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. Softening agents






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






3. 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






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






5. 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






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






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






8. Coloring agents that do not dissolve into the polymer






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






10. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






13. Number of bonds a molecule has formed






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






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






16. 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






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






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






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






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






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






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






23. 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






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






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






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






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. 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






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






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






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






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






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






34. 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






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






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






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






38. Is not asymetric and cannot have multiple configurations






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






40. 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






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






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






43. 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






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






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






46. Covalent bonding of the polymer backbone and side groups






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






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






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






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