科研之友
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摘要
Even if most superabsorbent polymers (SAP) used nowadays are synthetic, natural-based SAP hydrogels-have been gaining recently special attention due to their biocompatibility and degradability. The present manuscript studies the feasibility of obtaining hydrogels via soy protein functionalization using. ethylenediaminetetraacetic dianhydride (EDTAD) as COO- donor. The acylation of the protein was further confirmed by FTIR. Then, TGA tests and mainly the detertnination of the water imbibing capacity (WIC) of the modified protein samples related a higher extent of acylation reaction to a significant higher increase in the hydrophilic character of the soy protein. Using this functionalized protein as basis and glycerol as plasticizer (50 wt.%), bioplastics were obtained through small-scale injection molding. These samples displayed a water uptake capacity up to 2163 wt.% higher than that of the corresponding bioplastic based on the Unmodified protein used as a reference. This increase in water uptake was observed to be greater as the degree of functionalization was higher. Correspondingly, scanning electron microscopy (SEM) images corroborated that larger porous regions were developed in the acylated bioplastics. On regards to their mechanical properties, an increase in the functionalization degree led to SAP materials with lower Young's Modulus and higher extensibility than those of the reference sample. These results prove the potential of natural ingredients as proteins in the formulation of hydrogel that might overcome environmental issues related to the non-biodegradability of those based on acrylic derivatives.
- 出版日期2016-12
