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






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






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






5. Molecule containing a highly reactive unpaired electron






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






7. 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






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






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






10. 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






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






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






13. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color






14. Covalent bonding of the polymer backbone and side groups






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






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






17. 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






18. Softening agents






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






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






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






22. One type of polymer that contains at least 85% of polyacrylonitrile PAN






23. 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






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






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






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






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






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






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






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






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






32. 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






33. 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






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






35. 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






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






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






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






39. 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






40. 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






41. Is not asymetric and cannot have multiple configurations






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






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






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






45. Polymer made up of two of more differenet monomers covalently bonded together






46. Number of bonds a molecule has formed






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






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






49. 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






50. Primary raw material for most polymers