Electrospinning Process

Inactive Publication Date: 2008-06-19
PPG IND OHIO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0003]The present invention provides for a process of electrospinning a fiber from an electrically conductive solution of a polymer in the presence of an electric field between a spinneret and a ground source. The polymer undergoes a crosslinking reaction prior to and during the electrospinning process resulting in a viscosity buildup of the polymer solution enabling fiber formation and minimizing the use of thickeners.

Problems solved by technology

However, thickeners can adversely affect the properties of the resultant fibers and for this reason, their use should be minimized.

Method used

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  • Electrospinning Process
  • Electrospinning Process

Examples

Experimental program
Comparison scheme
Effect test

examples a

, B and C

Synthesis of Acrylic Silane Polymers

[0031]For each of Examples A to C in Table 1 below, a reaction flask was equipped with a stirrer, thermocouple, nitrogen inlet and a condenser. Charge A was then added and stirred with heat to reflux temperature (75° C.-80° C.) under nitrogen atmosphere. To the refluxing ethanol, charge B and charge C were simultaneously added over three hours. The reaction mixture was held at reflux condition for two hours. Charge D was then added over a period of 30 minutes. The reaction mixture was held at reflux condition for two hours and subsequently cooled to 30° C.

TABLE 1Example AExample BExample CCharge A (weight in grams)Ethanol SDA 40B1360.1 752.81440.2Charge B (weight in grams)Methyl Methacrylate12.8 41.8137.9Acrylic acid8.7 18.134.6Silquest A-1742101.4 211.9405.42-hydroxylethylmethacrylate14.5  0.30.64n-Butyl acrylate0.2  0.30.64Acrylamide7.2——Sartomer SR 3553— 30.3—Ethanol SDA 40B155.7 325.5622.6Charge C (weight in grams)Vazo 6746.1 12.824.5...

examples 1 , 2 and 3

EXAMPLES 1, 2 AND 3

Acrylic-Silane Nanofibers

Example 1

[0032]The acrylic-silane resin solution from Example C (8.5 grams) was blended with polyvinylpyrrolidone (0.2 grams) and water (1.5 grams). The formulation was stored at room temperature for 215 minutes. A portion of the resulting formulation was loaded into a 10 ml syringe and delivered via a syringe pump at a rate of 1.6 milliliters per hour to a spinneret (stainless steel tube 1 / 16-inch outer diameter and 0.010-inch internal diameter). This tube was connected to a grounding aluminum collector via a high voltage source to which about 21 kV potential was applied. The delivery tube and collector were encased in a box that allowed nitrogen purging to maintain a relative humidity of less than 25%. Ribbon shaped nanofibers having a thickness of about 100-200 nanometers and a width of 500-700 nanometers were collected on the grounded aluminum panels and were characterized by optical microscopy and scanning electron microscopy.

example 2

[0033]The acrylic-silane resin solution from Example B (8.5 grams) was blended with polyvinylpyrrolidone (0.1 grams) and water (1.5 grams). The formulation was stored at room temperature for 210 minutes. A portion of the resulting solution was loaded into a 10 ml syringe and delivered via a syringe pump at a rate of 0.2 milliliters per hour to the spinneret of Example 1. The conditions for electrospinning were as described in Example 1. Ribbon shaped nanofibers having a thickness of 100-200 nanometers and a width of 900-1200 nanometers were collected on grounded aluminum foil and were characterized by optical microscopy and scanning electron microscopy.

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Abstract

A method for electrospinning polymer fibers and the resultant electrospun fibers are disclosed. In the electrospinning method, the polymer undergoes a crosslinking reaction prior to and during the electrospinning process.

Description

FIELD OF THE INVENTION[0001]The present invention relates to an electrospinning process, the resulting electrospun fiber and polymers used in the electrospinning process.BACKGROUND OF THE INVENTION[0002]The process of electrospinning uses an electrical charge to form fine fibers. The process consists of a spinneret with a dispensing needle, a syringe pump, a power supply and a grounded collection device. Polymers in solution or as melts are located in the syringe and driven to the needle tip by the syringe pump where they form a droplet. When voltage is applied to the needle, a droplet is stretched to an electrified liquid jet. The jet is elongated continuously until it is deposited on the collector as a mat of fine fibers usually of nanometer-sized dimensions. The resultant fibers are useful in a wide variety of applications such as protective clothing, wound dressing and as supports or carriers for catalyst. To form a fiber, the polymeric melt or solution must have a sufficient vi...

Claims

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Application Information

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IPC IPC(8): D01F1/09D02G3/00D04H1/728
CPCD01D5/0038Y10T428/298D01F6/36D01D5/38D01D5/0053
InventorHELLRING, STUART D.RAGUNATHAN, KALIAPPA G.BALOG, KENNETH J.
OwnerPPG IND OHIO INC