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






2. 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






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






4. Polymer that is made up a single repeat unit






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






6. 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






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






8. Coloring agents that do not dissolve into the polymer






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






10. 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






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






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






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






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






15. Is not asymetric and cannot have multiple configurations






16. 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






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






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






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






20. 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






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






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






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






24. Atoms attached to the polymer backbone.






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






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






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






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






29. Conformation in which the largest substituents are offset by 180






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






31. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






36. 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






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






38. 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






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






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






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






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






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






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






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






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






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






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






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






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