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






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






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






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






5. Molecule containing a highly reactive unpaired electron






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






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






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






9. 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






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






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






12. 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






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






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






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






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






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






18. 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






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






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






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






22. Number of bonds a molecule has formed






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






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






25. Atoms attached to the polymer backbone.






26. An acid and an alcohol






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






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






29. 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






30. Primary raw material for most polymers






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






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






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






34. 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






35. Simple polymeric material produced as pellets in large quantities






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






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






38. 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






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






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






41. 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






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






43. 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






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






45. 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






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






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






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






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






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