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






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






3. Polymer that is made up a single repeat unit






4. 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






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






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






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






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






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






10. Simple polymeric material produced as pellets in large quantities






11. 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






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






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






14. Coloring agents that do not dissolve into the polymer






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






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






17. 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






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






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






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






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. Broad category of polymers that includes polymers containing urethane linkages






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






24. Relative configuration of adjecent asymmetric carbons






25. Molecule containing a highly reactive unpaired electron






26. Number of repeat/structural units in a polymer chain






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






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






29. 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






30. Atoms attached to the polymer backbone.






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






32. 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






33. 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






34. Primary raw material for most polymers






35. 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






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






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






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






39. Porcess of breaking large organic hydrocarbons into smaller molecules






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






41. 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






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






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






44. 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






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






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






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






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






49. Softening agents






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