Polyurethane polymers are very successful products used in the adhesive, sealants and paint industries. The hydrogen bonds present in PU bond add strength to the polymer matrix and are able to reform during sealant elongation. They also form a bond with a plasticizer for good adhesion to the surface.
However, the unreacted isocyanate groups in uncured PU sealants and adhesives are very reactive and harmful to humans in various forms.
Fortunately, chemists have developed a very good polymer design where, the nasty NCO group is eliminated, by a silane molecule. It’s a new polymer class that formulators of sealant and membranes need to be aware of.
Read on to know more about silane-modified polymers.