ABSTRACT

In the present study, the effects of partially water-soluble nanoscaled boron phosphate (BPO₄) on the mechanical properties of poly (vinyl alcohol) (PVA) plasticised with ethylene glycol films were investigated for the first time. Firstly, BPO₄ was synthesised at 500°C using boric acid and phosphoric acid as precursors. Then, nanoscaled BPO₄ was obtained by the ultrasonic homogenisation method. Finally, PVA/BPO₄ composite films were prepared by the solvent casting method with different BPO₄ weight ratios. As a result of mechanical studies of the composites, it was found that the tensile strength of pristine PVA was enhanced from 19.06 to 26.42 MPa with the addition of nanoscaled BPO₄. Furthermore, the tensile moduli of the composites reached their maximum at 4.56 GPa for the composite with 7% BPO₄ by weight. This indicates that BPO₄ is a promising material as an additive for low-cost composite films with high mechanical performances.

摘要

在本研究中，首次研究了部分水溶性纳米级磷酸硼 (BPO ₄ ) 对乙二醇薄膜增塑的聚乙烯醇 (PVA) 机械性能的影响。首先，以硼酸和磷酸为前驱体，在 500°C 下合成BPO ₄。然后，通过超声均质化方法获得纳米级BPO ₄。最后，采用溶剂浇铸法制备了不同BPO ₄重量比的PVA/BPO ₄复合薄膜。作为复合材料力学研究的结果，发现加入纳米级 BPO _{4 后}，原始 PVA 的拉伸强度从 19.06 MPa 提高到 26.42 MPa. 此外，对于含有 7% BPO ₄的复合材料，复合材料的拉伸模量在 4.56 GPa 时达到最大值。这表明 BPO ₄是一种很有前途的材料，可作为具有高机械性能的低成本复合薄膜的添加剂。