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. Coloring agents that do not dissolve into the polymer






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






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






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






5. Covalent bonding of the polymer backbone and side groups






6. 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






7. Polymer that is made up a single repeat unit






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






9. Primary raw material for most polymers






10. 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






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






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






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






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






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






16. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






20. 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






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






22. 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






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






24. 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






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






26. 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






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






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






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






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






31. 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






32. Molecule containing a highly reactive unpaired electron






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






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






35. Atoms attached to the polymer backbone.






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






37. Number of bonds a molecule has formed






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






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






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






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






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






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






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






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






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






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






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






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