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






3. 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






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






5. 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






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






7. Atoms attached to the polymer backbone.






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






9. Covalent bonding of the polymer backbone and side groups






10. Coloring agents that do not dissolve into the polymer






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






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






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






14. An acid and an alcohol






15. 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






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






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






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






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






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






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






22. 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






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






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






25. 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






26. 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






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






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






29. 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






30. 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






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






32. 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






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






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






35. Porcess of breaking large organic hydrocarbons into smaller molecules






36. Softening agents






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






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






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






40. Relative configuration of adjecent asymmetric carbons






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






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






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






44. 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






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






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






47. 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






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






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






50. Double bounded organic molecule used to begin addition polymerization