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- 8.66 What structural characteristics are needed for additives such as plasticizers?Some polymeric materials are opaque and some are clear and tranparent. Explain why.11. polymerization involves at least two different monomers. Choose Addition structure of thermplastiss Condensation S. Substitution Oxidation
- 2. Why does a transparent polymer turn opaque in the necked region when tested in tension.The notation below represents a of a(n) polymer. HH +c-c+ HH monomer, addition repeating unit, condensation repeating unit, addition monomer, condensationWhat specific aspects of polymer molecule structure (e.g., side group size, shape, polarity, and location) favor chain sliding?
- 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 C6H5Compare thermoplastic and thermosetting polymers: (a) according of mechanical characteristics upon heating; and (b) on the basis of possible molecular structures.What impact will polarity of pendant groups have on the glass temperature of thermoplastic versus a thermosetting polymer
- Linear and syndiotactic poly(vinyl chloride); linear and isotactic polystyrene • State whether it is possible to determine whether one polymer is more likely to crystallize than the other. • If it is possible, note which is the more likely and then cite reason(s) for your choice. • If it is not possible to decide, state why.To be a useful plastic, an amorphous polymer must be below its Tg at the ambient temperature, while crystalline polymers may be either above or below their Tg’s. Explain why.Do higher molecular weight polymers have a higher elastic modulus? Give a reason why this is/is not the case.