Aromatic vs. Aliphatic Hyperbranched Polyphosphoesters as Flame Retardants in Epoxy Resins
Aromatic vs. Aliphatic Hyperbranched Polyphosphoesters as Flame Retardants in Epoxy Resins
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DOI：
10.3390/molecules24213901
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发表时间：
2019-11-01
期刊：
影响因子：
4.6
通讯作者：
Wurm, Frederik R.
中科院分区：
文献类型：
--
作者：
Markwart, Jens C.;Battig, Alexander;Wurm, Frederik R.
由于几种卤化阻燃剂的禁用，未来阻燃剂（FR）的当前趋势是新型高效无卤材料。其中最有前途的替代品是磷基FR，其中，最近报道了具有复杂形状的聚合物材料。在此，我们提出了新的无卤素的芳香族和脂肪族超支化聚磷酸酯（hbPPEs），这是通过烯烃复分解聚合合成的，并研究了它们作为环氧树脂的阻燃剂。我们比较了它们的效率（脂肪族与芳香族），并进一步评估了单体化合物和hbPPE之间的差异。化合物的分解和挥发行为是影响其阻燃性能的重要因素，但与热解基体的相互作用也对其性能有重要影响。因此，设计FR的挑战是优化化学结构及其在时间和温度方面分解到基质的途径。这种行为在本研究中变得明显，并解释了脂肪族FR的上级气相活性。
The current trend for future flame retardants (FRs) goes to novel efficient halogen-free materials, due to the ban of several halogenated FRs. Among the most promising alternatives are phosphorus-based FRs, and of those, polymeric materials with complex shape have been recently reported. Herein, we present novel halogen-free aromatic and aliphatic hyperbranched polyphosphoesters (hbPPEs), which were synthesized by olefin metathesis polymerization and investigated them as a FR in epoxy resins. We compare their efficiency (aliphatic vs. aromatic) and further assess the differences between the monomeric compounds and the hbPPEs. The decomposition and vaporizing behavior of a compound is an important factor in its flame-retardant behavior, but also the interaction with the pyrolyzing matrix has a significant influence on the performance. Therefore, the challenge in designing a FR is to optimize the chemical structure and its decomposition pathway to the matrix, with regards to time and temperature. This behavior becomes obvious in this study, and explains the superior gas phase activity of the aliphatic FRs.