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






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






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






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






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






6. 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






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






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






9. 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






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






11. 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






12. Polymer that is made up a single repeat unit






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






14. 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






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






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






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






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






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






20. 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






21. Coloring agents that do not dissolve into the polymer






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






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






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. Double bounded organic molecule used to begin addition polymerization






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






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






29. 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






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






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






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






33. 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






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






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






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






37. 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






38. 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






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






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






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






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






43. Number of bonds a molecule has formed






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






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






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






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






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






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






50. 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