聚乙烯醇缩丁醛/纳米TiO_2原位法复合材料的合成与性能

Synthesis and properties of PVB/nano-TiO_2 composites by in-situ method

主要研究了BA/PVA、纳米TiO2和催化剂及表面活性剂的用量、反应温度和时间等因素对原位复合材料膜性能的影响;采用原子力显微镜(AFM)对所制备的原位复合材料的结构、微观形貌进行了分析。结果表明,在PVB树脂合成阶段中引入纳米TiO2粒子,制得的原位复合材料的力学性能尤其韧性得到了明显提高。在TiO2相对PVB含量较低时(为3.6%),其断裂伸长率达到纯PVB的6倍左右。其优化合成条件为:TiO2用量为PVA量的6%,BA/PVA质量配比为0.65,催化剂用量为0.9%,表面活性剂用量为1%。

The effects of BA/PVA ratio, amount of nano-TiO2, chlorhydric acid and surfactant on the properties of the in-situ composites film were mainly investigated, and the microstructure, microcosmic morphology were studied by AFM. It was showed that the mechanical properties in especial the toughness of the composites were improved by adding nano-TiO2 before synthesizing of PVB, the elongation at break was increased by 6 times based on neat resin when the content of nano-TiO2 was lower（3. 6% based on PVB）. The optimum conditions were that TiO2 content was 6% based on PVA content, BA/PVA mass ratio was 0. 65, catalyst content was 0. 9%, surfactant content was 1% .