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Modern Material Science And Engineering 2

Subject : engineering
Instructions:
  • Answer 50 questions in 30 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. An acid and an alcohol






2. 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






3. Number of bonds a molecule has formed






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






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






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






7. Conformation that occurs when the largest substituent in a molecule are offset by 60






8. Is not asymetric and cannot have multiple configurations






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






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






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






12. Coloring agents that do not dissolve into the polymer






13. 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






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






15. 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






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






17. Primary raw material for most polymers






18. Atoms attached to the polymer backbone.






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






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






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






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






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






24. 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






25. 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






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






27. 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






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






29. 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






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






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






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






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






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






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






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






37. Simple polymeric material produced as pellets in large quantities






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






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






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






41. 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






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






43. Relative configuration of adjecent asymmetric carbons






44. 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






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






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






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






48. 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






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






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