Absorbed polymer-coated substrates

Solution polymers offer the absorbency of a granular polymer supplied in solution form. Solutions can be diluted with water prior to application, and can coat most substrates or can be used to saturate. After drying at a specific temperature of a specific time, the result is a coated substrate with superabsorbent functionality. For example, this chemistry can be applied directly onto wires cables, though it is especially optimized for use on components such as rolled goods or sheeted substrates. 

Silicones contain very low levels of impurities such as mobile ions and absorb very little water. As already noted, their surface is highly water-repellent. On the other hand, their open molecular structure makes them more permeable to water vapour than many other polymers. Taken together, these characteristics mean that a silicone-coated substrate will be well protected provided that it is not itself absorbent and that surface contact at the interface is good. 

Eversorb 73 is a benzotriazole type absorber. It offers superior light protection of polyolefin substrates against the deterioration of UV radiation. Eversorb 73 is also efficient for the light stabilization of polyvinyl chloride, unsaturated polyester, polyurethane, styrenic polymers, coatings and lacquers. 

It is noted that the UV absorbance of the 10(g)-32(sc) sample decreased after the annealing treatment, as shown in Fig. 28a. Presumably, most polysilane chains lie down before annealing in the quartz substrate plane, as the film was prepared by the spin-coating technique. However, the thermal annealing treatment of semi-flexible 32 tends to orient some of the polymer chain segments perpendicularly and/or tilt them to the substrate plane, leading to the decrease in the apparent UV absorbance at 321 nm, as illustrated in Fig. 27. 

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