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|標題:||Exfoliation of smectite clays by branched polyamines consisting of multiple ionic sites||作者:||Chiu, C.W.
|關鍵字:||intercalation;exfoliation;smectite clay;poly(oxypropylene)-amine;layered silicate nanocomposites;fluorine mica;polymer-clay;montmorillonite;intercalation;salts;adsorption;emulsion||Project:||European Polymer Journal||期刊/報告no：:||European Polymer Journal, Volume 44, Issue 3, Page(s) 628-636.||摘要:||
Exfoliation through an ionic exchange reaction of layered silicate clays, including synthetic fluorinated mica (Mica) and natural montmorillonite (MMT), were achieved by using polyvalent amine salts as the intercalating agents. The requisite polyamine was synthesized from the epoxy/amine coupling reaction, involving a trifunctional poly(oxypropylene)-triamine (ca. 440 g/mol M(W)) and diglycidyl ether of bisphenol-A. The polyamine was a mixture of oligomeric adducts consisting of multiple amine functionalities and a branched backbone. Partial acidification by HCl addition generated a series of amine salts that affected the intercalation and the expansion of the silicate interlayer in the range of 15.2-60.0 angstrom XRD d spacing. At the specific acidified ratio (H(+)/amine = 1/3 equiv ratio), the polyamine salts rendered the clay's layered structure into randomization. The result was confirmed by using XRD and transmission electronic microscopy (TEM). The hybrids of polyamines and Mica or MMT were blended into epoxy resins and cured into nanocomposites, which exhibited the improvements of thermal stability and hardness. (C) 2007 Elsevier Ltd. All rights reserved.
|Appears in Collections:||化學工程學系所|
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