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






2. Softening agents






3. Broad category of polymers that includes polymers containing urethane linkages






4. 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






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






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






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






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






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






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






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






12. 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






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






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






15. Polymer that is made up a single repeat unit






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






17. 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






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






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






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






21. 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






22. Molecule containing a highly reactive unpaired electron






23. Number of bonds a molecule has formed






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






25. 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






26. 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






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






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






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






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






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






32. 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






33. Relative configuration of adjecent asymmetric carbons






34. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...






35. 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






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






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






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






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






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






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






42. Atoms attached to the polymer backbone.






43. 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






44. 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






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






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






47. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process






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






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






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