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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 that is made up a single repeat unit






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






3. Number of bonds a molecule has formed






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






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






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






7. 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






8. An acid and an alcohol






9. Primary raw material for most polymers






10. 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






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






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






13. 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






14. 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






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






16. 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






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






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






19. 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






20. Is not asymetric and cannot have multiple configurations






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






22. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination






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






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






25. 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






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






27. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property






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






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






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






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






32. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain






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






34. Atoms attached to the polymer backbone.






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






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






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






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






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






41. Coloring agents that do not dissolve into the polymer






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






43. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color






44. Relative configuration of adjecent asymmetric carbons






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






46. 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






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






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






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






50. Double bounded organic molecule used to begin addition polymerization