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






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






3. 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






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






5. Number of bonds a molecule has formed






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






7. Relative configuration of adjecent asymmetric carbons






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






9. Coloring agents that do not dissolve into the polymer






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






11. 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






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






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






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






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






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






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






18. 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






19. Simple polymeric material produced as pellets in large quantities






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






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






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






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






24. 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






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






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






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






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






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






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






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






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






33. 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






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






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






36. 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






37. Long chain polymers that contain at least 85% of an ester of a substituted aromatic carboxylic acid. these fibers are strong and can dyed or made transpared






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






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






40. Is not asymetric and cannot have multiple configurations






41. 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






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. 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






44. 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






45. Double bounded organic molecule used to begin addition polymerization






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






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






48. Molecule containing a highly reactive unpaired electron






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






50. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device