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






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






3. 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






4. 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






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






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






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






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






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






10. Primary raw material for most polymers






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






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






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






14. 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






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






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






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






18. 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






19. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






25. An acid and an alcohol






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






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






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






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






30. 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






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






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






33. 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






34. Covalent bonding of the polymer backbone and side groups






35. Molecule containing a highly reactive unpaired electron






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






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






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






39. Is not asymetric and cannot have multiple configurations






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






41. Atoms attached to the polymer backbone.






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






43. Relative configuration of adjecent asymmetric carbons






44. 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






45. 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






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






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






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






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






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