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= Hydrotalcite-like layered double hydroxide =
[http://en.wikipedia.org/wiki/Hydrotalcite Hydrotalcite] is a [http://en.wikipedia.org/wiki/Layered_double_hydroxide layered double hydroxides] which is a natural mineral. It is environmental friendly and is used for the following:
* [http://en.wikipedia.org/wiki/Fire-retardant Fire-retardant] additive.
* Heat stabilizer.
* [http://en.wikipedia.org/wiki/Polyvinyl_chloride PVC] stabilizer.

Current research projects at UP consider the use of both synthetic and natural clays for use as functional materials. Benign polymer additives are a particular focus. The following projects are active:
* Nanoclays as controlled release vehicles for insecticides
* Synthesis and intercalation methods for layered double hydroxides from inexpensive raw materials
* Layered double hydroxides as heat stabilizers for PVC 
* Intercalated clays and graphites to enhance fire resistance, thermal and electrical conductivity or mechanical properties of polyolefins

To date the research has led to several novel technologies.

One such a technology is a procedure for intercalation of clays and a degradable polymer technology. Such degradable polymer technology has been put forward as a possible litter reduction strategy. IAM developed degradation enhancing additives based on nanostructured anionic clays. The idea is to accelerate the natural sunlight mediated degradation pathways of a littered plastic object, e.g. shopping bags. The technology was patented locally and licensed to Evergreen. Commercialization of this new nanotechnology route for controlled lifetime plastics is being investigated.

Another is the intercalation of hydrotalcite and has led to the development of advanced heat stabilisers for PVC.  These stabilises show an increases performance compared to the current commercial materials.  IAM is in the process of patenting the technology. 

A local patent by one of the researchers in the group revealed a novel synthesis method for layered double hydroxides from inexpensive run-of-the-mine raw materials.  Of late, layered double hydroxides synthesised from other run-of-the-mine and recycled raw materials have successfully been prepared by applying the technology.  These materials show a significant cost advantage compared to current commercial materials.  Work is currently being done to optimise the synthesis method and develop mew markets and applications for the materials.


Back to [http://ragnarok.up.ac.za/wiki/Institute_for_Applied_Materials Institute of Applied Materials].