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polyester criterion
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Resin 7 refers to a type of skateboard construction technology that uses a specific epoxy resin adhesive to bond the seven plies of Canadian maple wood together. This method is distinct from the traditional use of water-based glues. The resin-epoxy adhesive enhances the durability, stiffness, and lifespan of the skateboard, making it less prone to delamination and providing a more consistent pop. Boards made with Resin 7 technology are favored by many skaters for their superior performance and environmental benefits, as the epoxy resin produces fewer harmful emissions compared to traditional adhesives.
Amines are organic compounds derived from ammonia (NH₃) by replacing one or more hydrogen atoms with hydrocarbon groups (alkyl or aryl groups). The basicity of amines is due to the lone pair of electrons on the nitrogen atom, which can readily accept a proton (H⁺). This makes amines basic in nature, as opposed to acidic. The nitrogen’s lone pair is available for bonding with acids, making amines good nucleophiles as well. The basic strength of an amine depends on its structure and the electron-donating or withdrawing nature of the substituents. Aliphatic amines are usually stronger bases than ammonia, while aromatic amines, like aniline, are weaker bases due to the delocalization of the nitrogen's lone pair into the aromatic ring, stabilizing the molecule and making the lone pair less available for protonation.
Group IV of the periodic table contains titanium.
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