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






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






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






4. 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






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






6. Softening agents






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






8. Porcess of breaking large organic hydrocarbons into smaller molecules






9. 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






10. 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






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






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






13. Atoms attached to the polymer backbone.






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






15. 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






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






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






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






19. Covalent bonding of the polymer backbone and side groups






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






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






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






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






24. Number of bonds a molecule has formed






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






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






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






28. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






34. Relative configuration of adjecent asymmetric carbons






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






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






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






38. Form of the molecular weight of a sample of polymer chains determined by dividing the mass of the specimen by total number of mols present; always less than weight average molecular weight; all molecules regardless of size correlate well with Mn






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






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






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






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






43. 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






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






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






46. Simple polymeric material produced as pellets in large quantities






47. 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






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






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






50. 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