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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. Porcess of breaking large organic hydrocarbons into smaller molecules






2. 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






3. 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






4. Primary raw material for most polymers






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






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






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






8. 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






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






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






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






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






13. 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






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






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






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






17. 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






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






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






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






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






22. 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






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






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






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






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






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






28. 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






29. Softening agents






30. 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






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






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






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






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






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






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






37. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants






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






39. 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






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






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






42. 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






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






44. Relative configuration of adjecent asymmetric carbons






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






46. Molecule containing a highly reactive unpaired electron






47. An acid and an alcohol






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






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






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