The replacement of plastic materials derived from petroleum derivatives by highly biodegradable materials has been pursued to counteract the global environmental damage caused by their accumulated landfilling. In this sense, the feasibility of a soy protein isolate (SPI) to obtain processed materials has been extensively documented. In the present study, the characterization of injection moulded soy protein-based materials with different SPI/glycerol ratios (50/50, 55/45 and 60/40) has been carried out for different processing conditions of pressure (250, 500, 1000 bar) and temperature (80, 100, 120 °C). This characterization was performed in terms of their viscoelastic and tensile properties, water uptake capacity and soluble mater loss. An increase on the mechanical and viscoelastic properties was denoted when the protein content was higher, which could be related to an enhancement of interactions due to a greater proximity between chains. Similar effects were observed when the injection pressure was increased, eventually achieving a remarkable elongation at break value of 2, 7500% when processed at 1000 bar. Moreover, mould temperature was detected to be the most influential parameter on their water uptake capacity, resulting in a hindering of these parameter as higher temperatures were used. The effect of pressure on water uptake of these materials was opposite and milder to that found for temperature.

一直致力于用高度可生物降解的材料代替石油衍生物衍生的塑料材料，以抵消其累积的填埋对全球环境造成的破坏。从这个意义上讲，大豆蛋白分离物（SPI）获得加工原料的可行性已得到广泛的证明。在本研究中，已经针对不同的压力加工条件（250、500、1000）对具有不同SPI /甘油比（50 / 50、55 / 45和60/40）的注射成型大豆蛋白基材料进行了表征。 bar）和温度（80，100，120°C）。根据其粘弹性和拉伸性能，吸水能力和可溶性物质损失进行表征。当蛋白质含量较高时，表明机械和粘弹性性能增加，这可能是由于链之间的距离更大而导致的互动增强。当增加注射压力时，观察到类似的效果，最终在1000 bar下加工时达到2的显着断裂伸长率7500％。而且，检测到模具温度是对其吸水能力最有影响的参数，导致当使用较高温度时阻碍了这些参数。压力对这些材料的吸水率的影响与温度相反，且较温和。检测到模具温度是对其吸水能力影响最大的参数，由于使用了较高的温度，导致这些参数受到阻碍。压力对这些材料的吸水率的影响与温度相反，且较温和。检测到模具温度是对其吸水能力影响最大的参数，由于使用了较高的温度，导致这些参数受到阻碍。压力对这些材料的吸水率的影响与温度相反，且较温和。