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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. Primary raw material for most polymers






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






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






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






5. 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






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






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






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






9. 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






10. Porcess of breaking large organic hydrocarbons into smaller molecules






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






12. Is not asymetric and cannot have multiple configurations






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






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






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






16. 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






17. 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






18. Softening agents






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






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






21. 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






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






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






24. Molecule containing a highly reactive unpaired electron






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






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






27. 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






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






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






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






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






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






33. Atoms attached to the polymer backbone.






34. 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






35. An acid and an alcohol






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






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






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






39. 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






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






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






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






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






45. Formation of a polymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chain. this reaction also forms a byproduct - which is typically water






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






47. Covalent bonding of the polymer backbone and side groups






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






49. Simple polymeric material produced as pellets in large quantities






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