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. Coloring agents that do not dissolve into the polymer






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






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






4. 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






5. Atoms attached to the polymer backbone.






6. Specific arrangements of atoms that cause organic compounds to behave in predictable ways






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






8. 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






9. 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






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






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






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






13. 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






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






15. 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






16. Relative configuration of adjecent asymmetric carbons






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






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






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






20. 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






21. 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






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






23. 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






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






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






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






27. An acid and an alcohol






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






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






30. Number of bonds a molecule has formed






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






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






33. 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






34. Softening agents






35. Simple polymeric material produced as pellets in large quantities






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






37. Molecule containing a highly reactive unpaired electron






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






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






40. Covalent bonding of the polymer backbone and side groups






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






42. 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






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






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






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






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






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






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






49. 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






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