Conductive soy protein biocomposite plastics with high performance were fabricated with glycerol as plasticizer and nanosized carbon black (CB) as conductive filler. Adopting a pretreatment of the CB nanofiller, its dispersion, and interaction with matrix was improved. The results indicated the existence of strong hydrogen bonding between soy protein matrix and CB fillers, which improved the interfacial bonding. The strong interactions between CB and protein restricted the mobility of protein segments, resulting in a dramatical reinforcing effect for the CB filled composites and enhanced mechanical properties. Besides, the incorporation of CB into soy protein increased the thermal stability as well as the water resistance of the composites. Moreover, a low percolation threshold of 0.76 vol% and fine electrical conductivity were obtained for the bionanocomposites, resulting in improved electromagnetic interference shielding properties. This work provides a simple and green way for the preparation of conductive and electromagnetic interference shielding materials from natural polymers.

中文翻译：

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通过掺入纳米级炭黑，增强了大豆蛋白生物塑料的电和介电性能

以甘油为增塑剂，纳米炭黑（CB）为导电填料，制备了高性能的导电大豆蛋白生物复合塑料。通过对CB纳米填料的预处理，可以改善其分散性以及与基质的相互作用。结果表明，大豆蛋白基质和CB填料之间存在强氢键，从而改善了界面键合。CB和蛋白质之间的强相互作用限制了蛋白质片段的移动性，从而对CB填充的复合材料产生了戏剧性的增强作用，并增强了机械性能。此外，在大豆蛋白中掺入CB可以提高复合材料的热稳定性和耐水性。此外，低渗透阈值为0。该生物纳米复合材料获得了76％（体积）和优良的电导率，从而改善了电磁干扰屏蔽性能。这项工作为从天然聚合物制备导电和电磁干扰屏蔽材料提供了一种简单而绿色的方法。