Abstract
Welan gum modified polyurethane (WMP) with different welan gum concentrations were synthesized at vacuum conditions. The average pore diameter, porosity, pore volume, contact angle, pore morphology, oil adsorption ratio and absorption energy of WMPs were investigated by nitrogen adsorption analysis (NAA), scanning electron microscope (SEM), energy disperse spectroscopy (EDX), and molecular simulation. The results demonstrated that pore structure is highly dependent on the welan gum content. Moreover, the number of dead-end pores in the WMP decreased more compared to inter-connected, passing, and closed pores. Simulation results showed that the adsorption properties of WMP increased with the increasing welan gum content at a certain level. Welan gum could change the pore shape and improve the irregularity degree of WMP. The gel shrinkage also improves in spite of the hydrogen-bonding interactions. The two parameters of Langmuir isotherms are 42.68 mg g−1 and 0.0245 l mg−1, respectively. The gasoline adsorbability of WMP is smaller than that of diesel. Consequently, welan gum could improve the adsorption heat and the adsorbability of polyurethane.
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