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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. Simple polymeric material produced as pellets in large quantities






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






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






4. Double bounded organic molecule used to begin addition polymerization






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






6. Primary raw material for most polymers






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






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






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






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






11. An acid and an alcohol






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






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






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






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






16. Softening agents






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






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






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






20. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern






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






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






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






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






25. Porcess of breaking large organic hydrocarbons into smaller molecules






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






27. 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






28. Is not asymetric and cannot have multiple configurations






29. Polymer that is made up a single repeat unit






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






31. 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






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






33. 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






34. Atoms attached to the polymer backbone.






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






36. 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






37. Arrangement of the largest substituents where the substituets are offset by 120






38. 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






39. Coloring agents that do not dissolve into the polymer






40. 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






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






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






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






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






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






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






47. 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






48. Relative configuration of adjecent asymmetric carbons






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






50. Number of bonds a molecule has formed