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






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






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






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






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






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






7. 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






8. Number of bonds a molecule has formed






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






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






11. 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






12. 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






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






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






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






16. Simple polymeric material produced as pellets in large quantities






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






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






19. 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






20. 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






21. 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






22. 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






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






24. Double bounded organic molecule used to begin addition polymerization






25. 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






26. 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






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






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






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






30. Primary raw material for most polymers






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






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






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






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






35. Molecule containing a highly reactive unpaired electron






36. Is not asymetric and cannot have multiple configurations






37. 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






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






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






40. 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






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






42. Covalent bonding of the polymer backbone and side groups






43. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






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






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