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. 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






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






3. Simple polymeric material produced as pellets in large quantities






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






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






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






7. Polymer that is made up a single repeat unit






8. Atoms attached to the polymer backbone.






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






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






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






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






13. An acid and an alcohol






14. 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






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






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






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






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






19. 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






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






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






22. Primary raw material for most polymers






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






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






25. 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






26. Relative configuration of adjecent asymmetric carbons






27. 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






28. 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






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






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






31. 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






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






33. Double bounded organic molecule used to begin addition polymerization






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






35. 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






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






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






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






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






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






41. Softening agents






42. 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






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






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






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






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






47. Covalent bonding of the polymer backbone and side groups






48. 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






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






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