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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. 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






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






3. Simple polymeric material produced as pellets in large quantities






4. Molecule containing a highly reactive unpaired electron






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






6. Atoms attached to the polymer backbone.






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






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






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






10. 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






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






12. 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






13. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings






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






15. 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






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






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






19. 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






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






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






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






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






24. 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






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






26. Double bounded organic molecule used to begin addition polymerization






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






28. An acid and an alcohol






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






30. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern






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






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






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






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






35. Covalent bonding of the polymer backbone and side groups






36. 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






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






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






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






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






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






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






43. Is not asymetric and cannot have multiple configurations






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






46. 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






47. Two or more polymers mechanically mixed together but without covalent bonding between them






48. 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






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






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