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首页> 外文期刊>Polymer Degradation and Stability >Novel flame retardants containing cyclodextrin nanosponges and phosphorus compounds to enhance EVA combustion properties
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Novel flame retardants containing cyclodextrin nanosponges and phosphorus compounds to enhance EVA combustion properties

机译：包含环糊精纳米海绵和磷化合物的新型阻燃剂，可增强EVA的燃烧性能

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摘要

A novel flame retardant intumescent system, aimed to improve the fire stability of ethylene vinyl acetate copolymer (EVA), has been prepared by melt blending of the copolymer and a complex of cyclodextrin nanosponge-phosphorus compounds. As compared to traditional systems, this complex, stable in processing conditions, has the advantage that nanosponges act as both carbon sources and foam forming agents while the phosphorus compounds are able to directly generate phosphoric acid in situ. In this context, cyclodextrin nanosponges undergo dehydration in presence of the acid source, generating water vapour and char, and thus protecting the copolymer against combustion. Different acid sources have been investigated in order to reach the optimum interaction with the nanosponges. Raman measurements and thermogravimetric analyses have shown that the cavities of nanosponges entrapped the phosphorus derivatives forming stable complexes at the temperature of EVA processing. Different amounts of these complexes (5,10 and 15 wt.%) have been added to EVA via melt blending and their flame retardancy properties measured by UL94 test and cone calorimetry. Strongly modified burning kinetics, as compared to the behaviour of the neat copolymer, have been found by UL94 test: V2 classification has been achieved for every formulation regardless of the type and the amount of complex used. EVA combustion behaviour by cone calorimetry has also been significantly affected: the heat release rate decreased dramatically down to ca. 20% in the presence of these new additives.
机译：通过将共聚物与环糊精纳米海绵-磷化合物的配合物熔融共混，制备了旨在提高乙烯乙酸乙烯酯共聚物（EVA）阻燃性的新型阻燃膨胀体系。与传统系统相比，这种复杂，稳定的加工条件具有纳米海绵既可作为碳源和泡沫形成剂的优点，而磷化合物则可以直接在原位生成磷酸。在这种情况下，环糊精纳米海绵在酸源的存在下进行脱水，产生水蒸气和焦炭，从而保护共聚物免受燃烧。为了达到与纳米海绵的最佳相互作用，已经研究了不同的酸源。拉曼测量和热重分析表明，纳米海绵的空腔在EVA加工温度下包裹了磷衍生物，形成了稳定的络合物。通过熔融共混将不同量的这些络合物（5,10和15 wt。％）添加到EVA中，并通过UL94测试和锥形量热法测量其阻燃性。通过UL94测试，已发现与纯共聚物的行为相比，燃烧动力学得到了显着改善：每种配方均实现了V2分类，而与所用复合物的类型和用量无关。锥形量热法的EVA燃烧行为也受到了显着影响：放热率急剧下降至大约1200℃。这些新添加剂的存在下占20％。

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  • 来源
    《Polymer Degradation and Stability》 |2010年第10期|p.2093-2100|共8页
  • 作者

    Jenny Alongi; rnMerima Poskovic; rnAlberto Frache; rnFrancesco Trotta;

  • 作者单位

    Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino, Alessandria Branch, Viale T. Michel 5, 15121 Alessandria, Italy;

    rnDipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino, Alessandria Branch, Viale T. Michel 5, 15121 Alessandria, Italy;

    rnDipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino, Alessandria Branch, Viale T. Michel 5, 15121 Alessandria, Italy;

    rnDipartimento di Chimica Inorganica, Chimica Fisica e Chimica dei Materiali, Universita di Torino, Via Pietro Giuria 7, 10125 Torino, Italy;

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  • 正文语种 eng
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  • 关键词

    β-cyclodextrins; nanosponges; EVA; flame retardants; cone calorimeter; UL94 classification;

    机译：β-环糊精;纳米海绵EVA;阻燃剂;锥形量热仪UL94分类;

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