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






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






3. Softening agents






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






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






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






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






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






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






10. 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






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






12. Molecule containing a highly reactive unpaired electron






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






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






15. Relative configuration of adjecent asymmetric carbons






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






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






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






19. 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






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






21. 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






22. 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






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






24. Number of bonds a molecule has formed






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






26. 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






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






28. 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






29. Covalent bonding of the polymer backbone and side groups






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






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






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






33. Primary raw material for most polymers






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






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






36. 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






37. 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






38. Polymers comprised of two or more different monomers that attach to the chain in long runs of one type of monomer - followed by another monomer AAAAAAAAAAAAABBBBBBBBBBBBBBBBBBAAAAAAAA






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






40. 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






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






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






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






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






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






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






47. Coloring agents that do not dissolve into the polymer






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






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






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