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Q1:Question 14 The creep rupture envelope are used to select and predict? Mark all that apply. safe loads acceptable temperatures 0.2 pts O acceptable time of imposed laods/nQuestion 7 The creep is a function of the followings: polymer properties exposue to sun light exposure time to a load exposure temperature applied load 0.2 pts environmmental factors/nD Question 15 0.1 pts The Boltzmann superposition principle states that the response of a polymer to a given load is dependent of the response of the polymer to any load, which is already imposed on the polymer. O True O False/nQuestion 10 Polymers creep below their yield point and but recover after the load is removed. O True 0.1 pts O False/nQuestion 5 In the case of polymers and their creeping, it is necessary to consider? Mark all that apply. temperature applied load time 0.2 pts O UV radiationSee Answer
Q2:Question 4 Polymers are viscoelastic at? O glass transition temperature O above glass transition temperature O below glass transition temperature O all temperaturesSee Answer
Q3:2. In an externally added acid catalyzed poly-esterification, the conversion increased from 98% to 99% in 82 minutes. Calculate an estimate of time that was needed to reach the 98% conversion. (15 marks) 3) Identify the steps involved in drawing the reaction pathway of a step polymerization reaction. (5 marks)/n1. Given 98.5% conversion of monomers with average molecular weight 150 g/mol, calculate Mw, Mn and PDI. (15 marks)See Answer
Q4:1. Explain the following terms used for characterizing chain polymerization and provide relevant equations. (5-points) a. Kinetic chain length, u b. Probability of chain propagation, ß c. Radical efficiency factor, f (5-points) (5-points)See Answer
Q5:2. Many olefins can be readily polymerized by a free-radical route. On the other hand, isobutylene is usually polymerized by a cationic mechanism. Explain. (10- points)See Answer
Q6:3. A reaction has the rate of initiation of 1.5x107 Ms¹ and the rate of propagation of 7.8x 105 Ms¹¹. a. Determine the kinetic chain length (5-points) b. Determine the extent of reaction if the reaction was terminated by: i. Disproportionation ii. Combination iii. 50% disproportionation, 50% combination (5-points) (5-points) (5-points)See Answer
Q7:L 4. In a living polymerization, chain length simplifies to [M]/[I]o because all initiation leads to polymerization and there are no termination steps. Given a radical polymerization with [M] = 4.5 M and [I]o = 1.25 mM, compare chain length in the following situations: a. a living polymerization (5-points) = b. a non-living polymerization with f = 0.5; kpk = 0.003s-1; kg = 0.0001 s-1. (5-points) c. a non-living polymerization with f = 0.5; p = 0.003s-1; k= 0.3s-1; ka=0.0001 s-1. (5-points) d. a non-living polymerization with f = 0.5; p = 0.003s¹; k= 0.003s¹; ka=0.1s¹. (5-points)See Answer
Q8:5. Consider the polymerization of styrene in toluene at 60°C initiated by di-t- byggside for a solution containing 0.04 mol of initiator and 2 mol of monomer per liter respectively. The initial rates of initiation, B., and propagation, B., are found to be 1.6x 10-10 Ms and 6.4 x 10 Ms", respectively, at 60°C. a. Cakulate and (5-points) b. Assuming no chain transfer, calculate the initial kinetic chain length. 6 points) c. Cakulate the conversion obtained after the reaction has gone for 5 h. (5 points) d. Assuming only disproportionation and under the conditions stated, the transfer constant of styrene, C, is 0.85 x 10%. How much does this transfer affect the molecular weight of the polymer? (5 points) e. The molecular weight of this polymer is too high. The desired molecular weight of this polymeris 40,000 g mol". How much CC14 (in g L") should be added to the reaction medium to attain the desired molecular weight?C, of CC14 is 9x 107 ¹. (5 points)See Answer
Q9:6. The efficiency of ABN in initiating polymerization at 60°C was determined by the following strategy. They measured B, and v and calculated B. - B₁/v. The constant kd was measured directly in the system, and from this quantity and the measured ratio B,/v the fraction f could be determined. The following results were obtained for different concentrations of initiator. Using k.-0.0388 h¹, evaluate f from these data. (where fis your radical efficiency factor). (10 points) [I] (gL¹) Rp/ × 10ª (mol L−¹ s¯¹) 0.377 1.57 1.72 6.77 0.0556 0.250 0.250 1.00 1.50 2.50 10.9 17.1See Answer
Q10:2. Describe each of the following processes - identify the required reagents, explain how the reactions happen and support with relevant mechanisms of reaction where possible. (10 points) r a. cationic polymerization b. anionic polymerization c. coordination polymerizationSee Answer
Q11:3. Draw the copolymer formed when these two monomers combine: (15 pts) a) Styrene - Butadiene b) Styrene - Acrylonitrile c) Vinylidene chloride - vinyl chloride H H X.X + H H (10 points)See Answer
Q12:6. What is composition drift? How can it be prevented? (10 points)See Answer
Q13:8. Explain azeotropic feed composition in copolymerization, (10 points)See Answer
Q14:Question 10 Polymers creep below their yield point and but recover after the load is removed. O True O FalseSee Answer
Q15:Question 13 How many stages are observed in the strain vs. time creep curve ?See Answer
Q16:Question 14 The creep rupture envelope are used to select and predict? Mark all that apply. safe loads acceptable temperatures acceptable time of imposed laodsSee Answer
Q17:Question 15 The Boltzmann superposition principle states that the response of a polymer to a given load is dependent of the response of the polymer to any load, which is already imposed on the polymer. O True O FalseSee Answer
Q18:Question 16 According to the Boltzmann superposition principle, each loading step makes independent contribution to total loading history. O True O FalseSee Answer
Q19:Question 1 If a load is imposed on a polymer, the strain will? O remain constant O decrease O increaseSee Answer
Q20:Question 2 If a load is imposed on a polymer, the strain will increase slowly with time due to? slipping of crystalline structure change in a molecular arrangement build up of tensionsSee Answer

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