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Modern Material Science And Engineering 2

Subject : engineering
Instructions:
  • Answer 50 questions in 20 minutes. 2 minutes extra for reading the instructions.
  • 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. 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






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






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






4. 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






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






6. Softening agents






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






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






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






10. 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






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






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






13. 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






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






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






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






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






18. Relative configuration of adjecent asymmetric carbons






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






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






21. Polymer that is made up a single repeat unit






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






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






24. 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






25. 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






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






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






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






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






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






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






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






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






34. Primary raw material for most polymers






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






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






38. 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






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






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






41. 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






42. 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






43. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






46. An acid and an alcohol






47. Number of bonds a molecule has formed






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






49. Is not asymetric and cannot have multiple configurations






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