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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. 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






2. 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






3. 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






4. 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






5. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color






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






7. 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






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






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






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






11. Is not asymetric and cannot have multiple configurations






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






13. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






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






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






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






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






23. 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






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






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






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






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. Relative configuration of adjecent asymmetric carbons






29. Configuration of a substituent in a polymer - in which the substituent is located on the same side of the polymer chain in all repeating units






30. 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






31. 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






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






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






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






35. 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






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






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






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






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






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






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






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






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






45. Simple polymeric material produced as pellets in large quantities






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






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






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






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






50. Double bounded organic molecule used to begin addition polymerization