Test your basic knowledge |

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. Smallest repeating unit in a polymer. aka repeat unit






2. Polymer that is made up a single repeat unit






3. Atoms attached to the polymer backbone.






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






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






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






7. Relative configuration of adjecent asymmetric carbons






8. 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






9. 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






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






11. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






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






18. 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






19. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






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






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






27. 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






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






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






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






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






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






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






34. Is not asymetric and cannot have multiple configurations






35. 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






36. Number of bonds a molecule has formed






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






38. 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






39. 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






40. Coloring agents that do not dissolve into the polymer






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






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






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






44. Porcess of breaking large organic hydrocarbons into smaller molecules






45. 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






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






47. Pigments or dyes that change the way light is absorbed or reflected by a polymer






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






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






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