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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. Covalent bonding of the polymer backbone and side groups






2. 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






3. Simple polymeric material produced as pellets in large quantities






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






5. 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






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






7. Softening agents






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






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






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






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






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






13. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






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






20. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...






21. Primary raw material for most polymers






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






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






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






25. 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






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






27. 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






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






29. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






34. 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






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






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






37. Coloring agents that do not dissolve into the polymer






38. 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






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






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






41. An acid and an alcohol






42. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups






43. Is not asymetric and cannot have multiple configurations






44. 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






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






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






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






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






49. 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






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