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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. 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






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






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






4. Molecule containing a highly reactive unpaired electron






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






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






7. 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






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






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






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






11. 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






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






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






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






15. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants






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






17. 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






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






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






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






21. 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






22. 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






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






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






25. Is not asymetric and cannot have multiple configurations






26. 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






27. Primary raw material for most polymers






28. 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






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






30. Atoms attached to the polymer backbone.






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






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






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






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






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






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






38. 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






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






40. An acid and an alcohol






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






42. Softening agents






43. 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






44. Porcess of breaking large organic hydrocarbons into smaller molecules






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






46. 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






47. 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






48. 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






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






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