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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. Is not asymetric and cannot have multiple configurations






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






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






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






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






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






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






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






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






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






11. Molecule containing a highly reactive unpaired electron






12. Covalent bonding of the polymer backbone and side groups






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






14. 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






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






16. Polymer that is made up a single repeat unit






17. Number of bonds a molecule has formed






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






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






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






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






22. 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






23. 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






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






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






26. Primary raw material for most polymers






27. 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






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






29. Porcess of breaking large organic hydrocarbons into smaller molecules






30. Coloring agents that do not dissolve into the polymer






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






32. 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






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






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






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






36. An acid and an alcohol






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






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






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






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






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






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






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






44. 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






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






46. Relative configuration of adjecent asymmetric carbons






47. 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






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






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






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