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






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






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






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






5. Number of bonds a molecule has formed






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






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






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






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






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






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






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






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






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






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






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






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






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






19. 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






20. 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






21. 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






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






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






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






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






26. 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






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






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






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






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






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






32. 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






33. Primary raw material for most polymers






34. Coloring agents that do not dissolve into the polymer






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






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






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






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






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






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






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






42. 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






43. 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






44. Polymer that is made up a single repeat unit






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






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






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






48. Simple polymeric material produced as pellets in large quantities






49. 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






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