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Investigate and explain two experimental methods to measure the molecular ` weight distribution of
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- (a) Describe the difference between thermoplastic and thermosetting polymers. (b) How are the stiffness, strength, elongation and toughness of polymers evaluated in a quantitative manner? (c) Compare and contrast the physical properties and mechanical behavior of typical polymers in the following classes of materials: (i) flexible plastics (ii) rigid plastics (iii) fibers (iv) elastomersExplain how molecular weight of a polymer can be determined by diluteviscosity measurements?Discuss the solubility behaviour of polymers from a thermodynamic point of view. What is the influence of the molecular weight on the solubility? Discuss the two main mechanisms of phase separation in a macromolecular solution. Give a connection to thermodynamics. Discuss in own words extended chain and end-to-end distance for a polymer.
- (i) Define the criteria for condensation polymerisation to occur. (ii) Give one example of condensation polymer; draw the structure of the repeating unit for this polymer. (iii) Describe the application for the example polymer in your answer of Q4b (ii) above.13. Explain the relationship between chain symmetry and density of polymers.5. Explain the determination of molecular weight of polymer samples usingdilute viscosity measurement.
- (d) Crystalline polyethylene has a density of 1000 kg m³ and amorphous polyethylene a density of 865 kg m3. Calculate the volume fraction crystallinity of a sample of branched polyethylene which has a density of 900 kg m. Why is the crystallinity of this sample so low?what is floor temperature in thermodynamics of polymerization with the explaination of floor temperature corelatted with polymersPolyethylene terephthalate is an example of synthetic material in Materials and Engineering. 1. Describe the relation of its building blocks in connection to its “bulk” (materials) properties. (No need for essay, just a brief scientific explaination!) If you may, please send link as well of the reference that you use for the answer).
- 2. Discuss THREE (3) important factors influencing the crystallization tendency of polymers. Give examples to support your answer.Determine the solubility parameters for amorphous polypropylene and poly(methyl methacrylate). (Densities of the two polymers are 0.905 and 1.18 g/mL, respectively.) Consult a polymer handbook and suggest suitable solvents for the two polymers on the basis of solubility parameters.What effect does the presence of an α-Methyl group in a polymer chain have on the glass transition temperature?Explain with examples ?