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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. Atoms attached to the polymer backbone.






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






3. 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






4. Porcess of breaking large organic hydrocarbons into smaller molecules






5. Double bounded organic molecule used to begin addition polymerization






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






7. 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






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






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






10. 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






11. 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






12. 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






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






14. 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






15. 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






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






17. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






23. An acid and an alcohol






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






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






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






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






28. 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






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






30. Polymer that is made up a single repeat unit






31. 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






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






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






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






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






36. 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






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






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






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






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






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






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






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






44. Relative configuration of adjecent asymmetric carbons






45. Is not asymetric and cannot have multiple configurations






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






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






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






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






50. 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