Molding gels structure

Under the conditions of gelling and drying which were employed, the polymerization of the silica apparently leads to the formation of a silica gel surface with a configuration which is molded around the dye molecule originally present, so that the surface thereafter exhibits specific adsorptive power for a molecule of that type. This implies that the particles making up this type of gel structure have to be of molecular dimensions. 

Quadraxially oriented (four directional layer) glass fabric-TS vinyl ester polyester RP sheet panels with a foam core and gel coating are used. Most of the panels are 3 mm thick with molded-in rib structure supports. Body skins are bonded to the chassis with a double-stick acrylic tape developed by 3M Co. as well as mechanical fasteners. Unlike most steel designs, no B-pillar structural component between the front and rear doors is required thus providing more interior space and easy entry since doors open in opposite directions. 

If 0.01 mole of caffeine and 0.01 mole of pyrogallol are dissolved in 100 ml. of water at 60°C., a 1 1 crystalline complex will appear as the solution cools. Long needle-shaped crystals growing radially from central nuclei cause the entire solution to solidify into a gel-like structure with the fibrous appearance of mold (Figure 1). 

Gel coats are pigmented polyester coatings applied to the mold surface and are an integral part of the finished laminate. Gel coats are used widely on hand lay-up and spray-up parts to enhance surface aesthetics and coloration as well as to provide an abrasion-resistant waterproof surface that protects the underlying glass-reinforced structure. 

M 18] [P 17] If the filled liquid channels and bridges can be fixed by, e.g., freezing, polymerization or sol-gel reactions, a mold insert could be formed which would allow one to transfer the fluidic network structure as real channels into plastic or other materials [102],... 

CEs are known to react with phenols to form iminocarbonates which eventually lead to polycyanurates with the liberation of more acidic phenol moiety. This can be a method to alter the gel point of the resin, Tg, and thermal stability of the network by co-curing diphenol with CE. Thus, copolymerization of dicyanate with diphenols resulted in polycyanurates with altered network structure and diminished crosslink density [237]. However, an earlier report claims poly(imi-nocarbonate) by reaction of these two in equimolar quantities. The thermoplastic so formed was reported to retain the mechanical properties like a polycarbonate. This approach can produce strong, non-toxic, biodegradable films and molded plastics that are degradable at temperatures above 140 °C [169,238]. Except for a few very early reports [239], the reaction of CE with anhydrides to form poly(iminocarbamates) has not been explored much. 

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