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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. Simple polymeric material produced as pellets in large quantities






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






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






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






5. An acid and an alcohol






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






7. 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






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






9. Molecule containing a highly reactive unpaired electron






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






11. 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






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






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






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






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






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






17. 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






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






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






20. Relative configuration of adjecent asymmetric carbons






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






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






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






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






25. 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






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






27. Double bounded organic molecule used to begin addition polymerization






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






29. Is not asymetric and cannot have multiple configurations






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






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






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






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






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






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






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






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






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






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






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






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






42. 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






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






44. 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






45. Number of bonds a molecule has formed






46. Atoms attached to the polymer backbone.






47. 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






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






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






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