- Author
-
Zammarano, M.
|
Franceschi, M.
|
Bellayer, S.
|
Gilman, J. W.
|
Meriani, S.
- Title
- Preparation and Flame Resistance Properties of Revolutionary Self-Extinguishing Epoxy Nanocomposites Based on Layered Double Hydroxides.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
Cimteclab, Area Science Park, Padriciano 99, 34012 Trieste, Italy
Materials and Natural Resources Department, University of Trieste, Valerio 2, 34127 Trieste, Italy
- Journal
-
Polymer,
Vol. 46,
No. 22,
9314-9328,
October 2005
- Keywords
-
nanocomposites
|
epoxy resins
|
flame resistance
|
clay
|
self-extinguishment
|
flame retardants
|
experiments
|
x-ray diffraction
|
thermal properties
|
cone calorimeters
|
thermogravimetrical analyses
- Identifiers
- layered double hydroxides/epoxy (LDHs/EP) nanocomposites; synthesis of the organo-modified LDHs; description and sample identification of anionic clays; description and sample identification of epoxy micro/nano-composites; preparation of epoxy micro/nano-composites; elemental analysis data of MG61/ABSsx; cone calorimeter data
- Abstract
- Layered double hydroxides/epoxy (LDHs/EP) nanocomposites were prepared from organo-modified LDHs, a diglycidyl ether of bisphenol A monomer (DGEBA) and amine curing agents. The organo-modified LDHs were obtained by ionic exchange of a magnesium-aluminum carbonate LDH in an acid medium. X-ray diffraction and transmission electron microscopy showed a dispersion of the layers at a nanometer scale, indicating the formation of LDH/EP nanocomposites. The thermal degradation and flame resistance properties of LDH/EP nanocomposites, montmorillonite-epoxy (MMT/EP) nanocomposites, LDH/EP microcomposites and aluminum hydroxide-epoxy microcomposites were compared by thermogravimetrical analyses, simultaneous thermal analyses, UL94 and cone calorimeter tests. Only LDH/EP nanocomposites showed self-extinguishing behavior in the horizontal UL94 test; LDH/EP microcomposites and MMT/EP nanocomposites samples burned completely showing that the unique flame resistance of LDH/EP nanocomposites is related to both the level of dispersion and the intrinsic properties of LDH clay. Furthermore, cone calorimeter revealed intumescent behavior for LDH/EP nanocomposites and a higher reduction in the peak heat release rate compared to MMT/EP nanocomposites.