摘要
聚乳酸是广泛应用于3D打印的耗材,针对其强度低及韧性差的力学性能缺陷,研究了一种聚乳酸/纳米二氧化钛复合材料的制备方法。首先以四氯化钛为钛源采用水热法制备纳米二氧化钛,再将纳米二氧化钛与聚乳酸熔融混合挤出制备聚乳酸/纳米二氧化钛复合材料。实验通过改变水热条件得到两种不同形貌纳米二氧化钛,一种是球状结构和棱面结构混合的纳米TiO_2,另一种是单一球状结构的纳米TiO_2。复合材料的力学性能测试结果表明,在相同条件下,混合结构(棱面结构和球状结构)的纳米TiO_2比单一球状结构的纳米TiO_2能更好的提高聚乳酸/纳米二氧化钛复合材料的拉伸强度和断裂伸长率。当纳米TiO_2掺入量为1.5%时,两种复合材料的拉伸强度和断裂伸长率都达到最大值。采用常规的工艺参数,以小音箱为例,将复合材料进行3D打印测试,结果表明,所制备的两种复合材料均能满足3D打印的要求。
Polylactic acid （PLA） is widely used in 3D printing. Against the mechanical properties defects of low strength and poor tough- ness, a fabrication method of PLA/TiO2 composites was researched. First, the nano-TiO2 was prepared via a hydrothermal method with tetrachloride titanium as the sources of Ti. Then the PLA/nano-TiO2 composites were prepared by melt-mixing extruder with the prepared nano-TiO2 and PLA. The result shows that the nano-TiO2 composites with two different morphologies are obtained by changing the hydro- thermal conditions. One is a mixed structure of spherical and facets nano-TiO2, the other is a single nano-spherical structure of TiO2. The tests of the mechanical properties show that the improved tensile strength and the elongation at break of composites with mixed structure （ facets and spherical） TiO2 are better than those of the single nano-spherical TiO2. The tensile strength and elongation of the two compos- ites reach up to the maximum when the nano-TiO2 additive amount is 1.5%. Taking small speaker box as the example, the 3D printing test of the molded composites was conducted with conventional process parameters. The results show that the two composites can meet the property requirements of the 3D printing.
出处
《塑性工程学报》
CAS
CSCD
北大核心
2017年第3期219-224,共6页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(21541012)
广东省教育厅重点平台及科研项目(2016KTSCX075)
广东大学生科技创新培育项目(2016P020101)
