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






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






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






5. 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






6. Atoms attached to the polymer backbone.






7. Number of bonds a molecule has formed






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






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






10. Primary raw material for most polymers






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






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






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






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






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






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






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






18. 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






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






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






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






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






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






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






25. Double bounded organic molecule used to begin addition polymerization






26. 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






27. Porcess of breaking large organic hydrocarbons into smaller molecules






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






29. 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






30. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains






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






32. Relative configuration of adjecent asymmetric carbons






33. Softening agents






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






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






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






37. 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






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






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






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






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






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






43. Is not asymetric and cannot have multiple configurations






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






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






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






47. Coloring agents that do not dissolve into the polymer






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






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






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