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首页> 外文会议>the Annual Conference on Recent Advances in Flame Retardancy of Polymeric Materials >REACTIVE FLAME RETARDANTS BASED ON PHOSPHORUS FOR SOME CHAIN-GROWTH POLYMERS
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REACTIVE FLAME RETARDANTS BASED ON PHOSPHORUS FOR SOME CHAIN-GROWTH POLYMERS

机译：基于一些链生长聚合物的磷的活性阻燃剂

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Several phosphorus-containing monomers have been free radically copolymerised with styrene, methyl methacrylate and acrylonitrile. These include phosphonate esters, phosphates and phosphorylamino esters, and contain the penta-valent P atom in different chemical environments. The resulting copolymers, having a wide range of compositions, were purified and subjected to a variety of characterization techniques such as solution-state NMR, GPC, DSC, TGA, Limiting Oxygen Index (LOI) measurements and, optionally, through cone calorimetric evaluations. Chemical modification of the base polymers with P-containing groups leads to significant increases in flame retardance as compared to the unmodified counterparts. Studies of the thermal degradation of the polymers by thermogravimetric analyses (both in air and nitrogen), and investigations of the spectral, chemical and morphological features of the char residues, indicate that the mechanism of flame retardance contains a significant condensed-phase component. Generally, the thermal degradation of the P-containing groups leads to the production of phosphorus acid species which, in turn, aid in the production of unsaturation and other precursors for cross-linking /aromatic components, thus resulting in the increased production of char. Limited information, obtained through evolved gas analyses, also suggests the presence of an appreciable degree of vapor-phase inhibition (i.e., retardation of gas-phase combustion), probably by phosphorus oxide species, thus resulting in increased production of smoke and CO.
机译：含几种含磷单体用苯乙烯，甲基丙烯酸甲酯和丙烯腈是自由的。这些包括膦酸酯，磷酸盐和磷酰胺酯，并含有不同化学环境中的五价P原子。纯化具有宽范围组合物的所得共聚物并进行各种表征技术，例如溶液 - 状态NMR，GPC，DSC，TGA，限制氧指数（LOI）测量，并且可选地通过锥形量热评估。与未修饰的对应物相比，含有P含基团的基础聚合物的基础聚合物的化学改性导致阻燃性显着增加。通过热重分析（空气和氮气中的热量分析的热降解的研究，以及Char残基的光谱，化学和形态特征的研究表明阻燃性机制含有显着的冷凝相组分。通常，含P组的热劣化导致磷酸种类的产生，反过来助长生产不饱和度和其他前体，用于交联/芳族成分，从而导致炭的产生增加。通过进化的气体分析获得的有限信息，也表明存在可明显的气相抑制程度（即气相燃烧的延迟），可能是通过磷氧化物物种，从而导致烟雾和CO的产生增加。

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