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






2. Coloring agents that do not dissolve into the polymer






3. Is not asymetric and cannot have multiple configurations






4. Number of bonds a molecule has formed






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






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






7. 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






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






9. 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






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. Conformation in which the largest substituents are offset by 180






12. 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






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






14. 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






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






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






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






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






19. Molecule containing a highly reactive unpaired electron






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






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






22. Double bounded organic molecule used to begin addition polymerization






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






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






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






26. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group






27. Pigments or dyes that change the way light is absorbed or reflected by a polymer






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






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






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






31. 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






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






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






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






35. 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






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






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






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






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






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






41. 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






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






43. 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






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






45. 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






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






47. 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






48. 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






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






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






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