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






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






3. 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






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






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






6. Relative configuration of adjecent asymmetric carbons






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






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






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






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






11. 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






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






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






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






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






17. Atoms attached to the polymer backbone.






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






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






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






21. Is not asymetric and cannot have multiple configurations






22. 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






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






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






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






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






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






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






29. Number of bonds a molecule has formed






30. Polymer that is made up a single repeat unit






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






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






33. 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






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






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






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






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






38. 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






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






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






41. 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






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






43. 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






44. An acid and an alcohol






45. 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






46. Double bounded organic molecule used to begin addition polymerization






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






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






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






50. 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