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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. Simple polymeric material produced as pellets in large quantities






2. 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






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






4. Atoms attached to the polymer backbone.






5. Primary raw material for most polymers






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






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






8. 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






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






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






11. Covalent bonding of the polymer backbone and side groups






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






13. 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






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






15. Softening agents






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






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






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






19. 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






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






21. 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






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






23. Polymer that is made up a single repeat unit






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






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






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






29. 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






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






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






32. 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






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






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






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






36. Molecule containing a highly reactive unpaired electron






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






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






39. 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






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






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






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






43. 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






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






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






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






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






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






49. Coloring agents that do not dissolve into the polymer






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