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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. Primary raw material for most polymers






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






3. Double bounded organic molecule used to begin addition polymerization






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






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






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






7. 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






8. An acid and an alcohol






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






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






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






12. 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






13. Conformation that occurs when the largest substituent in a molecule are offset by 60






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






15. Molecule containing a highly reactive unpaired electron






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






17. 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






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






19. Softening agents






20. 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






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






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






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






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






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






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






27. 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






28. Porcess of breaking large organic hydrocarbons into smaller molecules






29. 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






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






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






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






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






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






35. Is not asymetric and cannot have multiple configurations






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






37. 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






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






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






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






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






42. Number of bonds a molecule has formed






43. 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






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






45. 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






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






47. 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






48. 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






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






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