Incorporation of CO2-polyols into ester-based waterborne polyurethane: An effective strategy to improve overall performance
Amorphous structural CO 2 -polyol was used to modify ester-based water-borne polyurethanes (WPUs), resulting in improved low temperature film forming and comprehensive hydrolysis/oxidation resistance properties. Excellent intact films can be easily formed even at 3°C by adding 5% CO 2 -polyol into the ester-based WPUs (namely PU 5 CO 2 ). Moreover, WPUs modified by CO 2 -polyol show superior hydrolysis/oxidation resistance properties than that of control samples based on castor oil or poly(propylene oxide) glycol. PU 5 CO 2 showed significantly enhanced retention tensile strength from 40% to 68.2% than that of pure ester-based WPU after 5 h immersion in 1.5% NaOH solution, indicating an improved hydrolysis resistance. In addition, the PU 5 CO 2 displayed boosted oxidation resistance property with retention strength increased from 39% to 65%. Notably, the all-around aging resistance of ester-based WPUs intensified with an increase of CO 2 -polyol content. This work indicates that the CO 2 -polyol may be a promising modified material to improve comprehensive hydrolysis/oxidation resistance and low temperature film forming for ester-based WPUs.
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