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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. 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






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






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






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






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






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






7. 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






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






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






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






11. Simple polymeric material produced as pellets in large quantities






12. Covalent bonding of the polymer backbone and side groups






13. 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






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






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






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






17. Coloring agents that do not dissolve into the polymer






18. 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






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






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






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






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






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






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






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






26. Polymer that is made up a single repeat unit






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






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






29. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow






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






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






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






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






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






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






36. 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






37. 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






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






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






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






41. Is not asymetric and cannot have multiple configurations






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






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






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






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






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






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






48. An acid and an alcohol






49. Relative configuration of adjecent asymmetric carbons






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