Felix Manuel, Romero Alberto, Cordobes Felipe, Guerrero Antonio
Departamento de Ingeniería Química, Universidad de Sevilla, Facultad de Química, 41012, Seville, Spain.
J Sci Food Agric. 2015 Mar 15;95(4):679-87. doi: 10.1002/jsfa.6747. Epub 2014 Jun 25.
Protein has been investigated as a source for biodegradable polymeric materials. This work evaluates the development of plastic materials based on crayfish and glycerol blends, processed by injection moulding, as a fully biodegradable alternative to conventional polymer-based plastics. The effect of different additives, namely sodium sulfite or bisulfite as reducing agents, urea as denaturing agent and L-cysteine as cross-linking agent, is also analysed.
The incorporation of any additive always yields an increase in energy efficiency at the mixing stage, but its effect on the mechanical properties of the bioplastics is not so clear, and even dampened. The additive developing a greater effect is L-cysteine, showing higher Young's modulus values and exhibiting a remnant thermosetting potential. Thus, processing at higher temperature yields a remarkable increase in extensibility.
This work illustrates the feasibility of crayfish-based green biodegradable plastics, thereby contributing to the search for potential value-added applications for this by-product.
蛋白质已被研究作为可生物降解聚合物材料的来源。本研究评估了基于小龙虾和甘油共混物、通过注塑加工制成的塑料材料的开发情况，作为传统聚合物基塑料的完全可生物降解替代品。还分析了不同添加剂的影响，即作为还原剂的亚硫酸钠或亚硫酸氢钠、作为变性剂的尿素以及作为交联剂的L-半胱氨酸。
在混合阶段，添加任何添加剂都会提高能量效率，但其对生物塑料机械性能的影响并不明确，甚至会降低性能。影响较大的添加剂是L-半胱氨酸，其杨氏模量值更高，并具有残余的热固性潜力。因此，在较高温度下加工可显著提高延展性。
本研究说明了基于小龙虾的绿色可生物降解塑料的可行性，从而有助于探索这种副产品的潜在增值应用。
