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






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






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






5. Is not asymetric and cannot have multiple configurations






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






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. 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






9. 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






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






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






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






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






14. 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






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






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






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






18. 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






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






20. Coloring agents that do not dissolve into the polymer






21. Molecule containing a highly reactive unpaired electron






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






23. 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






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






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






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






27. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance






28. 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






29. Polymer that is made up a single repeat unit






30. Simple polymeric material produced as pellets in large quantities






31. 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






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






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






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






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






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






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






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






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






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






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






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






43. Atoms attached to the polymer backbone.






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






45. 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






46. 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






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






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






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






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