Liao Yi-Jun, Wu Xiao-Li, Peng Xin, Zhou Zheng, Wu Ju-Zhen, Wu Fang, Jiang Tao, Chen Jia-Xuan, Zhu Lin, Yi Tao
School of Materials Engineering, Chengdu Technological University, Chengdu, 611730 China.
Center of Big Data for Smart Environmental Protection, Chengdu Technological University, Chengdu, 611730 China.
BMC Chem. 2019 Jan 30;13(1):9. doi: 10.1186/s13065-019-0534-6. eCollection 2019 Dec.
In recent decades, incorporating polypropylene (PP) within flame retardants has proved to be an effective method of improving the thermal stabilities of PP, but too much adversely affects the mechanical properties of this polymer materials. Herein we report a novel multifunctional flame retardant, (styrene acrylonitrile)-(titanate-modified ammonium polyphosphate) (SAN-TAPP), to simultaneously improve the mechanical properties and thermal stability of PP composites.
SAN-TAPP was synthesized by encapsulating SAN resins with functional titanate-modified APP (TAPP) and subsequently was incorporated into PP by a melt-blending process. The phase characteristics and morphology of SAN-TAPP were investigated, and the mechanical properties and thermal stability of different content of PP/SAN-TAPP composites were studied.
The results showed that the TAPP was almost entirely wrapped in the SAN resins and PP/SAN-TAPP composites exhibited the sea-island morphology. For the mechanical properties, the impact strength of PP/SAN-TAPP composite was significantly improved, especially 15 wt% SAN-TAPP filled PP/SAN-TAPP composite exhibiting 2.17 times higher than that of pure PP. And the tensile strength and modulus also increased by addition of SAN-TAPP. For the thermal stabilities, melting temperatures (T) and residual char yield were improved. Furthermore, the LOI value of PP/SAN-TAPP composites increased from 19.8 to 27.5%; The 15 and 20 wt% SAN-TAPP filled in PP/SAN-TAPP composites passed the V-2 test of UL-94, and exerted the similar effect on the flame retardancy to TAPP with the same loading.
These results revealed that a novel PP/SAN-TAPP composites with synthetically enhancement on the mechanical properties, thermal stabilities and flame retardancy, suggesting a strong correlation between the phase structure, mechanical and thermal properties.
近几十年来，将聚丙烯（PP）与阻燃剂结合已被证明是提高PP热稳定性的有效方法，但过多的阻燃剂会对这种聚合物材料的机械性能产生不利影响。在此，我们报道了一种新型多功能阻燃剂，（苯乙烯丙烯腈）-（钛酸酯改性聚磷酸铵）（SAN-TAPP），用于同时提高PP复合材料的机械性能和热稳定性。
通过用功能性钛酸酯改性的APP（TAPP）包裹SAN树脂合成SAN-TAPP，随后通过熔融共混工艺将其加入到PP中。研究了SAN-TAPP的相特征和形态，并研究了不同含量的PP/SAN-TAPP复合材料的机械性能和热稳定性。
结果表明，TAPP几乎完全包裹在SAN树脂中，PP/SAN-TAPP复合材料呈现出海岛形态。对于机械性能，PP/SAN-TAPP复合材料的冲击强度显著提高，特别是15 wt% SAN-TAPP填充的PP/SAN-TAPP复合材料的冲击强度比纯PP高2.17倍。添加SAN-TAPP后，拉伸强度和模量也有所增加。对于热稳定性，熔点（T）和残炭率得到提高。此外，PP/SAN-TAPP复合材料的极限氧指数值从19.8%提高到27.5%；15 wt%和20 wt% SAN-TAPP填充的PP/SAN-TAPP复合材料通过了UL-94的V-2测试，并且在相同负载下对阻燃性的影响与TAPP相似。
这些结果表明，一种新型的PP/SAN-TAPP复合材料在机械性能、热稳定性和阻燃性方面具有综合增强作用，表明相结构、机械性能和热性能之间存在很强的相关性。
