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






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






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






4. An acid and an alcohol






5. Number of bonds a molecule has formed






6. 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






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






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






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






10. 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






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






12. 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






13. 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






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






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






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






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






18. 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






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






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






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






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






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






24. 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






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






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






27. Is not asymetric and cannot have multiple configurations






28. Polymer that is made up a single repeat unit






29. Simple polymeric material produced as pellets in large quantities






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






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






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






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






34. 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






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






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






37. Relative configuration of adjecent asymmetric carbons






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






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






40. Covalent bonding of the polymer backbone and side groups






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






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






43. 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






44. Atoms attached to the polymer backbone.






45. 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






46. 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






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






48. 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






49. Molecule containing a highly reactive unpaired electron






50. Primary raw material for most polymers