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






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






3. Molecule containing a highly reactive unpaired electron






4. 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






5. Number of bonds a molecule has formed






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






7. Porcess of breaking large organic hydrocarbons into smaller molecules






8. 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






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






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






11. Carbon atom capable of multiple configurations due to four different substituents






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






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






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






15. Double bounded organic molecule used to begin addition polymerization






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






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






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






19. 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






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






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






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






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






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






25. 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






26. 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






27. Polymer that is made up a single repeat unit






28. Covalent bonding of the polymer backbone and side groups






29. 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






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






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






32. 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






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






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






35. Simple polymeric material produced as pellets in large quantities






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






37. 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






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






39. 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






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






41. Coloring agents that do not dissolve into the polymer






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






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






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






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






46. 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






47. Atoms attached to the polymer backbone.






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






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






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