Test your basic knowledge |

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 that contain amide (- N-) groups in the chain






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






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






4. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






10. 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






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






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






13. Primary raw material for most polymers






14. An acid and an alcohol






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






16. Molecule containing a highly reactive unpaired electron






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






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






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






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






21. Covalent bonding of the polymer backbone and side groups






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






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






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






25. 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






26. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals






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






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






29. 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






30. Part of the extrusion apparatus that contains a heated screw which is used to melt the polymer and the polymer forward into the next chamber






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






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






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






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






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






36. 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






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






38. Relative configuration of adjecent asymmetric carbons






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






40. Long chain polymers that contain at least 85% of an ester of a substituted aromatic carboxylic acid. these fibers are strong and can dyed or made transpared






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






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






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






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






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






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






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






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






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






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