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






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






3. 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






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






5. An acid and an alcohol






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






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






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






9. Coloring agents that do not dissolve into the polymer






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






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






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. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.






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






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






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






17. 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






18. Primary raw material for most polymers






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






20. Is not asymetric and cannot have multiple configurations






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






22. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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. Double bounded organic molecule used to begin addition polymerization






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






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






31. Covalent bonding of the polymer backbone and side groups






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






33. 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






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






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






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






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






39. 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






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






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






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






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






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






45. Polymers that contain amide (- N-) groups in the chain






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






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






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






49. Number of bonds a molecule has formed






50. 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