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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. Number of repeat/structural units in a polymer chain






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






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






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






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






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






7. 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






8. 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






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






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






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






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






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






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






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






16. An acid and an alcohol






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






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






19. Porcess of breaking large organic hydrocarbons into smaller molecules






20. 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






21. Number of bonds a molecule has formed






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






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






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






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






26. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






32. 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






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






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






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






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






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






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






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






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






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






42. Primary raw material for most polymers






43. 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






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






45. 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






46. Coloring agents that do not dissolve into the polymer






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






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






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






50. 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