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






2. 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






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






4. Number of bonds a molecule has formed






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






6. An acid and an alcohol






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






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






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






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






11. Covalent bonding of the polymer backbone and side groups






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






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






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






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






16. 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






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






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






19. Simple polymeric material produced as pellets in large quantities






20. Double bounded organic molecule used to begin addition polymerization






21. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






26. 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






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






28. 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






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






30. 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






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






32. 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






33. 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






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






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






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






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






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






39. 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






40. Molecule containing a highly reactive unpaired electron






41. 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






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






43. 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






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






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






46. Atoms attached to the polymer backbone.






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






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






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






50. Is not asymetric and cannot have multiple configurations