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Thermoresponsive
In detail describe the chemical principles of thermal response (why are they thermoresponsive?).
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- POLYMER CHEMISTRY - 1. Briefly describe what is thermoplastic, thermoset plastic and elastomer. Give examples to clarify your answers. 2. Briefly discuss the effect of thermodynamic on polymerization. 3. What are important factors influencing the properties of polymers?Compare thermoplastic and thermosetting polymers: (a) according of mechanical characteristics upon heating; and (b) on the basis of possible molecular structures.The properties of polymer materials are not only influenced by the nature of the matrix polymers but also by: O -The additive composition -The type of functional groups O -The processing temperature
- 13. Explain the relationship between chain symmetry and density of polymers.what is floor temperature in thermodynamics of polymerization with the explaination of floor temperature corelatted with polymersWhat sets thermoplastics and thermosets apart from the other? * retaining of plastic properties adaptation to their long polymer chains reaction to heat coping with their bonds Study the following statements: (a) The attached small groups of a linear polymer, a long chain with an unspecified number of monomeric units, are called pendant atoms; (b) The arrangement of pendant atoms or groups gives distinct properties of polymers. Which statement(s) is/are true? neither a nor b b both a and b a
- Use an example to show how branching and crosslinking can affect the physical behavior of a polymer.Describe the general process of polymer dissolution in a solvent. Other than polarity, list the other factors where the dissolution of polymers is dependent on.1.What is ceiling temperature in thermodynamics of polymerization? Explain the correlation of ceiling temperature with polymers. Show the equations to support your answer. 2.What is floor temperature in thermodynamics of polymerization? Explain the correlation of floor temperature with polymers. Show the equations to support your answer. 3.Discuss the differences between ceiling temperature and floor temperature.
- What is syndiotactic polymers ?(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) elastomersHow does a nucleus for a semi-crystalline polymer form crystalline nuclei, and how do they grow? Two semi-crystalline polymers with the same composition but with molecular weights that differ by a 5 are cooled to produce the same microstructure. Which will be stronger, which will be tougher, and why"