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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. Covalent bonding of the polymer backbone and side groups






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






3. 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






4. Simple polymeric material produced as pellets in large quantities






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






6. 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






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






8. Coloring agents that do not dissolve into the polymer






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






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






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






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






13. Is not asymetric and cannot have multiple configurations






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






15. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.






16. 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






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






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






19. Atoms attached to the polymer backbone.






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






21. One type of polymer that contains at least 85% of polyacrylonitrile PAN






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






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






24. 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






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






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






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






29. 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






30. Double bounded organic molecule used to begin addition polymerization






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






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






33. 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






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






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






36. 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






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






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






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






40. Relative configuration of adjecent asymmetric carbons






41. 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






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






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






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






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






46. 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






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






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






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






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