Test your basic knowledge |

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






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






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






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






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






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






7. An acid and an alcohol






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






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






10. 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






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






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






13. Softening agents






14. Double bounded organic molecule used to begin addition polymerization






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






16. 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






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






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






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






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






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






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






24. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air






25. 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






26. Primary raw material for most polymers






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






28. 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






29. 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






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






31. Molecule containing a highly reactive unpaired electron






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






33. 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






34. Is not asymetric and cannot have multiple configurations






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






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






37. Specific arrangements of atoms that cause organic compounds to behave in predictable ways






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






39. Porcess of breaking large organic hydrocarbons into smaller molecules






40. Part of the extrusion apparatus that contains a heated screw which is used to melt the polymer and the polymer forward into the next chamber






41. Simple polymeric material produced as pellets in large quantities






42. 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






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






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






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






46. 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






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






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






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






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