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






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






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






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






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






6. 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






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






8. 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






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






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






11. Double bounded organic molecule used to begin addition polymerization






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






13. 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






14. Covalent bonding of the polymer backbone and side groups






15. Softening agents






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






17. Polymer that is made up a single repeat unit






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






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






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






21. Molecule containing a highly reactive unpaired electron






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






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






24. 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






25. Number of bonds a molecule has formed






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






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






29. 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






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






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






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






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






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






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






36. Is not asymetric and cannot have multiple configurations






37. Primary raw material for most polymers






38. 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






39. Atoms attached to the polymer backbone.






40. 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






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






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






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






44. Porcess of breaking large organic hydrocarbons into smaller molecules






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






46. 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






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






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






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






50. An acid and an alcohol