Calculate the amount of benzoyl peroxide initiator required to produce 2 kg of polyethylene with a molecular weight of 500,000 g/mol. Assume that 30% of the initiator is effective and that all termination occurs by disproportionation.
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Calculate the amount of benzoyl peroxide initiator required to produce 2 kg of polyethylene with a molecular weight of 500,000 g/mol. Assume that 30% of the initiator is effective and that all termination occurs by disproportionation.
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- Draw the structure of an alternating segment of butyl rubber, a copolymer of isoprene (2-methyl-1,3-butadiene) and isobutylene (2-methylpropene) prepared using a cationic initiatorCalculate the theoretical yield of the "free radical polymerization of styrene reaction": Amount of freshly distilled styrene used= 2.5mL Amount of K2S2O8 (potassium persulfate)used (1%, w/v)=1.0mL Product Mass of polystyrene powder= 1.56g Mass of polystyrene film= 1.01gExplain with more details, how you can prepare poly(ethylene oxide) by using Anionic and Cationic polymerisation
- A sample of polystyrene is composed of a series of fractions of different sized molecules. a)Calculate the number average and weight average molecular weights of this sample as well as the PDI. Comment on the PDI – is it polydispersed? b)How would adding styrene oligomer change the average molecular weights? Added amount is 5 wt. % of polymer mass and M = 1,000 g/mol. c)What would be the potential polymerisation pathways you may follow to polymerise this polymer d)What would happen if you fractionate the polymer to remove all fractions above 20,000 Da and 50% of any fraction above 15,000 Da? Recalculate the Mn, Mw, and PDI for this new system. e)What type of polymeric materials does this distribution of Mw for the new system corresponds to? Would it be likely solid or liquid at room temperature and atmospheric pressure?What is the role of benzoyl peroxide in addition polymerisation of alkenes? Explain its mode of action with the help of an example.A boron-siloxane cross linked polymer was formed from the reaction between dichlorodimethylsilane in diethyl ether with deionised water. Which was neutralised with sodium bicarbonate solution before being turned into a polymer upon the addition of boric acid. What is the structure of the polymer synthesised and what is the molecular weight of one monomer unit of this boron-siloxane cross linked polymer if the functional groups present in the molecule are; boron, hydroxyl, methyl and siloxane groups. Please draw.
- Show the structure of the polymer that results from heating the following diepoxide and diamine:Question 1 a. Briefly describe what is thermoplastic, thermoset plastic and elastomer. Give examples to clarify your answers. b. Briefly discuss the effect of thermodynamic on polymerization. c. What are important factors influencing the properties of polymers? Question 2 a. Discuss the suitable initiator to start an addition polymerization. b. Define what is auto-acceleration, what causes this effect and how to minimize this effect. c. Briefly discuss emulsion and suspension polymerization techniques. Question 3 a. Discuss the differences between condensation and addition polymerization. b. What requirement should be provided to achieve high yield and high molecular weight of polymer by condensation reaction? c. What is interfacial polymerization? Question 4 a. Describe biopolymer and synthetic polymer. Give examples to support your answer b. Briefly discuss the classification of polymers. c. Why polymers are widely used in our daily life? Question 5 a. Describe TWO (2) important…A boron-siloxane cross linked polymer was formed from the reaction between dichlorodimethylsilane in diethyl ether with deionised water. Which was neutralised with sodium bicarbonate solution before being turned into a polymer upon the addition of boric acid. What is the structure of the polymer synthesised and what is the molecular weight of one monomer unit of this boron-siloxane cross linked polymer?