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






2. 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






3. 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






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






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. Double bounded organic molecule used to begin addition polymerization






7. 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






8. An acid and an alcohol






9. Polymer that is made up a single repeat unit






10. Coloring agents that do not dissolve into the polymer






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






12. 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






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






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






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






16. 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






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






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






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






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






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






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






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






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






25. 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






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






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






28. 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






29. Covalent bonding of the polymer backbone and side groups






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






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






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






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






34. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer






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






36. Atoms attached to the polymer backbone.






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






38. Number of bonds a molecule has formed






39. 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






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






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






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






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






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






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






46. 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






47. 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






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






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






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