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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. Molecule containing a highly reactive unpaired electron






2. Polymer that is made up a single repeat unit






3. 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






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






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






6. 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






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






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






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






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






11. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






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






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






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






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






21. Number of bonds a molecule has formed






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






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






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






25. 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






26. Simple polymeric material produced as pellets in large quantities






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






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






29. 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






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






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






32. 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






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






34. 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






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






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






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






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






40. Is not asymetric and cannot have multiple configurations






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






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






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






44. 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






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






46. Double bounded organic molecule used to begin addition polymerization






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. An acid and an alcohol






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






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