功能化磷酸钛对PC阻燃和力学性能的影响

Effects of Functional Titanium Phosphate on Flame Retardancy and Mechanical Properties of Polycarbonate

成功制备了一种核-壳结构的磷酸钛阻燃剂(F-TiP),并通过熔融共混法将其添加到聚碳酸酯(PC)中。采用极限氧指数测试(LOI)、垂直燃烧试验(UL-94)、热重分析(TG)及拉伸测试等方法,分析了该复合材料的阻燃和力学性能。结果表明:核-壳结构磷酸钛阻燃剂的最优含量为6%,此时复合材料体系的LOI为32.7%,同时其达到了UL-94的V-0级别。由于F-TiP阻燃剂的存在,TG分析结果显示炭层成碳量增加,且SEM分析显示炭层结构更为致密,并发现磷酸钛核和功能化壳之间存在协同阻燃作用。在6%范围内,随阻燃剂F-TiP含量的增加,复合材料的拉伸强度上升,断裂伸长率下降。

A kind of functional titanium phosphate （F-TiP） with core-shell structure was successfully synthesized and mixed with polycarbonate （PC） via melting blend. The limiting oxygen index （LOI）, vertical burning test （UL-94）, thermogravimetry analysis （TG） and tensile measurement were used to analyze the flame retardancy and mechanical property of PC composite. The results showed that the optimum content of F-TIP in PC composite was 6% while the PC composite had a LOI value of 32.7% and reached the V-0 rating of UL-94. The TG results showed that a larger amount of char residues were produced and $EM images showed that the structure of char residues was much more compact in the presence of F-TiP. The synergistic effect in flame retardancy between the core of TiP and the functional shell was found. However, the tensile strength of PC composite was increased in spite of the decreased elongation at break with an increasing content of F-TIP within 6% .