کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1403210 984813 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Exfoliation of smectite clays by branched polyamines consisting of multiple ionic sites
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Exfoliation of smectite clays by branched polyamines consisting of multiple ionic sites
چکیده انگلیسی

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 Mw) 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 Å 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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Polymer Journal - Volume 44, Issue 3, March 2008, Pages 628–636
نویسندگان
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