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






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






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






4. 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






5. Atoms attached to the polymer backbone.






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






7. 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






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






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






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






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






12. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






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






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






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






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






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






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






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






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






27. 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






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






29. 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






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






31. Softening agents






32. Molecule containing a highly reactive unpaired electron






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






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






35. Simple polymeric material produced as pellets in large quantities






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






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






38. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination






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






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






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






42. 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






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






44. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






50. 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