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






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






3. 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






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






5. Is not asymetric and cannot have multiple configurations






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






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






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






9. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light






10. An acid and an alcohol






11. Simple polymeric material produced as pellets in large quantities






12. Double bounded organic molecule used to begin addition polymerization






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






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






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






16. 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






17. Relative configuration of adjecent asymmetric carbons






18. 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






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






20. 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






21. 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






22. 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






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






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






25. Covalent bonding of the polymer backbone and side groups






26. 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






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






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






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






30. 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






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






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






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






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






35. Carbon atom capable of multiple configurations due to four different substituents






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






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






38. Primary raw material for most polymers






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






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






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






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






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






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






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






46. Porcess of breaking large organic hydrocarbons into smaller molecules






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






48. Molecule containing a highly reactive unpaired electron






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






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