MODAR initiation

MODAR Inc. (Massachusetts. USA) developed the first reactor vessel [13]. It comprised an elongated, hollow cylindrical pressure-vessel, capped at both ends so as to define an interior reaction chamber. Defined within the reaction chamber are a supercritical temperature zone, in the upper region of the reactor vessel, and a subcritical temperature zone in the lower region of the reactor vessel. Oxidation of organics and oxidizable inorganics takes place in the supercritical temperature zone. Dense matter, such as inorganic material initially present and formed by reactions, if insoluble in the supercritical-temperature fluid, falls into the liquid phase provided in the lower-temperature, subcritical zone of the vessel. A perimeter curtain of downward-flowing subcritical-temperature fluid is established about a portion of the interior of the cylindrical wall of the vessel to avoid salt-deposits on the walls of the reactor vessel. 

Building on the results of these initial studies, Modell began adding oxygen in order to explore the effect of the supercritical water environment on oxidation reactions of organic species. In 1980, he started MODAR as the first company established to develop and commercialize the SCWO process. Many of the characteristic attributes that are commonly associated with SCWO were first discovered and described by personnel at MODAR, and they established an... 

Typically polyester resins may be improved considerably by adding ATH or halogen additives. Vinyl esters can be treated with halogens. However, in both cases smoke emission still constitutes some problems because of the presence of styrene. Better relative performance may be achieved with Modar resins, as they allow greater filling ratios with ATH than polyesters, owing to the initial lower original viscosity and there is lower smoke emission due to the absence of styrene. 

MODAR Modified acrylic liquid resins have been available since the mid 80s and are used in closed mould and pultrusion technologies. When combined with ATH they offer low smoke low toxicity fire performance in composites. These resins are more accurately described as oligourethane-methacrylates dissolved in methyl methacrylate solvent monomer . Crosslinking, through the methacrylate functionality on the backbone and the solvent is initiated in the same way as for unsaturated polyester resin by decomposing an organic peroxide, either thermally or chemically with an accelerator. 

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See also in sourсe #XX -- [ ]

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