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






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






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






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






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






6. 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






7. 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






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






9. Simple polymeric material produced as pellets in large quantities






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






11. 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






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






13. 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






14. Number of bonds a molecule has formed






15. 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






16. Is not asymetric and cannot have multiple configurations






17. 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






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






19. Polymer that is made up a single repeat unit






20. 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






21. Covalent bonding of the polymer backbone and side groups






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






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






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






25. Coloring agents that do not dissolve into the polymer






26. 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






27. Carbon atom capable of multiple configurations due to four different substituents






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






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






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






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






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






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






34. Primary raw material for most polymers






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






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






37. 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






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






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






40. 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






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






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






43. 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






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






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






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






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






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






49. Molecule containing a highly reactive unpaired electron






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