Dispersion Characteristics and Curing Behaviour of Waterborne UV Crosslinkable Polyurethanes Based on Renewable Dimer Fatty Acid Polyesters
- 44 Downloads
In the last few years there has been a great deal of interest in modifying the methodologies for obtaining polyurethanes using more sustainable strategies. Following this tendency, in the present work, waterborne UV-curable polyurethanes were synthesized using commercially available dimer fatty acid based polyols obtained from renewable resources (Priplast from Croda). The polyols, characterized by proton nuclear magnetic resonance (1H NMR), differential scanning calorimetry (DSC) and size exclusion chromatography (GPC–SEC), were semicrystalline and presented very broad melting related with their complex molecular weight distribution. Different polyurethane dispersions were obtained by changing the percentage of the hard segment. Comparing with waterborne polyurethane dispersions obtained from non-renewable resources, the dispersions showed higher particle size even using similar or higher amounts of internal emulsifier. The curing behaviour was characterized by photo-differential scanning calorimetry (Photo-DSC) and the results showed that the conversion and polymerization rate decreased with the hard segment content and temperature. The obtained products displayed good thermal characteristics with phase-separated structures.
KeywordsWaterborne UV curable polyurethanes Dimer fatty polyester Renewable materials
The authors acknowledge the University of the Basque Country UPV/EHU (UFI 11/56), the Diputación Foral de Gipuzkoa (OF218) and, the Basque Government (Ayuda a grupos de investigación del sistema universitario vasco IT618-13) for the funding received to develop this work. Technical and Human support provided by Macrobehavior-Mesostructure-Nanotechnology and NMR SGiker services of UPV/EHU is also gratefully acknowledged.
- 1.Cheng HN, Gross NA, Smith PB (2015) ACS symposium series. American Chemical Society, Washington DCGoogle Scholar
- 24.Khanderay JC, Gite VV (2017) Green Mater 5:109Google Scholar
- 35.Zhang P, Zhang X, Dai J (2011) Polym Mater Sci Eng 10:23Google Scholar