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






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






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






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






5. Porcess of breaking large organic hydrocarbons into smaller molecules






6. 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






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






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






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






10. 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






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






12. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






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






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






20. 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






21. 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






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






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






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






25. 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






26. Molecule containing a highly reactive unpaired electron






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






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






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






30. 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






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






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






33. Atoms attached to the polymer backbone.






34. 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






35. Primary raw material for most polymers






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






37. 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






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






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






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






41. 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






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






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






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






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






46. 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






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






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






49. Broad category of polymers that includes polymers containing urethane linkages






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