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






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






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






4. Molecule containing a highly reactive unpaired electron






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






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






7. An acid and an alcohol






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






9. Relative configuration of adjecent asymmetric carbons






10. 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






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






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






13. Is not asymetric and cannot have multiple configurations






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






15. Softening agents






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






17. 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






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






19. Simple polymeric material produced as pellets in large quantities






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






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






22. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets






23. 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






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. Polymer that is made up a single repeat unit






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






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






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






29. 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






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






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






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






33. 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






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






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






36. 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






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






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






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






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






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






42. Two or more polymers mechanically mixed together but without covalent bonding between them






43. Number of bonds a molecule has formed






44. 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






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






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






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






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. Primary raw material for most polymers






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