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






2. Polymer that is made up a single repeat unit






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






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






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






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






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






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






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






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






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






12. 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






13. Coloring agents that do not dissolve into the polymer






14. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






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. 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






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






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






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






25. 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






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






27. Atoms attached to the polymer backbone.






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






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






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






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






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






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






34. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret






35. 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






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






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






38. 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






39. 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






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






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






43. 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






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






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






46. Covalent bonding of the polymer backbone and side groups






47. Is not asymetric and cannot have multiple configurations






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






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






50. Number of bonds a molecule has formed