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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. Simple polymeric material produced as pellets in large quantities






2. 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






3. Atoms attached to the polymer backbone.






4. Number of bonds a molecule has formed






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






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






7. Polymer that is made up a single repeat unit






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






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






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






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






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






13. Primary raw material for most polymers






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






15. 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






16. Double bounded organic molecule used to begin addition polymerization






17. Is not asymetric and cannot have multiple configurations






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






19. 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






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






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






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






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






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






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






26. 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






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






28. Relative configuration of adjecent asymmetric carbons






29. 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






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






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






32. Softening agents






33. 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






34. An acid and an alcohol






35. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer






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






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






38. 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






39. Coloring agents that do not dissolve into the polymer






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






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






42. 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






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






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






45. Covalent bonding of the polymer backbone and side groups






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






47. 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






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






49. Molecule containing a highly reactive unpaired electron






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