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






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






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






4. Number of bonds a molecule has formed






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






6. Softening agents






7. 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






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






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






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






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






12. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






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






19. Coloring agents that do not dissolve into the polymer






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






21. An acid and an alcohol






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






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






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






25. Porcess of breaking large organic hydrocarbons into smaller molecules






26. 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






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






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






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






30. 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






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






32. 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






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






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






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






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






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






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. Molecule containing a highly reactive unpaired electron






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






41. One method of expressing the molecular weight of sample of polymers with averaging based on weight; this method is more useful when large molecules in the sample dominate the behavior






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






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






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






45. 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






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






47. Atoms attached to the polymer backbone.






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






49. Primary raw material for most polymers






50. 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