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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. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






6. Covalent bonding of the polymer backbone and side groups






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






8. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties






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






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






11. Softening agents






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






13. Number of bonds a molecule has formed






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






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






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






17. Coloring agents that do not dissolve into the polymer






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






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






20. 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






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






23. 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






24. 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






25. 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






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






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






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






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






30. 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






31. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






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






38. 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






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






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






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






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






43. 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






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






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






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






47. Relative configuration of adjecent asymmetric carbons






48. 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






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






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