Biobased, Nonisocyanate, 2K Polyurethane Coatings Produced from Polycarbamate and Dialdehyde Cross-linking
Bioderived polycarbamates were cross-linked with petrochemically derived and biomass-derived dialdehydes to form nonisocyanate polyurethanes (NIPUs). The bioderived polycarbamates were synthesized from a soybean oil-derived alkyd polyol and epoxidized sucrose soyate polyol via transcarbamoylation. T...
Saved in:
Published in | ACS sustainable chemistry & engineering Vol. 7; no. 24; pp. 19621 - 19630 |
---|---|
Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
American Chemical Society
16.12.2019
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | Bioderived polycarbamates were cross-linked with petrochemically derived and biomass-derived dialdehydes to form nonisocyanate polyurethanes (NIPUs). The bioderived polycarbamates were synthesized from a soybean oil-derived alkyd polyol and epoxidized sucrose soyate polyol via transcarbamoylation. The polycarbamates were cross-linked with 1,4-cyclohexanedicarboxaldehyde and 2,5-diformylfuran (DFF) to form coatings under either laboratory ambient conditions or through an elevated temperature cure. The coatings were characterized spectroscopically, thermally, and via standard ASTM-coating characterizations. The coatings cured under ambient conditions had similar properties to those subjected to the elevated temperature cure. Ambient-cured coatings exhibited fast tack-free times, T g values from 67 to 96 °C, high hardness, and good solvent resistance; however, they were brittle and had poor adhesion on aluminum substrates. Coatings cured at elevated temperatures showed increases in T g values to 75–150 °C. Coatings on pretreated steel substrates had good adhesion. This study demonstrates the potential for bioderived DFF to function as a dialdehyde cross-linker to form NIPUs with bioderived carbamate functional resins resulting in a bioderived NIPU capable of ambient curing. Given the potential to form a multitude of aldehyde-functionalized furanic structures from 5-(hydroxymethyl)furfural, this increases the dialdehyde cross-linker options under consideration for formulation in bioderived NIPUs utilizing aldehyde-carbamate cross-linking. |
---|---|
ISSN: | 2168-0485 2168-0485 |
DOI: | 10.1021/acssuschemeng.9b04713 |