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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. 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






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






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






4. Softening agents






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






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






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






8. 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






9. 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






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






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






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






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






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






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






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






18. Relative configuration of adjecent asymmetric carbons






19. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds






20. Coloring agents that do not dissolve into the polymer






21. Simple polymeric material produced as pellets in large quantities






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






23. Atoms attached to the polymer backbone.






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






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






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






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






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






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






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






31. Molecule containing a highly reactive unpaired electron






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






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






34. 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






35. 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






36. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






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






43. 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






44. 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






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






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






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






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






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






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






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