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. Polymer that is made up a single repeat unit






3. Atoms attached to the polymer backbone.






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. Is not asymetric and cannot have multiple configurations






6. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






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






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






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






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






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






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






18. 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






19. 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






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






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






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






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






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






26. 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






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






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






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






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






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






32. 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






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






34. 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






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






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






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






38. 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






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






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






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






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






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






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






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






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






49. An acid and an alcohol






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