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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. Covalent bonding of the polymer backbone and side groups






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






3. Atoms attached to the polymer backbone.






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






5. 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






6. 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






7. Polymer that is made up a single repeat unit






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






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






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






11. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






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






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






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






20. 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






21. 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






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






23. Coloring agents that do not dissolve into the polymer






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






25. Number of bonds a molecule has formed






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






27. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






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






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






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






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






37. 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






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






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






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






41. Formation of a plymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chains. this reaction also forms a biproduct - usually water






42. Double bounded organic molecule used to begin addition polymerization






43. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






48. 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






49. 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






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