Polarity of polymers
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Are all polymers non-polar? Can those types of polymers be used in coatings, and do they provide good adhesion to steel? Thank you
Epoxy is the top choice for good adhesion to steel
Some are polar, such as PVA, etc
Polymers are polar, and this polarity is not manifested in the main chain but rather in the side chains or functional groups. Non-polar polymers generally have poor adhesion to metals and require the use of adhesives, while polar polymers exhibit better adhesion to metals. If used as coatings for steel, the materials commonly available on the market include epoxy resins, polyurethanes, chlorinated rubbers, and chlorosulfonated polyethylene, among others.
Yes, what was said on the 5th floor is correct; the key lies in the molecules. For example, polyethylene has symmetric monomers and is non-polar, polypropylene is weakly polar, while PVC is highly polar due to the presence of halogens! Polymers with strongly polar groups such as carboxylic acids generally bond well to metals
The polarity of polymers is primarily manifested through side groups or functional groups, as in typical materials such as PVC, PAN, and PA
Polymers can also be divided into polar and non-polar types; however, compared to inorganic substances, their polarity is lower. To give specific examples: butyl acrylate cyanate adhesives, polyurea-based adhesives that enhance the toughness of epoxy resins, and silicone-modified epoxy-phenol resins suitable for high-temperature applications – there are many such adhesives
Epoxy resin is the best for coatings on steel surfaces, and it also provides good corrosion protection