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






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






3. Primary raw material for most polymers






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






5. Polymer made up of two of more differenet monomers covalently bonded together






6. 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






7. Number of bonds a molecule has formed






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






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






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






11. 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






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






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






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






15. 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






16. Formation of a polymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chain. this reaction also forms a byproduct - which is typically water






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






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






19. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer






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






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






22. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color






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






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






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






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






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






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






29. 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






30. Process of pushing polymers through a spinneret and winding the solidified fibers onto a tow - which imposes a shear stress on the fibers upstream as they emerge from the spinneret






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






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






33. One of the two different types of termination in the polymerization process. during this type of termination - the free radicals from two different polymer chains join to end the propogation process






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






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






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






37. Polymer that is made up a single repeat unit






38. 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






39. Relative configuration of adjecent asymmetric carbons






40. Simple polymeric material produced as pellets in large quantities






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






42. 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






43. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups






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






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






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






47. Additives whose primary purpose is to reduce the final cost of the product






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






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






50. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret