Test your basic knowledge |

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






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






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






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






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






6. 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






7. 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






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






9. 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






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






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






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






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






14. 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






15. Primary raw material for most polymers






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






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






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






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






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






24. Double bounded organic molecule used to begin addition polymerization






25. 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






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






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






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






29. Simple polymeric material produced as pellets in large quantities






30. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain






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






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






33. Relative configuration of adjecent asymmetric carbons






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






35. Is not asymetric and cannot have multiple configurations






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






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






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. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






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






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






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






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






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






50. Softening agents