University of Massachusetts at Amherst and Pyran LLC
Lei Zheng is currently a graduate student working in Professor John Klier's group from University of Massachusetts at Amherst. Zheng has two years of experience in synthesizing emulsion polymers and now works on polyester and polycarbonate-based coatings.
Biomass-Derived Coatings Using Renewable, Low-cost 1,5-Pentanediol-Based Polyesters and Polycarbonates
Polyester polyols and polycarbonate polyols were prepared using a novel, low-cost, bio-based 1,5 pentanediol monomer (1,5-PDO) provided by Pyran LLC and formulated into solventborne thermoset coatings. The coating properties, such as pencil hardness, low-temperature flexibility, chemical resistance, thermal transition temperatures and adhesion strength on substrates were characterized and compared with incumbent 1,6-HDO or 1,5-PDO-based coatings. Renewable, low-cost 1,5-PDO-based coatings exhibited similar performance to the coatings based on petroleum-derived 1,6-HDO or 1,5-PDO, indicating potential to substitute low-cost renewable 1,5-PDO for chemically derived 1,5-PDO and 1,6-HDO, while maintaining excellent coating properties. We are currently collaborating with Pyran LLC to develop fully formulated coatings, such as solventborne thermoset coatings, thermoset powder coatings and waterborne polyurethane coatings, using the renewable 1,5-PDO-based polyesters or polycarbonates and characterizing the coatings with a full set of tests.