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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. 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






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






3. 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






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






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






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






7. 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






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






9. Molecule containing a highly reactive unpaired electron






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






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






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






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






14. Coloring agents that do not dissolve into the polymer






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






16. 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






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






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






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






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






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






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






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






24. 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






25. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






28. Simple polymeric material produced as pellets in large quantities






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






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






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






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






33. 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






34. Number of bonds a molecule has formed






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






36. 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






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






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






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






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






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






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






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






44. Polymer that is made up a single repeat unit






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






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






47. 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






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. 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






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