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






2. 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






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






4. Porcess of breaking large organic hydrocarbons into smaller molecules






5. Softening agents






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






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






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






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






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






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






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






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






14. 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






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






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






17. 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






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






19. 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






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






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






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






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






24. An acid and an alcohol






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






26. Number of bonds a molecule has formed






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






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






29. Is not asymetric and cannot have multiple configurations






30. Coloring agents that do not dissolve into the polymer






31. Simple polymeric material produced as pellets in large quantities






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






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






34. Covalent bonding of the polymer backbone and side groups






35. Polymer that is made up a single repeat unit






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






37. 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






38. 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






39. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants






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






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






42. Form of the molecular weight of a sample of polymer chains determined by dividing the mass of the specimen by total number of mols present; always less than weight average molecular weight; all molecules regardless of size correlate well with Mn






43. Atoms attached to the polymer backbone.






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






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






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






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






48. 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






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






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