PolyHIPE - Sept 12
Published on: Mar 4, 2016
Transcripts - PolyHIPE - Sept 12
The Polymer & Composite Engineering (PaCE) Group and Porous Materials by Concentrated Emulsion Templating Dr Angelika Menner & Prof Alexander Bismarck Competition sponsored by:
Polymer & Composite PaCE Engineering Group Department of Chemical Engineering at Imperial College London Prof A BismarckWe are a material science group specialised in responsive materials, green materials, polymer (nano)composites, multifunctional materials and POROUS POLYMERS
Emulsion Templating – How it works Emulsion template: The continuous phase contains monomers, crosslinker, emulsifier (surfactants or particles) and initiator. The monomers and crosslinker mainly define the mechanical performance of the Highly viscous final product; it can be adjusted from rubbery to emulsion hard and tough. Furthermore, particles can be added to reinforce the pore walls or to add function by making the polymer foam magnetic or Polymerisation Purification and conductive. at 70 °C drying The aqueous phase consists of water and an electrolyte; it is dispersed as droplets in the continuous phase. The volume fraction defines the porosity (60% - 95%). The aqueous phase droplets are the template – the droplet size and distribution define the morphology of the polymer foam.Pore throats – these areholes in the pore walls whichinterconnect the pores andmake the polymer foampermeable Pore – this is where the aqueous phase droplet has been before.
Porous Materials with various morphologies Highly interconnected Closed celled Tailor made morphologies: The morphology has a direct impact on properties such as permeability and mechanical performance. Pore sizes range from 5 to 800 µm Pore throat sizes range from 2 to 50 µm Hierarchical structures:large pores surrounded by small,highly interconnected pores
Porous Materials in various shapes Monoliths Tailor made shapes: Although the emulsions are highly viscous they are still liquid, which Beads means they can be moulded in any desired shape. The polymerised and dried porous product retains the shape and size as the material is highly crosslinked – no shrinkage.Membranes Or what ever shape you like...
Porous Materials Potential Applications Core materials for sandwich structures Filter media in harsh environments Tissue engineeringChromatography Delivery system for self healing composites Ion exchange modules
Thank you for your time and interest! We’re sure you can come up withsome cool ideas! Remember, just use your marbles