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






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






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






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






5. Double bounded organic molecule used to begin addition polymerization






6. Molecule containing a highly reactive unpaired electron






7. 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






8. Is not asymetric and cannot have multiple configurations






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






10. 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






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






12. 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






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






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






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






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






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






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






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






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






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






23. 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






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






25. 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






26. Process used to make thermoset fibers by performing the polymerization reacting in a solbent as the material flows through a spinneret and into a quenching bath






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






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






29. Primary raw material for most polymers






30. 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






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






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






33. Softening agents






34. Relative configuration of adjecent asymmetric carbons






35. 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






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






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






38. Polymer that is made up a single repeat unit






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






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






41. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






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






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






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