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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. 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






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






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






4. 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






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






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






7. 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






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






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






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






11. 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






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






13. 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






14. Covalent bonding of the polymer backbone and side groups






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






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






17. Coloring agents that do not dissolve into the polymer






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






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






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






21. 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






22. 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






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






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






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






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






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. Atoms attached to the polymer backbone.






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






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






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






32. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






38. Polymer that is made up a single repeat unit






39. 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






40. An acid and an alcohol






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






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






43. 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






44. 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






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






46. 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






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






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






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






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