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. Primary raw material for most polymers






2. Coloring agents that do not dissolve into the polymer






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






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






5. 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






6. 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






7. 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






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






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






10. An acid and an alcohol






11. Simple polymeric material produced as pellets in large quantities






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






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






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






15. 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






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






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






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






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






20. 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






21. 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






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






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






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






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






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






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






28. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






33. 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






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






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






36. 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






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






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






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






40. 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






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






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






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






44. Covalent bonding of the polymer backbone and side groups






45. 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






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






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






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






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






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