additives | Functional fi llers


POSS technology from Hybrid Plastics is claimed to provide fi ner particle size and more uniform dispersion leading to brighter white and improved gloss.


Left: PEEK with 40 w% TiO2 dispersion and coupling agent. Right: PEEK with 40wt% TiO2 dispersion with POSS


reaction from Si-O-H to Si-O-M being thermodynami- cally driven which is favourable.” Hybrid Plastics says that a wide range of fi llers, such


as metals, metal oxides, minerals, colourants, pigments and key ingredients containing polar groups, are suitable for treatment with POSS. Amine functional POSS – AM0265 and AM0281 – are claimed to be effective for carbon-based fi llers. “Improvements with POSS include a more effective use of the fi ller at lower loadings. This applies to reinforcing fi llers and colorant. Hence, savings are realised by using less fi ller through the dispersion of the fi ller with POSS. It can also aid gloss and colour intensity,” Lichtenhan adds. “Most customers also see a decrease in viscosity through the use of POSS dispersion agents. Filler loading and viscosity increases nearly always go hand in hand. The use of POSS often breaks this paradigm. These improvements can be achieved because POSS forms cages that control the surface area and volume around particles. This affords enhanced dispersion, viscosity reduction at high fi ller loadings and more effective use of fi ller. Dispersion of fi llers through the use of surface area and volume modifi cation additives like POSS is new.” Hybrid Plastics highlights a number of new capabili-


Right: POSS treated PPE polymer


developed by Resin Enter- prise for


improved fi lled performance


ties for fi llers using POSS additives. “Traditional coupling agents and surfactants do not control the surface area around a particle. They do provide a more compatible interface. POSS cages do not polymerise on the particle surface and the cages are rigid and contain compatibilising organic groups. These cages dominate the surface area of the particle because they are rigid and around 1.5nm in diameter. Similarly, volume control around a particle is critical to controlling the viscosity of high solids and suspension stability. POSS cages provide volume around the particle and this allows fl ow and movement of the particles by each other resulting in lower viscosity. Similar viscosity reductions can be


22 COMPOUNDING WORLD | August 2016 www.compoundingworld.com


achieved by spherical particles, but it is more expensive to manufacture these. POSS can also bridge the gap between inorganic and organic materials. The hybrid organic-inorganic composition of POSS provides a mechanical inter-phase transition between a rigid/hard inorganic fi ller and the softer organic resin material.” As an example of what is possible with POSS, Hybrid Plastics has been working with The Resin Enterprise Inc. on a new application in fi lled Temppeclear com- pounds. “We are adding fl ame retardants, glass fi bre, carbon fi bre, PTFE and impact modifi ers in various combinations and/or singularly to a base resin of polyphenylene ether (PPE),” says Linda Marlin, President of The Resin Enterprise. “The addition of POSS has improved the material’s processing, physical properties and colour. This material can now compete in the market place with Radel products, as well as polysulfone and PEI. Right now the industry is starved for alternatives to PEI and polysulfone because of a market shortage of these materials. PPE is normally alloyed with polystyrene which makes the base resin processable, but it also reduces some of its high temperature and chemical resistance capabilities. With the deletion of the polystyrene and the addition of POSS, many new opportunities for Temppeclear are emerging. The addition of POSS to PPE also enables the resin to become amber clear and we are continuing to develop methods to improve the translucency of this material to a window clear tint. Some of the markets we are working on include automotive, laboratory, food products and plumbing.


Click on the links for more information:  www.mineralstech.com  www.kishcompany.com  www.sphereone.net  www.lkabminerals.com  www.leistritz.com  www.hybridplastics.com  www.resinenterprise.com


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