Which of the following compound used in Ziegler- Natta catalysts to develop a stereospecific polymers? a. TiCl3 O b. CaCl2 О с. ZnClz O d. NaCl
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Q: What is charge transfer mechanism in N type doped polyaceteylene? Explain!
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- A previous synthesis of CdSe nanoparticles used Cd(CH3)2. You might think that Cd(CH3)2 is similar to the very toxic Hg(CH3)2. Explain why Cd(CH3)2 is not as toxic as Hg(CH3)2 ?In a non-acid catalyzed step-growth polymerization between A-A and B-B monomers, the A groups are titratable by aqueous base (1 N) and [A-A] [B-B) = 6 mol.kg-1. a) What is the DP if it takes 100 mL of base to neutralize the reaction mixture at 700 minutes of reaction time (assuming the initial total weight 500 g)?...Describe the differences among 137Cs, 131I, and 133Xe and their nonradioactiveisotopes
- Determine the change in kinetic chain length if the concentration of monomer decreases by 6.5 and the concentration of initiator increases by 4.9 during chain polymerization? 9.29 14.39 31.85 2.94Discuss the reasons for the differences in glass transition temperature for the following pairs of polymers. Hint: check factors that affect Tg Polyethylene (-120°C) and polypropylene (-20°C)Sketch and label the expected stress-strain curves at room temperature for lightly cross-linked poly(butadiene) and reinforced poly(methyl methacrylate). Compare the behaviour of each specimen in terms of modulus and toughness.
- What is charge transfer mechanism in N type doped polyaceteylene? Explain!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…Describe the industrial polymerization of Nylon 6,6 a) Write down the reaction mechanism. What is the polymerization mechanism that it follows? b) What are the glass transition and melting temperatures of this polymer? Describe the techniques and their principles used to determine these properties c) How would you determine its molecular weight? d) How would you manufacture pantyhose from this polymer? Describe the process from reaction to final product.
- 8. When an equilibrium step-growth polymerization is 99% complete, what fraction of the reaction mixture is still monomer (a) on mole basis and (b) on weight basis ?. At room temperature, classify the following materials as elastomers, TP or TS polymers:a) a lightly cross-linked copolymer with Tg = -45 oCb) a branched polypropylene of Tg = -8 oCc) epoxy resin matrix in advanced compositesCalculate 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= 1.01g