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Wednesday, 12 December 2018
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Raw materials & technologies, Technologies

Water-borne polyurethane/polyacrylate emulsions containing sulfonate groups

Thursday, 22 November 2018

Researchers recently focused on the production and characterisation of water-borne sulfonate group-containing polyurethane/polyacrylate emulsions.

The scientists produced polyurethane/polyacrylate emulsions (SDPUA) using carboxyl groups and sulfonate groups. Source: Leigh Prather – stock.adobe.com.
The scientists produced polyurethane/polyacrylate emulsions (SDPUA) using carboxyl groups and sulfonate groups. Source: Leigh Prather – stock.adobe...

Polyurethane/polyacrylate emulsions (SDPUA) with high solid content were obtained by using carboxyl groups and sulfonate groups as hydrophilic chain-extenders and internal emulsifiers through surfactant-free emulsion polymerisation. Polyurethane/polyacrylate emulsions with ethylene diamine (EDA) as chain-extender (EDPUA) were also prepared. The influence of the different 2,4-diamino-benzenesulfonic acid sodium salt (DABS) content on the properties of the SDPUA products was investigated. The main properties of EDPUA were also discussed compared with the SDPUA samples. Dynamic light scattering results showed that when DABS/DMPA molar ratios increased from 1/4.7 to 1/2.28, the particle size increased from 72.2 to 99.7 nm. The particle size of EDPUA emulsion was larger.

Enhancement of thermal stability

The steady rheological measurements illustrated that the viscosity decreased with the shear rate increase and the emulsions were displayed as pseudoplastic behavior. Attenuated total reflection Fourier transform infrared results demonstrated the SDPUA products were successfully prepared. As the function of DABS groups, the thermal stability was enhanced. With the increment in DABS/DMPA molar ratio, the contact angles on SDPUA membranes decreased, and the surface free energies increased. The T-peel strength increased to 88.2 N/mm and DABS/DMPA molar ratio increased to 1/2.28, and it was larger than the EDPUA samples. The compatibility of the dual phases was enhanced.

The study is published in: Journal of Coatings Technology and Research  November 2018, Volume 15, Issue 6, pp 1217–1227.

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