Polyimides are polymers that are tough and stable at temperatures up to 400°C. They are used as a protective coating on the quartz fibers in fiber optics. What monomers are used to make the following polyimide?
Answer to relevant QuestionsPolycarbonates are a class of thermoplastic polymers that are used in the plastic lenses of eyeglasses and in the shells of bicycle helmets. A polycarbonate is made from the re¬action of bisphenol A (BPA) with phosgene ...In Section 21.6 three important classes of biologically important natural polymers are discussed. What are the three classes, w’hat are the monomers used to form the polymers, and why are they biologically important? Write the sequence of all possible tetrapeptides composed of the following amino acids. a. Two phenylalanines and two glycines b. Two phenylalanines, glycine, and alanine Indicate the chiral carbon atoms found in the monosac-charides D-ribose and D-mannose. Tautomers are molecules that differ in the position of a hydrogen atom. A tautomeric fonn of thymine has the structure If this tautomer, rather than the stable form of thymine, were present in a strand of DNA during ...
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