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首页> 外文期刊>Journal of Applied Polymer Science >Intra- and extra-gallery reactions in tri-functional epoxy polymer layered silicate nanocomposites
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Intra- and extra-gallery reactions in tri-functional epoxy polymer layered silicate nanocomposites

机译：三官能环氧聚合物层状硅酸盐纳米复合材料的内部和外部画廊反应

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摘要

Achieving a high degree of exfoliation in epoxy-based polymer layered silicate (PLS) nanocomposites is crucial to their successful industrial application, but has hitherto proved elusive. In this work, a system is presented which shows significant promise in this respect. The isothermal cure of PLS nanocomposites based upon a tri-functional epoxy resin (TGAP) has been studied by DSC, and displays two exothermic peaks. The first peak, very rapid, relates to a homopolymerization reaction within the intra-gallery regions, while the second peak reflects the bulk crosslinking reaction. The occurrence of the intra-gallery reaction before the bulk reaction enhances the degree of exfoliation in the cured nanocomposite. Furthermore, pre-conditioning the resin/clay mixture before adding the curing agent and effecting the isothermal cure also allows a greater extent of intra-gallery reaction to occur before the extra-gallery epoxy-amine reaction. Consequently, this system results in a high degree of exfoliation, as revealed by transmission electron microscopy.
机译：在基于环氧的聚合物层状硅酸盐（PLS）纳米复合材料中实现高度剥离对于其成功的工业应用至关重要，但迄今已被证明难以捉摸。在这项工作中，提出了一个在这方面显示出重大希望的系统。 DSC研究了基于三官能环氧树脂（TGAP）的PLS纳米复合材料的等温固化，并显示出两个放热峰。第一个峰非常快，与画廊内区域内的均聚反应有关，而第二个峰反映了整体交联反应。在本体反应之前发生画廊内反应会增强固化的纳米复合材料的剥离程度。此外，在添加固化剂并进行等温固化之前对树脂/粘土混合物进行预处理，还可以在画廊外的环氧胺反应之前发生更大程度的画廊内反应。因此，如透射电子显微镜所揭示的，该系统导致高度的剥离。

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