Tercjak, A. and Garcia, I. and Mondragon, I. (2008) Liquid crystal alignment in electro-responsive nanostructured thermosetting materials based on block copolymer dispersed liquid crystal. NANOTECHNOLOGY, 19 (27).
Full text is not hosted in this archive but may be available via the Official URL, or by requesting a copy from the corresponding author.
Official URL: http://www.iop.org/EJ/abstract/-search=66120084.1/...
Novel well-defined nanostructured thermosetting systems were prepared by modification of a diglicydylether of bisphenol-A epoxy resin (DGEBA) with 10 or 15 wt% amphiphilic poly(styrene-b-ethylene oxide) block copolymer (PSEO) and 30 or 40 wt% low molecular weight liquid crystal 4'-(hexyl)-4-biphenyl-carbonitrile (HBC) using m-xylylenediamine (MXDA) as a curing agent. The competition between well-defined nanostructured materials and the ability for alignment of the liquid crystal phase in the materials obtained has been studied by atomic and electrostatic force microscopy, AFM and EFM, respectively. Based on our knowledge, this is the first time that addition of an adequate amount (10 wt%) of a block copolymer to 40 wt% HBC-(DGEBA/MXDA) leads to a well-organized nanostructured thermosetting system (between a hexagonal and worm-like ordered structure), which is also electro-responsive with high rate contrast. This behavior was confirmed using electrostatic force microscopy (EFM), by means of the response of the HBC liquid crystal phase to the voltage applied to the EFM tip. In contrast, though materials containing 15 wt% PSEO and 30 wt% HBC also form a well-defined nanostructured thermosetting system, they do not show such a high contrast between the uncharged and charged surface.
|Uncontrolled Keywords:||EPOXY-RESIN; MECHANICAL-PROPERTIES; DIBLOCK COPOLYMER; SYNDIOTACTIC POLYSTYRENE; TRIBLOCK COPOLYMER; FORCE MICROSCOPY; LIGHT-SCATTERING; DIAMINE BLENDS; MORPHOLOGY; FILMS|
|Subjects:||Analytical Science > Microscopy and probe methods|
Material Science > Nanostructured materials
|Deposited On:||25 Sep 2009 12:06|
|Last Modified:||25 Sep 2009 12:06|
Repository Staff Only: item control page