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. An acid and an alcohol






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






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






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






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






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






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






8. 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






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






10. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






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






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






18. 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






19. 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






20. Double bounded organic molecule used to begin addition polymerization






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






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






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






24. Softening agents






25. 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






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






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






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






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






30. Primary raw material for most polymers






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






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






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






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






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






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






37. Relative configuration of adjecent asymmetric carbons






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






39. 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






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






41. 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






42. 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






43. Simple polymeric material produced as pellets in large quantities






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






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






46. Polymer that is made up a single repeat unit






47. 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






48. Number of bonds a molecule has formed






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






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