Test your basic knowledge |

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






2. Primary raw material for most polymers






3. 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






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






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






6. Double bounded organic molecule used to begin addition polymerization






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






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






9. 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






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






11. 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






12. Relative configuration of adjecent asymmetric carbons






13. Atoms attached to the polymer backbone.






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






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






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






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






18. Number of bonds a molecule has formed






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






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






21. Molecule containing a highly reactive unpaired electron






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






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






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






25. 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






26. 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






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






28. Coloring agents that do not dissolve into the polymer






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






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






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






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






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






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






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






36. Polymer that is made up a single repeat unit






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






38. 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






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






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






41. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret






42. 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






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






44. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air






45. 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






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






47. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds






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






50. 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