Department for Advanced Materials and Structures, Centre de Recherche Public Henri Tudor, 66 rue de Luxembourg, L-4002, Esch-sur-Alzette.
Langmuir. 2011 Nov 15;27(22):13879-87. doi: 10.1021/la203252q. Epub 2011 Oct 18.
The present paper relies on the original idea to design multifunctional coatings, and in particular highly efficient intumescent flame retardant coatings, based on the diffusion of polyphosphates (PSPs) in exponentially growing "layer-by-layer" films made from montmorillonite (MMT) and poly(allylamine) (PAH). Here, we used polyphosphates as an acid source, polyallylamine as both a carbon source and a swelling agent, and finally clays to reinforce the intumescent char strength and also for their oxygen barrier property. The coatings made from the alternated deposition of n = 60 layer pairs of PAH and MMT reach a considerable thickness of ∼18 μm with well-defined ordering of the MMT in the direction parallel to the substrate. Structural, morphological, mechanical, gas barrier, and fire resistance properties of these films have been studied. Excellent oxygen barrier properties and extraordinary fire resistance properties are demonstrated based on the basis of a strong increase of the time to ignition and on a decrease of the heat release rate of polylactide substrates during mass loss calorimeter tests. This new and innovative intumescent flame retardant system based on (PAH-MMT)(n)-PSP coatings is a promising universal treatment for current polymeric materials.
本文基于扩散聚磷酸盐（PSPs）在指数增长的“层层”蒙脱土（MMT）和聚烯丙胺（PAH）薄膜中的原始设计理念，设计了多功能涂层，特别是高效膨胀型阻燃涂层。在这里，我们将聚磷酸盐用作酸源，将聚烯丙胺同时用作碳源和膨胀剂，最后使用粘土来增强膨胀炭层的强度并提高其氧阻隔性能。通过交替沉积 n = 60 对 PAH 和 MMT 层对，得到了厚度约为 18μm 的涂层，并且 MMT 在平行于基底的方向上具有良好的有序性。对这些薄膜的结构、形态、机械、气体阻隔和防火性能进行了研究。基于点火时间的大幅延长和质量损失量热计测试中聚乳酸基材的放热量的降低，这些薄膜表现出了优异的氧阻隔性能和非凡的防火性能。这种基于（PAH-MMT）（n）-PSP 涂层的新型创新膨胀型阻燃体系是当前聚合物材料的一种很有前途的通用处理方法。
