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






2. Double bounded organic molecule used to begin addition polymerization






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






4. 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






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






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






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






8. Number of bonds a molecule has formed






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






10. 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






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






12. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air






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






14. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants






15. Primary raw material for most polymers






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






17. 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






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






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






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






21. 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






22. Relative configuration of adjecent asymmetric carbons






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






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






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






26. 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






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






28. 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






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






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






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






32. Softening agents






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






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






35. 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






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






37. 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






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






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






40. 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






41. Simple polymeric material produced as pellets in large quantities






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






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






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






45. An acid and an alcohol






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






49. 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






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