Abstract
Highly porous poly (acrylic acid) (P(AA)) with tunable pore structure was prepared through polymerizing of acrylic acid in the aqueous phase of an oil-in-water (O/W) high internal phase emulsion (HIPE). Compared with the conventional O/W HIPE normally using toluene or hexane as internal phase, the introducing paraffin, which have a much higher viscosity than toluene or hexane, caused the HIPEs herein could be stabilized by Tween 60 of low to 0.5 wt%. It was found the amount of liquid paraffin played a key role for the stability of the emulsion and the morphology of the resulting porous materials. Moreover, the average void size and the interconnectivity degree of the porous materials could also be tailored by altering the acrylic acid and surfactant concentration in aqueous phase.
Highlights
High internal phase emulsion (HIPE) is defined as the droplets phase in the emulsion volume fraction is higher than 74.05%
Polymerized high internal phase emulsion, or PolyHIPEs, is the material resulting from the polymerization of HIPE continuous phase
A series of porous PAA were prepared with o/w HIPEs that was stabilized with the surfactant (Tween 60) low to 0.5 wt%
Summary
High internal phase emulsion (HIPE) is defined as the droplets (internal) phase in the emulsion volume fraction is higher than 74.05%. Polymerized high internal phase emulsion, or PolyHIPEs, is the material resulting from the polymerization of HIPE continuous phase. In traditional HIPE, the concentration of surfactant is always very high, normally 5-50% relative to the continuous phase, which is not environmental friendly and is the most cost factor. Porous poly (acrylic acid) (PAA) from oil-in-water (O/W) HIPE with the concentration of surfactant up to 21wt% was prepared[2]. Polymerizing acrylic acid in these HIPE, a series of PAA were obtained.
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