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






2. Simple polymeric material produced as pellets in large quantities






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






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






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






6. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds






7. Is not asymetric and cannot have multiple configurations






8. Softening agents






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






10. Second- order thermodynamic transition in which the onset of large scale chain mobility occures in polymers. Bellow Tg the polymer is glasslike and brittle. above Tg the polymer becomes rubbery and flexible






11. Atoms attached to the polymer backbone.






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






13. Relative configuration of adjecent asymmetric carbons






14. Polymer that is made up a single repeat unit






15. An acid and an alcohol






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






17. 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






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






19. 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






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






21. 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






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






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






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






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






26. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel






27. Primary raw material for most polymers






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






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






30. Double bounded organic molecule used to begin addition polymerization






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






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






33. Coloring agents that do not dissolve into the polymer






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






35. 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






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






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






38. 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






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






40. Porcess of breaking large organic hydrocarbons into smaller molecules






41. 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






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






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






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






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






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






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






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






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






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






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