and the preparation cost is high

Method used

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  • A solvent-free green method for preparing polylactic acid nanomaterials
  • A solvent-free green method for preparing polylactic acid nanomaterials
  • A solvent-free green method for preparing polylactic acid nanomaterials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Put 100g of lactide and 100g of polymerized rosin into a three-necked flask, and melt it for 30 minutes under nitrogen atmosphere at a temperature of 110°C and a stirrer rotation speed of 200r / min to obtain a uniformly mixed lactide-polymerized rosin blend thing. Continue to raise the temperature to 150°C, add stannous octoate with a lactide quality of 1‰, and keep the vacuum at -0.8Mpa at the same time, the stirrer speed is 500r / min, and the temperature is raised after the ring-opening polymerization of lactide for 3 hours The reaction was continued at 180°C for 1 hour to obtain polylactic acid nanoparticles coated with polymerized rosin. The coated rosin was washed with ethanol and freeze-dried to obtain polylactic acid nanoparticles with an average particle size of 205.06 nm and a PDI of 0.162.

Embodiment 2

[0040]Put 100g of lactide and 100g of polymerized rosin into a three-necked flask, and melt it for 30 minutes under nitrogen atmosphere at a temperature of 110°C and a stirrer rotation speed of 200r / min to obtain a uniformly mixed lactide-polymerized rosin blend things. Continue to raise the temperature to 150°C, add stannous octoate with a lactide quality of 1‰, and keep the vacuum at -0.8Mpa at the same time, the stirrer speed is 1000r / min, and the temperature is raised after lactide ring-opening polymerization for 3 hours The reaction was continued at 180°C for 1 hour to obtain polylactic acid nanoparticles coated with polymerized rosin. The coated rosin was washed with ethanol and freeze-dried to obtain polylactic acid nanoparticles with an average particle size of 199.02nm and a PDI of 0.173.

[0041] figure 1 SEM photo of the polylactic acid nanoparticles prepared in this example. The white particles in the photo are polylactic acid nanoparticles, the particle size ran...

Embodiment 3

[0046] Put 100g of lactide and 100g of polymerized rosin into a three-necked flask, and melt it for 30 minutes under nitrogen atmosphere at a temperature of 110°C and a stirrer rotation speed of 200r / min to obtain a uniformly mixed lactide-polymerized rosin blend things. Continue to raise the temperature to 150°C, add stannous octoate with a lactide quality of 1‰, and keep the vacuum at -0.8Mpa at the same time, the stirrer speed is 2000r / min, and the temperature is raised after lactide ring-opening polymerization for 3 hours The reaction was continued at 180°C for 1 hour to obtain polylactic acid nanoparticles coated with polymerized rosin. The coated rosin was washed with ethanol and freeze-dried to obtain polylactic acid nanoparticles with an average particle size of 178.61 nm and a PDI of 0.059.

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Abstract

The invention discloses a solvent-free green method for preparing polylactic acid nanomaterials, and belongs to the field of materials. In the present invention, the lactide, the catalyst and the polymerized rosin are mixed uniformly and then the ring-opening polymerization is carried out. The continuous phase dispersion polymerization method proposed by the present invention does not need to use organic solvents such as dichloromethane and chloroform as the reaction medium, and the cost of the raw materials used is low. low, and the preparation method is simple. The method makes the reaction efficiency of the lactide monomer in the ring-opening polymerization reaction high, the obtained polylactic acid nanoparticles have better surface morphology and stable particle size range, the pore size of the polylactic acid nanoporous material is uniform, and the whole reaction is efficient. Clean and green.

Description

technical field [0001] The invention relates to a solvent-free green method for preparing polylactic acid nanomaterials, belonging to the field of material technology. Background technique [0002] Polylactic acid is a biodegradable thermoplastic polyester prepared from starch in renewable plant resources (such as corn, potatoes, etc.). Its production process is green and environmentally friendly, and the final degradation products are carbon dioxide and water, which will not cause environmental pollution. The preparation of polylactic acid into various plastic products, partly replacing conventional non-degradable petroleum-based plastic products, is one of the important methods to solve the current severe plastic pollution. If polylactic acid is prepared as a microplastic particle with a particle size ranging from 5 μm to 1 mm, or a nanoporous material with a pore size ranging from 10 nm to 1 μm, polylactic acid nanoparticles can be used in the fields of drug sustained re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/08C08G63/78
CPCC08G63/08C08G63/78
Inventor 徐荷澜张林森侯秀良
Owner JIANGNAN UNIV