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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. Conformation in which the largest substituents are offset by 180






2. 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






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






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






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






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






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






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






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






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






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






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






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






14. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants






15. Number of bonds a molecule has formed






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






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






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






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






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






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






22. Porcess of breaking large organic hydrocarbons into smaller molecules






23. Covalent bonding of the polymer backbone and side groups






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






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






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






27. Relative configuration of adjecent asymmetric carbons






28. Primary raw material for most polymers






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






30. 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






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






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






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






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






35. Atoms attached to the polymer backbone.






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






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






38. 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






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






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






41. 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






42. 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






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






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






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






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






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






48. 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






49. An acid and an alcohol






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