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






2. Simple polymeric material produced as pellets in large quantities






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






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






5. Porcess of breaking large organic hydrocarbons into smaller molecules






6. Polymer that is made up a single repeat unit






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






8. 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






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






10. One type of polymer that contains at least 85% of polyacrylonitrile PAN






11. Pigments or dyes that change the way light is absorbed or reflected by a polymer






12. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion






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






14. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination






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






16. Is not asymetric and cannot have multiple configurations






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






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






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






20. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process






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






22. Term used to represent the average molecular weight of a sample containing a wide range of polymer chain lengths. this term is used to avoid confusion between the number average and the weight molecular average weight






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






24. Covalent bonding of the polymer backbone and side groups






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






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






27. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance






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






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






30. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit






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






32. 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






33. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain






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






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






36. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads






37. Softening agents






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






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






40. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties






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






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






43. 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






44. Formation of side chains along the backbone; presence of branches disrupts the interactions beween adjacent chains; lowering the tensile strength - melting point - stiffness - crystallinity - and density






45. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air






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






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






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






49. Number of bonds a molecule has formed






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