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






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






3. 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






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






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






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






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






8. 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






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






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






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






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






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






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






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






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






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






18. 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






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






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






21. 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






22. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






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






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






30. Number of bonds a molecule has formed






31. One type of polymer that contains at least 85% of polyacrylonitrile PAN






32. 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






33. 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






34. 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






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






36. 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






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






38. Simple polymeric material produced as pellets in large quantities






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






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






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






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






43. Covalently bonded chains of molecules with small monomer units repeated from end to end






44. Relative configuration of adjecent asymmetric carbons






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






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






47. 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






48. 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






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






50. An acid and an alcohol