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






2. 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






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






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






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






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






7. 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






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






9. Number of bonds a molecule has formed






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






11. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion






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






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






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






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






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






17. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






23. 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






24. Primary raw material for most polymers






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






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






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






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






29. 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






30. 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






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






32. 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






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






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






35. An acid and an alcohol






36. Polymer that is made up a single repeat unit






37. Simple polymeric material produced as pellets in large quantities






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






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






40. Coloring agents that do not dissolve into the polymer






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






42. Molecule containing a highly reactive unpaired electron






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






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






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






46. Relative configuration of adjecent asymmetric carbons






47. 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






48. 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






49. 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






50. 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