Test your basic knowledge |

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






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






3. 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






4. Double bounded organic molecule used to begin addition polymerization






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






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






7. 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






8. 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






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






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






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






12. 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






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






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






15. 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






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






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






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






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






20. Simple polymeric material produced as pellets in large quantities






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






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






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






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






25. 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






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






27. 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






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






29. Porcess of breaking large organic hydrocarbons into smaller molecules






30. Number of bonds a molecule has formed






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






32. Configuration of a substituent in a polymer - in which the substituent is located on the same side of the polymer chain in all repeating units






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






34. An acid and an alcohol






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






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






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






38. Softening agents






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






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






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






42. Primary raw material for most polymers






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






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






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






46. Molecule containing a highly reactive unpaired electron






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






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. Smallest repeating unit in a polymer. aka repeat unit






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