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






2. Polymer that is made up a single repeat unit






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






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






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






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






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. 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






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






10. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties






11. Softening agents






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






13. 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






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






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






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






17. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






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






24. Atoms attached to the polymer backbone.






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






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






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






28. 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






29. 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






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






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






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






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






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






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






36. 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






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






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






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






40. 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






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






42. 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






43. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






47. 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






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






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






50. 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