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






2. 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






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






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






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






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






7. 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






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






9. Number of bonds a molecule has formed






10. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






15. Atoms attached to the polymer backbone.






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






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






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






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






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






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






22. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






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






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






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






31. Is not asymetric and cannot have multiple configurations






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






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






34. 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






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






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






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






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






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






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






41. 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






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






44. 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






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






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






47. 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






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. 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






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