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






2. 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






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






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






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






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






7. Atoms attached to the polymer backbone.






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






9. 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






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






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






12. 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






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






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






15. 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






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






17. An acid and an alcohol






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






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






20. 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






21. 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






22. Porcess of breaking large organic hydrocarbons into smaller molecules






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






24. Molecule containing a highly reactive unpaired electron






25. Covalent bonding of the polymer backbone and side groups






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






27. 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






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






29. 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






30. Relative configuration of adjecent asymmetric carbons






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






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






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






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






35. Is not asymetric and cannot have multiple configurations






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






37. Polymer that is made up a single repeat unit






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






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






40. Number of bonds a molecule has formed






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






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






43. Primary raw material for most polymers






44. Softening agents






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






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






47. Simple polymeric material produced as pellets in large quantities






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






49. 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






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