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Modern Material Science And Engineering 2

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups






2. Low- molecular- weight building blocks repeated in the polymer chain






3. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed






4. An acid and an alcohol






5. Softening agents






6. Number of repeat/structural units in a polymer chain






7. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants






8. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group






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






10. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly






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






12. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.






13. Molecule containing a highly reactive unpaired electron






14. Polymers that contain amide (- N-) groups in the chain






15. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device






16. Relative configuration of adjecent asymmetric carbons






17. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains






18. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants






19. 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






20. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.






21. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light






22. Covalent bonding of the polymer backbone and side groups






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






24. Conformation that occurs when the largest substituent in a molecule are offset by 60






25. Number of bonds a molecule has formed






26. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties






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






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






29. Simple polymeric material produced as pellets in large quantities






30. Specific arrangements of atoms that cause organic compounds to behave in predictable ways






31. Atoms attached to the polymer backbone.






32. Second- order thermodynamic transition in which the onset of large scale chain mobility occures in polymers. Bellow Tg the polymer is glasslike and brittle. above Tg the polymer becomes rubbery and flexible






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






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






35. Configuration of a substituent in a polymer - in which the substituent is located on the same side of the polymer chain in all repeating units






36. Covalently bonded chains of molecules with small monomer units repeated from end to end






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






38. Carbon atom capable of multiple configurations due to four different substituents






39. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)






40. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer






41. Is not asymetric and cannot have multiple configurations






42. Broad category of polymers that includes polymers containing urethane linkages






43. Form of the molecular weight of a sample of polymer chains determined by dividing the mass of the specimen by total number of mols present; always less than weight average molecular weight; all molecules regardless of size correlate well with Mn






44. 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






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






46. Formation of a plymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chains. this reaction also forms a biproduct - usually water






47. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings






48. Part of the polymer processing apparatus through which the polymer is pushed - causing the polymer to form a simple shape - such as a rod or tube






49. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit






50. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group