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






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






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






4. 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






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






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






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






8. 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






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






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






11. 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






12. 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






13. Long chain polymers that contain at least 85% of an ester of a substituted aromatic carboxylic acid. these fibers are strong and can dyed or made transpared






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






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






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






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






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






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






20. 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






21. 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






22. 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






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






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






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






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






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






28. 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






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






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






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






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






33. Porcess of breaking large organic hydrocarbons into smaller molecules






34. 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






35. 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






36. Softening agents






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






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






39. Is not asymetric and cannot have multiple configurations






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






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






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






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






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






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






46. Primary raw material for most polymers






47. 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






48. An acid and an alcohol






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






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