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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. 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






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






3. Molecule containing a highly reactive unpaired electron






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






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






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






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






8. 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






9. 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






10. 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






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






12. Atoms attached to the polymer backbone.






13. Softening agents






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






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






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






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






18. Relative configuration of adjecent asymmetric carbons






19. Is not asymetric and cannot have multiple configurations






20. 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






21. 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






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






23. An acid and an alcohol






24. Polymer that is made up a single repeat unit






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






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






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






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






29. Number of bonds a molecule has formed






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






31. Covalent bonding of the polymer backbone and side groups






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






33. Double bounded organic molecule used to begin addition polymerization






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






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






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






37. 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






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






39. 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






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






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






42. 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






43. 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






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






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






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






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






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






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






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