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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. 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






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






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






4. Double bounded organic molecule used to begin addition polymerization






5. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






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






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






13. 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






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






15. Simple polymeric material produced as pellets in large quantities






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






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






18. 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






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






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






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






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






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






24. 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






25. 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






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






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






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






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






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






31. An acid and an alcohol






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






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






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






35. 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






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






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






38. 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






39. Is not asymetric and cannot have multiple configurations






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






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






43. 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






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






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






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






47. Coloring agents that do not dissolve into the polymer






48. 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






49. 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






50. Number of bonds a molecule has formed