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






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






3. 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






4. 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






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






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






7. 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






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






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






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






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






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






13. Softening agents






14. 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






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






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






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






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






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






20. 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






21. Is not asymetric and cannot have multiple configurations






22. 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






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






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






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






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






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






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






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






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






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






32. Relative configuration of adjecent asymmetric carbons






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






34. Molecule containing a highly reactive unpaired electron






35. Covalent bonding of the polymer backbone and side groups






36. An acid and an alcohol






37. Primary raw material for most polymers






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






39. 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






40. Polymer that is made up a single repeat unit






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






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






44. 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






45. Number of bonds a molecule has formed






46. 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






47. Coloring agents that do not dissolve into the polymer






48. 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






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






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