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






2. 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






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






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






5. Simple polymeric material produced as pellets in large quantities






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






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






8. Covalent bonding of the polymer backbone and side groups






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






10. Number of bonds a molecule has formed






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






12. 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






13. 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






14. 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






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






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






17. 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






18. 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






19. 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






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






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






22. Atoms attached to the polymer backbone.






23. Porcess of breaking large organic hydrocarbons into smaller molecules






24. Coloring agents that do not dissolve into the polymer






25. Primary raw material for most polymers






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






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






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






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






30. 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






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






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






33. 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






34. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






40. 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






41. Softening agents






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






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






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






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






46. 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






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






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






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






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