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






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






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






4. Is not asymetric and cannot have multiple configurations






5. Simple polymeric material produced as pellets in large quantities






6. Covalent bonding of the polymer backbone and side groups






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






8. 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






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






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






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






12. Number of bonds a molecule has formed






13. Softening agents






14. 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






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






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






17. Atoms attached to the polymer backbone.






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






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






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






21. 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






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






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






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






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






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






27. 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






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






29. 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






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






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






32. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






38. An acid and an alcohol






39. Porcess of breaking large organic hydrocarbons into smaller molecules






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






41. 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






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






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






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






45. 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






46. 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






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






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






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






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