formulate detailed reaction pathways for the preparation of the following polymers
a) w-carboxyl functionalised polystyrene by anionic polymerisation methods
b) polystyrene by cationic polymerisation methods
c) polysulfone by step growth polymerisation methods
formulate detailed reaction pathways for the preparation of the following polymers a) w-carboxyl functionalised polystyrene by...
i) Which of the following is not true about step-growth polymers? Formation of step-growth polymers usually results in the loss of a small molecule. Step-growth polymers are formed by the reaction of bifunctional molecules. Step-growth polymers can be formed by a free radical mechanism. Step-growth polymers are also known as condensation polymers. Step-growth polymers do not reach high molecular weight until the reaction has gone nearly to completion. ii) Which of the following are not termination methods in radical polymerization?...
Formulate a detailed reaction pathway for the preparation of linear, isotactic polypropylene by metallocene polymerization methods
Consider the preparation of an addition polymer by a radical chain reaction Q. 2 (a) Give the polymers that can be formed from each of the following monomers and show the repeating unit in each case CI OMe (b) Describe the key steps in a radical chain growth polymerisation. What is "head to tail" addition and explain why it preferentially occurs (c) (d) Show the resonance stabilisation for the radical formed where possible for each of the monomers given in...
3 Match the following polymer with the common product in which it is used (see intro for help). 1. polystyrene 2. nylon 3. polypropylene 4. low density polyethylene 5. polycarbonate a. Plastic Bags b. Water Pipes c. Cookware d. Egg containers e. Milk cartons 6. polyethylene f. Carpet and Knitted fabrics 7. polyvinylchloride 9. Automobile bumpers 8. polytetrafluoroethylene h. Rope 4. Shown below are monomers for common polymers that get made. Draw two repeating units of the polymer structure for...
Which of the following addition polymers results from the reaction below? nCF2-CF2 catalyst? A) [CF-CF]n B) (CF3-CF3]n C)[-CF2-CHCHCF2-]n D) (-CF2-CF2-Jn E) [-CF2-CF2-Jn
. (10 pts) Electrophilic addition reaction (E) and Wagner-Meerwein rearrangement (W) are involved in the biosynthesis of various terpenes in nature. List four approaches for generation of carbocation and label them with A, B, C, and D, respectively (2 pts). List three approaches for discharge of carbocation and label them with F, G, and H, respectively (1.5 pts). Draw out the structure of farnesyl diphosphate (FPP) (1 pts). Identify the following processes by labeling individual processes with a letter selected...
Calculate the number of moles of acetic anhydride present in the reaction mixture. c. w d. Based on the number of moles of each reactant and the stoichiometry of the reaction, determine the limiting reactant in the preparation. Calculate the theoretical yield of the preparation, based on the number of moles of limiting reactant present. e. Calculate the percent yield of the preparation. f. Preparation of Aspirin Page 86 6. Limiting reactant 3. Following the procedure described in this experiment,...
For the following reaction: a) Complete the reaction schemes by drawing the appropriate reagents and/or products in the spaces designated. b) Provide the generic name of Reagent Y. c) Provide the detailed mechanism for each step of the reaction.
5. Mechanism: (20 pts) Show the detailed reaction mechanism including all relevant arrows, intermediates, inorganic products, relevant resonance structures, and stereochemistry for the following reaction heat OH H-Br Step 1 step 2 Step 3 Step 4 Product(s) a. This is a Sx2/S1/E/Ez/ reduction / oxidation mechanism. b. What is the product if the starting alcohol is reacted with PBry? Product(s) with PBry c. Reaction with PBr; is a S2/S1/E/Ez/reduction / oxidation mechanism.
5. Mechanism: (20 pts) Show the detailed reaction mechanism including all relevant arrows, intermediates, inorganic products, relevant resonance structures, and stereochemistry for the following reaction. heat OH H-Br step 1 step 2 step 3 step 4 Product(s) a. This is a S2/Sx1/E/E2/ reduction / oxidation mechanism. b. What is the product if the starting alcohol is reacted with PBrz? Product(s) with PBrz c. Reaction with PBr3 is a S2/S1/Ej / E2 / reduction / oxidation mechanism.