Abstract：
Bionanocomposites offer a promising solution to the plastic waste crisis. Although tapioca starch shows potential as a bioplastic material, it is characterized by low mechanical properties, poor thermal stability, and high water absorption owing to its hydrophilic nature. To increase the flexibility of the material and reduce the transmission rate of oxygen and water vapor, additives such as fructose and titanium dioxide (TiO2) can be incorporated into the material. TiO2 nanoparticles are commonly utilized in agriculture to enhance nutrient release and promote plant growth. In this study, X-ray diffraction analysis revealed that TiO2 reduced crystal size while increasing the crystallinity of bionanocomposites. Fourier-transform infrared spectroscopy analysis revealed an absorption peak at 3397 cm-1, indicating hydrogen bonding between TiO2 and starch-OH groups, and a peak at 773 cm-1, indicating an increase in the intensity of Ti-O-Ti stretching vibrations with the incorporation of TiO2. Water absorption rate results confirmed that TiO2 addition enhanced bionanocomposite resistance to water vapor and moisture, evidenced by increased tensile strength from 0.11 to 0.49 MPa and Young\'s modulus from 2.48 to 5.26 MPa, as well as decreased elongation at break from 21.46 % to 2.36 % in bionanocomposites with TiO2. Furthermore, with TiO2 addition, the biodegradation rate of the bionanocomposites decreased, which is beneficial for enhancing plant nutrient content.
摘要：
生物复合材料为塑料废物危机提供了一个有希望的解决方案。尽管木薯淀粉显示出作为生物塑料材料的潜力，它的特点是机械性能低，热稳定性差，和高吸水性由于其亲水性。增加材料的柔韧性，降低氧气和水蒸气的透过率，例如果糖和二氧化钛(TiO2)的添加剂可以掺入到材料中。TiO2纳米颗粒通常用于农业中以增强养分释放并促进植物生长。在这项研究中,X射线衍射分析表明，TiO2降低了晶体尺寸，同时增加了生物纳米复合材料的结晶度。傅里叶变换红外光谱分析显示在3397cm-1处出现吸收峰，表明TiO2和淀粉-OH基团之间存在氢键，和773cm-1处的峰值，表明Ti-O-Ti拉伸振动的强度随着TiO2的掺入而增加。吸水率结果证实，TiO2的添加增强了生物复合材料对水蒸气和水分的抵抗力，拉伸强度从0.11增加到0.49MPa，杨氏模量从2.48增加到5.26MPa，在具有TiO2的生物纳米复合材料中，断裂伸长率从21.46％降低到2.36％。此外，添加TiO2，生物纳米复合材料的生物降解速率降低，有利于提高植物营养成分。
