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






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






4. 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






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






6. Primary raw material for most polymers






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






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






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






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






11. 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






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






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






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






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






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






17. Coloring agents that do not dissolve into the polymer






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






19. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern






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






21. 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






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






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






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






25. Softening agents






26. Simple polymeric material produced as pellets in large quantities






27. 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






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






29. 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






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






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






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






33. An acid and an alcohol






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






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






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






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






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






39. Double bounded organic molecule used to begin addition polymerization






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






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






42. 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






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






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






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






46. 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






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






48. Porcess of breaking large organic hydrocarbons into smaller molecules






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






50. Relative configuration of adjecent asymmetric carbons