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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 side chains along the backbone; presence of branches disrupts the interactions beween adjacent chains; lowering the tensile strength - melting point - stiffness - crystallinity - and density






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






3. Covalent bonding of the polymer backbone and side groups






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






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






6. Double bounded organic molecule used to begin addition polymerization






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






8. 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






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






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






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






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






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






14. 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






15. Polymer that is made up a single repeat unit






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






17. 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






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






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






20. Number of bonds a molecule has formed






21. 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






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






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






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






25. 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






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






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






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






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






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






31. Porcess of breaking large organic hydrocarbons into smaller molecules






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






33. 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






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






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






36. 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






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






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






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






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






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






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






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






44. 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






45. Primary raw material for most polymers






46. Softening agents






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






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






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






50. Coloring agents that do not dissolve into the polymer