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






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






3. Primary raw material for most polymers






4. Atoms attached to the polymer backbone.






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






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






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






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






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






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






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






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






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






14. Polymer that is made up a single repeat unit






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






16. 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






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






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






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






20. Relative configuration of adjecent asymmetric carbons






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






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






23. 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






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. Conformation in which the largest substituents are offset by 180






26. Is not asymetric and cannot have multiple configurations






27. Molecule containing a highly reactive unpaired electron






28. 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






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






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






31. 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






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






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






34. 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






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






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






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






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






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






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






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






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






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






44. Porcess of breaking large organic hydrocarbons into smaller molecules






45. 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






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






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






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






49. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow






50. Softening agents