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. An acid and an alcohol






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






3. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






9. 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






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






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






12. Covalent bonding of the polymer backbone and side groups






13. 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






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






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






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






17. Is not asymetric and cannot have multiple configurations






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






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






20. 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






21. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color






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






23. 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






24. Primary raw material for most polymers






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






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






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






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






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






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






31. 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






32. Porcess of breaking large organic hydrocarbons into smaller molecules






33. 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






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






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






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






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






38. Atoms attached to the polymer backbone.






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






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






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






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






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






44. Relative configuration of adjecent asymmetric carbons






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






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






47. 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






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






49. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance






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