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






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






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






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






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






6. 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






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






8. 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






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






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






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






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






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






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






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






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






17. Double bounded organic molecule used to begin addition polymerization






18. 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






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






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






21. 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






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






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






24. Molecule containing a highly reactive unpaired electron






25. 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






26. Relative configuration of adjecent asymmetric carbons






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






28. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light






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






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






31. Long chain polymers that contain at least 85% of an ester of a substituted aromatic carboxylic acid. these fibers are strong and can dyed or made transpared






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






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






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






36. Is not asymetric and cannot have multiple configurations






37. 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






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






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






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






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






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






43. 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






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






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






46. Simple polymeric material produced as pellets in large quantities






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






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






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






50. Porcess of breaking large organic hydrocarbons into smaller molecules