Test your basic knowledge |

Modern Material Science And Engineering 2

Subject : engineering
Instructions:
  • Answer 50 questions in 20 minutes. 1 minute extra for reading the instructions.
  • 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. 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






3. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination






4. 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






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. Molecule containing a highly reactive unpaired electron






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






8. Softening agents






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






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






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






12. An acid and an alcohol






13. Primary raw material for most polymers






14. 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






15. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






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






22. Number of bonds a molecule has formed






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






24. 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






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






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






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






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






29. Porcess of breaking large organic hydrocarbons into smaller molecules






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






31. Simple polymeric material produced as pellets in large quantities






32. Covalent bonding of the polymer backbone and side groups






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






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






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






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






38. 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






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






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






41. 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






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






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






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






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






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






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






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






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