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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. 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






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






3. 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






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






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






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






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






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






9. 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






10. Atoms attached to the polymer backbone.






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






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






13. 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






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






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






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






17. 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






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






19. Primary raw material for most polymers






20. Relative configuration of adjecent asymmetric carbons






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






22. 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






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






24. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern






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






26. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret






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






28. 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






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






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






31. 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






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






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






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






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






36. Simple polymeric material produced as pellets in large quantities






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






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






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






40. Molecule containing a highly reactive unpaired electron






41. 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






42. Covalently bonded chains of molecules with small monomer units repeated from end to end






43. Coloring agents that do not dissolve into the polymer






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






45. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






48. 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






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






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