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






2. Coloring agents that do not dissolve into the polymer






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






4. Primary raw material for most polymers






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






6. 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






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






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






9. Covalently bonded chains of molecules with small monomer units repeated from end to end






10. Double bounded organic molecule used to begin addition polymerization






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






12. An acid and an alcohol






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






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






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






16. Polymer that is made up a single repeat unit






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






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






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






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






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






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






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






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






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






26. 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






27. Porcess of breaking large organic hydrocarbons into smaller molecules






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






29. 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






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






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






32. 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






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






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






35. 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






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






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






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






39. 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






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






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






42. 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






43. 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






44. 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






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






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






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






48. Molecule containing a highly reactive unpaired electron






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






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