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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. Porcess of breaking large organic hydrocarbons into smaller molecules






2. 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






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






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






5. 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






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






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






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






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






10. Softening agents






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






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






13. Long chain polymers that contain at least 85% of an ester of a substituted aromatic carboxylic acid. these fibers are strong and can dyed or made transpared






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






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






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






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






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






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






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






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






22. 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






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. 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






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






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






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






28. Is not asymetric and cannot have multiple configurations






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






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






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






32. 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






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






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






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






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






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






38. 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






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






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






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






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






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






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






45. 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






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






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






48. 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






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