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






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






3. 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






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






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






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






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






8. Polymer made up of two of more differenet monomers covalently bonded together






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






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






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






12. 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






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






14. Porcess of breaking large organic hydrocarbons into smaller molecules






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






16. Relative configuration of adjecent asymmetric carbons






17. 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






18. Number of bonds a molecule has formed






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






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






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






22. Simple polymeric material produced as pellets in large quantities






23. Softening agents






24. 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






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






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






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






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






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






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






31. 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






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






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






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






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






36. 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






37. Molecule containing a highly reactive unpaired electron






38. Coloring agents that do not dissolve into the polymer






39. 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






40. Configuration of a substituent in a polymer - in which the substituent is located on the same side of the polymer chain in all repeating units






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






42. Part of the polymer processing apparatus through which the polymer is pushed - causing the polymer to form a simple shape - such as a rod or tube






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






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






45. Is not asymetric and cannot have multiple configurations






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






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






48. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit






49. Polymer that is made up a single repeat unit






50. 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