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A major polycarbonate market is the production of compact discs, DVDs, and Blu-ray discs. [13] These discs are produced by injection-molding polycarbonate into a mold cavity that has on one side a metal stamper containing a negative image of the disc data, while the other mold side is a mirrored surface.
Silicone caulk can be used as a basic sealant against water and air penetration. In organosilicon and polymer chemistry, a silicone or polysiloxane is a polymer composed of repeating units of siloxane (−O−R 2 Si−O−SiR 2 −, where R = organic group). They are typically colorless oils or rubber-like substances. Silicones are used in ...
A polycarbonate is an oxocarbon dianion consisting of a chain of carbonate units, where successive carbonyl groups are directly linked to each other by shared additional oxygen atoms. That is, they are the conjugate bases of polycarbonic acids , the conceptual anhydrides of carbonic acid , or polymers of carbon dioxide .
Direct bonding, or fusion bonding, is a wafer bonding process without any additional intermediate layers. It is based on chemical bonds between two surfaces of any material possible meeting numerous requirements. [1] These requirements are specified for the wafer surface as sufficiently clean, flat and smooth.
Like almost all polymers, protein fold and twist, forming into the secondary structure, which is rigidified by hydrogen bonding between the carbonyl oxygens and amide hydrogens in the backbone, i.e. C=O---HN. Further interactions between residues of the individual amino acids form the protein's tertiary structure. For this reason, the primary ...
The C–Si bond is somewhat polarised towards carbon due to carbon's greater electronegativity (C 2.55 vs Si 1.90), and single bonds from Si to electronegative elements are very strong. [14] Silicon is thus susceptible to nucleophilic attack by O − , Cl − , or F − ; the energy of an Si–O bond in particular is strikingly high.
The siloxane bond can then form via a silanol + silanol pathway or a silanol + chlorosilane pathway: 2 R 3 Si−OH → R 3 Si−O−SiR 3 + H 2 O R 3 Si−OH + R 3 Si−Cl → R 3 Si−O−SiR 3 + HCl. Hydrolysis of a silyldichloride can afford linear or cyclic products. Linear products are terminated with silanol groups: n R 2 Si(OH) 2 → H(R ...
Pressure sensitive adhesives are viscoelastic polymers with their rheology tuned to the desired bonding and de-bonding characteristics needed. [5] Typical materials used to make the adhesive include: acrylate polymer, [6] rubber, either natural rubber or synthetic thermoplastic elastomer [7] silicone rubber; and others
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