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






2. 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






3. An acid and an alcohol






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






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






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






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






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






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






10. 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






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






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






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






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






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






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






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






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






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






20. 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






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






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






23. Is not asymetric and cannot have multiple configurations






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






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






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






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






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






29. 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






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






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






32. Two or more polymers mechanically mixed together but without covalent bonding between them






33. 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






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






35. Atoms attached to the polymer backbone.






36. Molecule containing a highly reactive unpaired electron






37. Softening agents






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






39. 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






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






41. Coloring agents that do not dissolve into the polymer






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






43. Porcess of breaking large organic hydrocarbons into smaller molecules






44. 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






45. Covalent bonding of the polymer backbone and side groups






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






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






48. Number of bonds a molecule has formed






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






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