Radical Polymerization: Organic chemistry 2, lab 1
5) Stirring this reaction will result in little to no polymer formation. Why do you think this is?
In free radical polymerisation, the first step is initiation and also the rate-limiting step is the initiation step, that is, the rate constant for initiator (benzoyl peroxide) dissociation is much smaller than that for monomer addition.
Some of the monomers may also undergo other reactions such as combination with another radical to form inactive molecules. Due to this reason the yield of polymer formation is low or sometime it may lead to zero polymer formation.
Radical Polymerization: Organic chemistry 2, lab 1 5) Stirring this reaction will result in little to...
In reference to: (Polymerization; Nylon-6,6 Organic Chemistry Lab) 1. Why do you add hydroxide to your hexanediamine solution? What would occur if you did not add it?
Please write legibly thank you!
1. Give the detailed arrow-pushing mechanism for the free radical polymerization of methyl methacrylate. Show the initiation step and the addition of at least 2 monomers. You do not need to show a termination step, but do show the [ Jn notation of the final polymer. NEATNESS COUNTS heat poly(methyl methacrylate methyl methacrylate The initiator in this experiment, benzoyl peroxide, contains a weak 0-0 bond that undergoes homolytic cleavage at elevated temperatures. This leads to...
DRAW OUT STRUCTURAL REACTION FOR: 1. STEP POLYMERIZATION 2. RADICAL POLYMERIZATION 3. CATIONIC POLYMERIZATION 4. ANIONIC POLYMERIZATION 5. HOMOLYTIC AND HETEROLYTIC CLEAVAGE
1.) Which type of polymerization starts when a free radical is mixed with monomer units? 1) Sequential polymerization 2) Addition polymerization 3) Subtraction polymerization 4) Condensation polymerization 2.) Which of the following are structural features of a weak polymer? (choose all that apply) small substituent side-chain groups large substituent side-chain groups lots of branching in the backbone little branching in the backbone
1.Give the mechanism for the polymerization of methyl acrylate. Condensation polymerization Radical polymerization Cationic polymerization Anionic polymerization 2.Give the amount of sulfur in hard rubber 1 to 2% sulfur 2 to 5% sulfur 15% sulfur 10 to 30% sulfur 50% sulfur 3. List the small molecule that is expelled from the formation of Lexan®. ) Water Ammonia Methanol Hydrochloric acid Hydrobromic acid
combinatorial chemistry; ester synthesis
Fundamentals of Organic Chemistry Lab Post-Lab Questions 1. If you were doing these experiments on a larger scale, describe two ways that you could improve the yield of the target ester What is the point of adding sulfuric acid to the reaction? How about the heat? 2. Pick your favorite of the esters you made, and write the mechanism for its formation. 3.
Draw the organic product(s) for the following chemical reaction.
Underneath each reaction, provide a detailed mechanism(using
arrows) of how the product is produced when required.
FeCl3 n o + ch Fello Cl2 No Mechanism Polymerization Initiator *Since this is a polymerization, show the polymer using appropriate brackets. No Mechanism. H2O* Mechanism: "The above molecule polymerizes with itself. Show the polymer that is formed Mechanism: (show the formation of the trimer) 2) Draw the organic reactant(s) for the following chemical reaction....
organic chemistry II lab help 1-4 plz
Post-Lab Questions 1. Give the products from the following reactions Nabi CHOM Nath CH, OH 2. What key IR and NMR absorptions would allow you to determine that the products from the reactions above have been successfully synthesized? Ignore absorption also found in the reactant 3. Nal, usually reacts slowly or not at all with esters. Therefore, LiAlH, is often needed to reduce esters. Why do you think LiAiH, is more reactive than...
organic chemistry lab
ISOLATION OF NATURAL PRODUCTS: EUGENOL ( organic chemistry lab
)
Questions Explain why the distillate from the distillation was turbid. (0.5 marks) Why anhydrous magnesium sulphate was used in this experiment? (0.5 marks) Discuss two other methods (other than distillation and solvent extraction] that could be used of extraction of essential oils. (0.5 marks) Do not answer briefly, make sure you provide enough details to score the full mark Questions Explain why the distillate from the distillation...
Polymer Chemistry:
1. (20pt) This question is concerned with a comparison between step and chain polymerization. A. Indicate which of these statements is appropriate to step and which to chain processes: a. High MW obtained initially and continuously. b. High MW at high conversion. 2. a. Monomer concentration decreases rapidly in early stages of reaction. b. Monomer concentration decreases continuously throughout reaction. 3. a. Reaction mixture contains only high polymer, monomer and reactive species. b. Reaction mixture contains a range...