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- (19) Explain the following polymerization mechanism by showing propagation reactions with the catalyst three times (draw chemical structures of the intermediates of the first, second, and third reaction with the monomer and catalysts). R LnW=CHR' taadd R (2) Why is HT-3-hexyl polythiophene better in conductivity than other regioisomers? Explain the reasons from the intramolecular and intermolecular aspects, respectively.(a) Draw the structure of the prepolymer A formed from 1,4-dihydroxybenzene and excess epichlorohydrin. (b) Draw the structure of the cross-linked polymer B formed when A is treated with H2NCH2CH2CH2NH2 as the hardening agent.A sample of methacrylate (CH2=CHCOOCH3) is polymerized, the resulting polymer has a degree of polymerization of 1000. Draw the structure for the repeating unit of the polymer and calculate the polymer's molecular weigh:
- (a) Hard contact lenses, which first became popular in the 1960s, were made by polymerizing methyl methacrylate [CH2 = C(CH3)CO2CH3] to form poly(methyl methacrylate) (PMMA). Draw the structure of PMMA. (b) More comfortable softer contact lenses introduced in the 1970s were made by polymerizing hydroxyethyl methacrylate [CH2 = C(CH3)CO2CH2CH2OH] to form poly(hydroxyethyl methacrylate) (poly-HEMA). Draw the structure of poly-HEMA. Since neither polymer allows oxygen from the air to pass through to the retina, newer contact lenses that are both comfortable and oxygen-permeable have now been developed.(1) Explain the following polymerization mechanism by showing propagation reactions with the catalyst three times (draw chemical structures of the intermediates of the first, second, and third reaction with the monomer and catalysts). LnW=CHR' tanda (2) Why is HT-3-hexyl polythiophene better in conductivity than other regioisomers? Explain the reasons from the intramolecular and intermolecular aspects, respectively.None
- An equimolar blend of 1,4-hydroquinone diallylether and ethylene glycol dimercaptoacetate containing a small amount of benzophenone (radical photoinitiator) is polymerized by irradiating the blend with ultraviolet (UV) light. (a) Write a balanced chemical equation for the polymerization. (b) How would you classify this polymerization according to the reaction mechanism? (c) Calculate the extent of reaction needed to produce a polymer with a number average molar mass of 20,000 g/mole (neglect the effect of end groups in the calculation). (d) Draw the structure of the polymer that is obtained when the mole ratio of diallyl ether to dithiol is 1.1. (e) Explain briefly the consequences of including a tetrafunctional thiol in the polymerization with the exact stoichiometry 2:1:4 of difunctional thiol to tetrafunctional thiol to difunctional allylic ether. HS HS 1,4-hydroquinone diallylether Ethylene glycol dimercaptoacetate(a) Hard contact lenses, which first became popular in the 1960s, were made by polymerizing methyl methacrylate [CH2=C(CH3)CO2CH3] to form poly(methyl methacrylate) (PMMA). Draw the structure of PMMA. (b) More-comfortable softer contact lenses introduced in the 1970s were made by polymerizing hydroxyethyl methacrylate [CH2=C(CH3)CO2CH2CH2OH] to form poly(hydroxyethyl methacrylate) (poly-HEMA). Draw the structure of poly-HEMA. Because neither polymer allows oxygen from the air to pass through to the retina, newer contact lenses that are both comfortable and oxygen-permeable have now been developed.Please help me with the following Organic Chemistry question. Please give explanation where necessary.
- 2)(a) Which monomer is most likely to undergo anionic polymerization? Justify your choice. ( b)Which one ismost likely to undergo cationic polymerization? Justify your choice.Researchers at Rutgers University have developed biocompatible polymers that degrade into nonsteroidal anti-inflammatory drugs. For example, the reaction of two equivalents of benzyl salicylate and one equivalent of sebacoyl chloride forms a poly(anhydride ester) called PolyAspirin, which hydrolyzes to salicylic acid (an anti-inflammatory agent) and sebacic acid, which is excreted. This technology can perhaps be used for localized drug delivery at specific sites of injury. What is the structure of PolyAspirin?
