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






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






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






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






5. 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






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






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






8. An acid and an alcohol






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






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. 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






13. 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






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






15. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants






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






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






18. 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






19. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer






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






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






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






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






24. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants






25. 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






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






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






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






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






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






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






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






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






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






35. Porcess of breaking large organic hydrocarbons into smaller molecules






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






37. Polymer that is made up a single repeat unit






38. Softening agents






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






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






41. Double bounded organic molecule used to begin addition polymerization






42. Coloring agents that do not dissolve into the polymer






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






44. 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






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






46. 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






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






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






49. 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






50. Atoms attached to the polymer backbone.