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Surebond Polymers Chemically Bond to Metal
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COR is a Biomedical Engineer, Chemical Engineer, Microbiologist, Scientist, Consultant in Chemistry, Polymer Chemistry, Surface Modification, Medical Research Specialist with world-class expertise in analytical techniques including Nuclear Magnetic Resonance, Fourier Transform Infrared Spectroscopy, Gel Permeation Chromatography, Electron Spectroscopy for Chemical Analysis, Differential Scanning Calorimetry, Contact Angle and Scanning Electron Microscope (EDS & WDS); Protein Radiolabeling and analysis
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From the paint industry to the medical industry, many companies have strived to produce a coating that could protect/disguise metal from environmental factors. One large issue in determining whether a coating will perform over the long term is that the coating must be very adherent to the underlying metal substrate. Manufacturers have had some success using processes like acid etchants or mechanical roughening of the metal to create a more three-dimensional surface for the polymer to adhere to. Others have used heated metal parts in an attempt to enhance the chemical reactivity of the metal surface to increase adhesion. Another type of process used with powder coatings has had successful adhesion, but mainly outside the medical field. In this process, fluidized polymer particles are gun sprayed onto the surface and heat cured at temperatures between 350-400 degrees F. However, the process is messy unless an electrostatic process is used. Also during the heat cure process most metals will outgas, which will cause pin holes in the coating. Lately, manufactures have begun using the 'Tie Layer' concept, which places a thin well adherent coating between the use coating and the metal. Parylene [poly(p-xylylene)] and coupling agents like organosilanes have been used for this purpose. Both Parylene and organosilanes have demonstrated successful adhesion to metal in a number of applications. It is thought that organosilanes form Metal-O-Si bonds at the metal surface and if the organic component of the silane contains the correct functional groups, it can chemically bind to the polymer overlayer. The down fall of organosilanes is that M-O-Si bond can be hydrolyzed and broken in a moist environment. The second type of coating, called Parylene can be termed a 'living polymer' that is converted directly from a gaseous monomer to a polymer film on the surface being coated. Polymer formation occurs sequentially on the growth interface and forms a linear polymer that has been deposited on the metal. Parylene conforms well to the part and has very little water vapor transmission . Parylene displays good adhesion to metals, however this author believes through internal studies that this is achieved through a mechanical bonding process.
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Read other articles by this KKAI Associate:
Evaluation of Surface Modified Polymer Valves In the Ovine Mitral Model
| Biomedical Engineer, Chemical Engineer, Microbiologist, Scientist, Consultant in Chemistry, Polymer Chemistry, Surface Modification, Medical Research Specialist, analytical techniques including Nuclear Magnetic Resonance, Fourier Transform Infrared Spectroscopy, Gel Permeation Chromatography, Electron Spectroscopy for Chemical Analysis, Differential Scanning Calorimetry, Contact Angle and Scanning Electron Microscope (EDS & WDS); Protein Radiolabeling and analysis | |
| Resume of CAW | chemist, biochemist, biomedical research expert consultant |
| Resume of KJE | high voltage maintenance, safety, expert consultant |
| Resume of HXG | energy dispersive spectroscopy (eds) expert consultant |
| Resume of HEE | pharmaceutical quality control, validation expert consultant |
| Resume of TUU | biochemist, macromolecular crystallography expert consultant |
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