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






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






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. 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






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






6. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






11. An acid and an alcohol






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






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






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






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






16. Simple polymeric material produced as pellets in large quantities






17. 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






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






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






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






21. 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






22. Polymer that is made up a single repeat unit






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






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






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. 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






27. 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






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






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






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






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






32. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






38. Number of bonds a molecule has formed






39. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer






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






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






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






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






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






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






46. 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






47. Molecule containing a highly reactive unpaired electron






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






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






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