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






2. 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






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






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






5. Softening agents






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






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






8. 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






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






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






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






12. Double bounded organic molecule used to begin addition polymerization






13. Atoms attached to the polymer backbone.






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






15. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






29. 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






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






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






32. 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






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






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






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






36. An acid and an alcohol






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






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






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






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






41. 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






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






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






44. Coloring agents that do not dissolve into the polymer






45. 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






46. Molecule containing a highly reactive unpaired electron






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






48. Polymer that is made up a single repeat unit






49. Covalent bonding of the polymer backbone and side groups






50. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end