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- What 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 a11.Which is NOT TRUE about thermoplastic polymers? a. they melt or deform on heating b. they cannot be shaped into the desired form c. chainsinteract only through intermolecularforce d. they have various applications su ch as in making plastics.10a. Why each polymer gives a different melting temperature, Tm?
- Some polymeric materials are opaque and some are clear and tranparent. Explain why.Differentiate between molecular structures and behaviours of thermoplastic and thermosetting polymers. Give one example of each type.7. The polymer polystyrene can be drawn in its long form in the two ways shown below. Circle/highlight the repeating motif in this polymer. (See Question 13.3 on page 394 for an example of this type of problem.) H H H C -C ·C C fuluhun H H H H H H H C C H H H C6H5 C H H H C C C6H5 C6H5 H C6H5 C C6H5 H H C C C H H C6H5 H C -CH₂-CH-CH₂-CH-CH₂-CH-CH₂-CH-CH₂-CH-CH₂-CH-CH₂-CH-CH₂- H C6H5
- C: Explain and draw Points Defects of crystalline engineering materials.Compare thermoplastic and thermosetting polymers: (a) according of mechanical characteristics upon heating; and (b) on the basis of possible molecular structures.2- Below information is given for nickel. Atomic weight of Ni: 58.7 g/mol Melting temperature: 1455 °C Enthalpy of melting: 17650 J/mol Density of solid Ni: 8.9 g/cm • Density of liquid Ni: 7.9 g/cm • Icm'atm = 0.1013J b) Draw and explain the P-T diagram of pure nickel.
