TY - JOUR
T1 - A clear coat from a water soluble precursor
T2 - A bioinspired paint concept
AU - Yang, Juan
AU - Bos, Inge
AU - Pranger, Wim
AU - Stuiver, Anthonie
AU - Velders, Aldrik H.
AU - Cohen Stuart, Martien A.
AU - Kamperman, Marleen
N1 - Publisher Copyright:
© 2016 The Royal Society of Chemistry.
PY - 2016
Y1 - 2016
N2 - Traditional paints consist of hydrophobic polymers dissolved in hydrocarbons; they are appreciated for their rheological properties and the smooth and glossy films they form upon drying and crosslinking, but are now largely banned because of the hazards associated with the solvents. In terms of health, water borne paints based on colloidal resin dispersions are an improvement but these systems lack the rheological and film forming properties of traditional paints. We present here a bio-inspired alternative that combines the best of both worlds: a water soluble polymer that can crosslink by mild oxidation to a fully water resistant and adhesive coating. Using free radical polymerization, we copolymerized two water soluble monomers, namely borax-protected dopamine acrylamide (DAA-p) and 2-aminoethylmethacrylamide (AEMA) in various proportions. We determined the reactivity ratio of these monomers using an in situ1H NMR monitoring method and found values of 0.0 and 0.46 for DAA-p and AEMA, respectively. From this we conclude that in the polymers DAA-p pairs do not occur, while DAA-AEMA diads are relatively frequent. After removing the protective borax by hydrolysis, we obtain polymers which are soluble in water at low pH (pH 2) but which undergo rapid oxidative crosslinking when the catechol groups of DAA react with amines from AEMA. This leads to a water resistant, mildly hydrophobic film with a water/air contact angle of about 40 degrees which adheres well to glass substrates.
AB - Traditional paints consist of hydrophobic polymers dissolved in hydrocarbons; they are appreciated for their rheological properties and the smooth and glossy films they form upon drying and crosslinking, but are now largely banned because of the hazards associated with the solvents. In terms of health, water borne paints based on colloidal resin dispersions are an improvement but these systems lack the rheological and film forming properties of traditional paints. We present here a bio-inspired alternative that combines the best of both worlds: a water soluble polymer that can crosslink by mild oxidation to a fully water resistant and adhesive coating. Using free radical polymerization, we copolymerized two water soluble monomers, namely borax-protected dopamine acrylamide (DAA-p) and 2-aminoethylmethacrylamide (AEMA) in various proportions. We determined the reactivity ratio of these monomers using an in situ1H NMR monitoring method and found values of 0.0 and 0.46 for DAA-p and AEMA, respectively. From this we conclude that in the polymers DAA-p pairs do not occur, while DAA-AEMA diads are relatively frequent. After removing the protective borax by hydrolysis, we obtain polymers which are soluble in water at low pH (pH 2) but which undergo rapid oxidative crosslinking when the catechol groups of DAA react with amines from AEMA. This leads to a water resistant, mildly hydrophobic film with a water/air contact angle of about 40 degrees which adheres well to glass substrates.
UR - http://www.scopus.com/inward/record.url?scp=84967185927&partnerID=8YFLogxK
U2 - 10.1039/c5ta09437b
DO - 10.1039/c5ta09437b
M3 - Article
AN - SCOPUS:84967185927
SN - 2050-7488
VL - 4
SP - 6868
EP - 6877
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 18
ER -