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






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






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






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






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






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






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






8. Simple polymeric material produced as pellets in large quantities






9. 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






10. 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






11. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






14. Is not asymetric and cannot have multiple configurations






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






16. Polymer that is made up a single repeat unit






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






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






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






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






21. Atoms attached to the polymer backbone.






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






23. An acid and an alcohol






24. 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






25. 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






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






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






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






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






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






31. 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






32. Formation of a plymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chains. this reaction also forms a biproduct - usually water






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






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






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






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






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






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






39. 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






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






41. 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






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






43. 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






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






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






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






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






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






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






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