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. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light






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






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






4. Molecule containing a highly reactive unpaired electron






5. 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






6. 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






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






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






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






10. Covalent bonding of the polymer backbone and side groups






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






12. Double bounded organic molecule used to begin addition polymerization






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






14. 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






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






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






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






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






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






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






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






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






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






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






25. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain






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






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






28. 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






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






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






31. Relative configuration of adjecent asymmetric carbons






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






33. 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






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






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






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






37. Polymer that is made up a single repeat unit






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






39. Porcess of breaking large organic hydrocarbons into smaller molecules






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






41. Is not asymetric and cannot have multiple configurations






42. Primary raw material for most polymers






43. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property






44. 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






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






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






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






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






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






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