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






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






3. Softening agents






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






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






6. 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






7. 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






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






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






10. 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






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






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






13. Is not asymetric and cannot have multiple configurations






14. Molecule containing a highly reactive unpaired electron






15. 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






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






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






18. 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






19. Primary raw material for most polymers






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






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






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






23. Covalent bonding of the polymer backbone and side groups






24. 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






25. Atoms attached to the polymer backbone.






26. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






32. 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






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






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






35. Coloring agents that do not dissolve into the polymer






36. Simple polymeric material produced as pellets in large quantities






37. 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






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






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






40. 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






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






42. 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






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






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






45. 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






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






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






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






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






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