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






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






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






4. Is not asymetric and cannot have multiple configurations






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






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






7. 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






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






9. 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






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






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






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






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






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






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






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






17. 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






18. Atoms attached to the polymer backbone.






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






20. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets






21. 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






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






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






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






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






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






27. 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






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






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






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






31. 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






32. 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






33. An acid and an alcohol






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






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






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






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






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






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






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






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






43. 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






44. Number of bonds a molecule has formed






45. 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






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






47. 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






48. Softening agents






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






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






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