Synthesis of Hydrophobic Corn Starch with High Flowability by Surface Modification
2009
Chujiang, Cai | Jinzhi, Li | Zhigang, Shen | Shulin, Ma | Yushan, Xing
A new particle design method was proposed for the production of hydrophobic corn starch with high flowability by surface modification. The flowability and hydrophobicity of the native and modified corn starches were investigated by wettability (activation index) and flowability experiments (flow time), scanning electron microscopy (SEM), and X-ray diffraction (XRD). In corn starch modification, the optimal modifying agent is a mixture of tetraisopropyldi(dioctylphosphate)titanate (NDZ-401) and methyl hydrogen silicone oil (H202), and the optimal content is 1% (w/w). The optimal content of flow agent (R972 silica) is 1% (w/w). The results indicate that the modified corn starch is a free flowing powder, which is also remarkably water repellent. The crystalline structures of the native and modified corn starches are similar, and only the surface properties are changed from hydrophilic to hydrophobic.
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