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






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






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






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. Smallest repeating unit in a polymer. aka repeat unit






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






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






8. 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






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






10. 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






11. 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






12. 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






13. Atoms attached to the polymer backbone.






14. Polymer that is made up a single repeat unit






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






16. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






22. Coloring agents that do not dissolve into the polymer






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






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






25. 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






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






27. 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






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






29. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)






30. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings






31. Primary raw material for most polymers






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






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






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






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






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






37. 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






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






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






40. 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






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






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






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






44. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern






45. An acid and an alcohol






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






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






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






49. 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






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