Synthesis of a highly efficient phosphorus-containing flame retardant utilizing plant-derived diphenolic acids and its application in polylactic acid
Synthesis of a highly efficient phosphorus-containing flame retardant utilizing plant-derived diphenolic acids and its application in polylactic acid
复制标题
DOI：
10.1039/c6ra06742e
复制
发表时间：
2016-01-01
期刊：
影响因子：
3.9
通讯作者：
Fang, Zhengping
中科院分区：
文献类型：
--
作者：
Jing, Jian;Zhang, Yan;Fang, Zhengping
有机磷化合物作为最受欢迎的阻燃剂之一，传统上是从石油资源中提取的。最近的兴趣是探索可再生候选物作为合成这些化合物的前体。本文报道了以植物源二酚酸（DPA）、笼型双环磷（PEPA）和苯基二氯膦（PPDC）为原料，分两步合成一种新型生物基多膦酸盐（BPPT）。用BPPT作为阻燃剂制备聚乳酸共混物。在PLA共混物中添加2 wt%、4 wt%和6 wt%的BPPT时，PLA的极限氧指数显著提高（分别为28.8、33.7和35.4）。此外，UL94可燃性测试的结果表明，BPPT可以有效地熄灭火焰，这有助于PLA共混物在BPPT加载4 wt%时达到V0水平。锥体试验和热重分析的数据证实了气相机理是高效阻燃的主要原因。此外，拉伸试验结果表明，bpt对阻燃共混物力学性能的影响最小。本文开发的阻燃PLA共混物含有超过95% wt%的生物质量含量。
Organophosphorus compounds as one of the most preferred flame retardants are traditionally derived from petroleum resources. Of recent interest is the exploration of renewable candidates as the precursors to synthesise these compounds. Here, we report the synthesis of a novel bio-based polyphosphonate (BPPT) through the reaction of plant-derived diphenolic acid (DPA), caged bicyclic phosphorus (PEPA) and phenylphosphonic dichloride (PPDC) in two steps. The BPPT was used as a flame retardant to prepare polylactic acid (PLA) blends. Significant enhancement in the limiting oxygen index of PLA (28.8, 33.7 and 35.4 with 2 wt%, 4 wt%, and 6 wt% of BPPT, respectively, in the PLA blends) was obtained. Additionally, the results in the UL94 flammability tests demonstrates that BPPT is effective to quench the flame, which facilitate PLA blends to achieve a V0 level at a BPPT loading of 4 wt%. The data of the cone tests and thermal gravimetric analysis confirm that a gas phase mechanism is mainly responsible for the highly efficient flame retardancy. Moreover, the tensile test results indicate that the BPPT-induced depression of the mechanical properties of the flame retardant blends is minimal. The flame retardant PLA blends developed herein contain a bio-mass content of more than 95 wt%.