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Modern Material Science And Engineering 2
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Modern Material Science And Engineering 2
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25 Questions

1. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed

2. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets

3. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel

4. Porcess of breaking large organic hydrocarbons into smaller molecules

5. First step in the process of polymerization - during which a free radical is formed

6. Smallest repeating unit in a polymer. aka repeat unit

7. Number of bonds a molecule has formed

8. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability

9. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber

10. Process used to make thermoset fibers by performing the polymerization reacting in a solbent as the material flows through a spinneret and into a quenching bath

11. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings

12. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property

13. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds

14. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end

15. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow

16. Conformation in which the largest substituents are offset by 180

17. Simple polymeric material produced as pellets in large quantities

18. Arrangement of the largest substituents where the substituets are offset by 120

19. Two or more polymers mechanically mixed together but without covalent bonding between them

20. Molecule containing a highly reactive unpaired electron

21. Polymers comprised of two or more different monomers that attach to the chain in long runs of one type of monomer - followed by another monomer AAAAAAAAAAAAABBBBBBBBBBBBBBBBBBAAAAAAAA

22. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...

23. Covalent bonding of the polymer backbone and side groups

24. Is not asymetric and cannot have multiple configurations

25. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern

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