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Synthetic polymers are named based on the monomers they are composed of and the type of polymerization that occurs. Monomers are small molecules that join together to form long chains or three-dimensional networks known as polymers. The naming convention typically includes the name of the monomer followed by the prefix "poly-" to indicate that multiple units are present. For example, polyethylene is made from ethylene monomers. If the polymerization involves the removal of a small molecule like water, it's called a condensation polymer, and the name might reflect this process. In contrast, addition polymers, which form through the direct joining of monomers without removing any small molecules, have names that directly reflect their monomer origin. Occasionally, specific characteristics, such as the orientation of bonds (linear, branched, cross-linked) or the presence of functional groups, may also influence the naming. This systematic approach ensures clarity and consistency in scientific communication.
Water-soluble pigments are not adaptive for certain applications due to their high solubility in water. This characteristic can lead to the pigments being easily washed out or diluted in moist or wet environments, reducing their effectiveness and visibility. For example, in the context of biological functions like camouflage or signaling in animals, water-soluble pigments could fade or wash away under rain or in aquatic settings, making them less reliable. Similarly, in art or manufacturing, such pigments may not be suitable for materials exposed to moisture or requiring long-term color stability. The use of water-insoluble pigments, which are more resistant to environmental conditions, offers greater durability and persistence of color in these applications.
Low-emissivity (low-e) coating is typically applied on one of the surfaces of a double-glazed or triple-glazed window unit. This thin, virtually invisible metallic oxide layer is strategically placed on the interior surface of the exterior pane or the exterior surface of the interior pane, depending on the climate. In cold climates, the low-e coating is often found on the interior surface of the exterior pane to reflect heat back into the room while allowing sunlight to pass through. Conversely, in warmer climates, the coating may be placed on the exterior surface of the interior pane to reflect solar heat away from the building. Low-e coatings can also be applied on both surfaces in specific cases to maximize energy efficiency. They help reduce the amount of infrared energy passing through the glass, thereby improving thermal insulation and reducing energy costs.
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