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






2. 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






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






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






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






6. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






11. 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






12. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






28. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device






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






30. 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






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






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






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






34. 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






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






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






37. 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






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






39. 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






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






41. 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






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






43. Is not asymetric and cannot have multiple configurations






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






45. An acid and an alcohol






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






47. 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






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






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






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