Method for surface modification of polyurethane material by graft copolymerization

A polyurethane material, graft modification technology, applied in the field of polymer materials and polymer chemistry, to achieve the effects of easier control of process parameters, simple operation and simple process

Inactive Publication Date: 2009-09-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a modification method with simple operation, easy control of process parameters and no need for expensive special equipment in view of the problems existing in the surface modification of the above-mentioned existing polyurethane materials

Method used

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  • Method for surface modification of polyurethane material by graft copolymerization

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Put 0.98g of potassium thiocyanate and 40mL of anhydrous acetonitrile in a 100mL reaction flask and stir to dissolve. 0.82 mL of acryloyl chloride was slowly dropped into the reaction bottle, and stirred at room temperature for 12 hours. The precipitate was removed by filtration. The filtrate was directly used in the next reaction. Put 60 polyurethane diaphragms (thickness 0.5 mm) with a diameter of about 5 mm in a reaction flask containing 30 mL of the above-mentioned filtrate, add 0.75 g of triethylamine to the reaction flask, stir and react at 65 ° C for 2 hours, and place the polyurethane diaphragm Take it out, wash with acetonitrile, and dry to obtain a polyurethane membrane with carbon-carbon double bonds on the surface. Place 0.028g of azobisisobutyronitrile, 2.26g of N-isopropylacrylamide, 15mL of methanol and 30 pieces of polyurethane diaphragms with carbon-carbon double bonds on the surface in a 50mL reaction bottle. Under nitrogen protection, the reaction m...

Embodiment 2

[0031] Put 0.98g of potassium thiocyanate and 40mL of anhydrous acetonitrile in a 100mL reaction flask and stir to dissolve. 0.82 mL of acryloyl chloride was slowly dropped into the reaction bottle, and stirred at room temperature for 12 hours. The precipitate was removed by filtration. The filtrate was directly used in the next reaction. Put 60 pieces of polyurethane diaphragms (thickness 0.5 mm) with a diameter of about 5 mm in a reaction flask containing 30 mL of the above filtrate, add 0.3 g of triethylamine to the reaction flask, stir and react at 65 ° C for 3 hours, and place the polyurethane diaphragms Take it out, wash with acetonitrile, and dry to obtain a polyurethane membrane with carbon-carbon double bonds on the surface. Place 0.028g of azobisisobutyronitrile, 2.6mL of (2-hydroxy) ethyl methacrylate, 15mL of methanol and 30 polyurethane diaphragms with carbon-carbon double bonds on the surface in a 50mL reaction bottle, under nitrogen protection , the reaction ...

Embodiment 3

[0033] Put 1.96g of potassium thiocyanate and 60mL of anhydrous acetonitrile in a 100mL reaction flask and stir to dissolve. Slowly drop 1.64 mL of acryloyl chloride into the reaction flask, and stir for 12 hours at room temperature. The precipitate was removed by filtration. The filtrate was directly used in the next reaction. Put 10g of polyurethane particles with a diameter of about 2mm in a reaction flask containing 40mL of the above filtrate, add 0.8g of triethylamine to the reaction flask, stir and react at 65°C for 4 hours, take out the polyurethane particles, wash with acetonitrile, and dry to obtain Polyurethane particles with carbon-carbon double bonds on the surface. Put 0.040g of dibenzoyl peroxide, 1.4mL of acrylic acid, 15mL of acetone and 8g of polyurethane particles with carbon-carbon double bonds on the surface into a 50mL reaction bottle, and under the protection of nitrogen, the reaction mixture was heated to 70°C with stirring And keep it warm for 3 hour...

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Abstract

The invention relates to the fields of high molecular materials and polymer chemistry and discloses a method for surface modification of a polyurethane material by graft copolymerization. The method comprises the following steps: chemically grafting polymerizable carbon-caron double bonds on the surface of the polyurethane material; and performing graft modification on the surface of the polyurethane material by graft copolymerization of free radicals in the presence of an initiator and vinyl monomers. The method is particularly characterized in that: the modification method has no severe requirements for appearance of the polyurethane material which can be solid polyurethane material taking a shape of granule, film, tube or rod or others; the modification method is a pure chemical method without needing expensive special equipment such as a plasma, an ozone generator and the like; the method has simple process and easily controlled process parameters; and the method has simple and practical operation and can conveniently modify physical and chemical properties of the surface of the polyurethane material.

Description

technical field [0001] The invention relates to the fields of polymer materials and polymer chemistry, in particular to a method for surface copolymerization and graft modification of polyurethane materials. Background technique [0002] Polyurethane (PU) has high tensile strength, good wear resistance, flex resistance and microbial resistance, making it widely used in the medical field and becoming the main material for the manufacture of artificial hearts, artificial blood vessels and medical catheters. one of the materials. However, due to its low surface energy and relatively low hydrophilicity, its blood compatibility is not ideal enough. When it is implanted into a living body as a foreign body, blood coagulation and thrombus may still occur. Therefore, functional modification of the surface of polyurethane to improve its surface biocompatibility has become an important measure to promote the application and development of polyurethane in the fields of medical materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/16C08L75/04
Inventor 陈红武照强刘小莉赵铁良
Owner WUHAN UNIV OF TECH
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