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Modern Material Science And Engineering 2

Subject : engineering
Instructions:
  • Answer 50 questions in 30 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 with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed






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






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






4. 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






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






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






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






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






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






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






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






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






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






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






15. Molecule containing a highly reactive unpaired electron






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






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






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






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






20. 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






21. 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






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






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






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






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






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






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






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






29. 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






30. 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






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






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






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






34. 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






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






36. 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






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






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






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






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






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






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






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






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






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






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






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






48. 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






49. Is not asymetric and cannot have multiple configurations






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






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