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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. Softening agents






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






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






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






5. 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






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






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






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






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






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






11. Is not asymetric and cannot have multiple configurations






12. 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






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






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






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






16. Molecule containing a highly reactive unpaired electron






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






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






19. An acid and an alcohol






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






21. 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






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






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






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






25. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






31. 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






32. 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






33. 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






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






35. 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






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






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






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






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






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






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






42. Simple polymeric material produced as pellets in large quantities






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






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






45. Coloring agents that do not dissolve into the polymer






46. 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






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






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






49. Atoms attached to the polymer backbone.






50. 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