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






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






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






4. 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






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






6. Porcess of breaking large organic hydrocarbons into smaller molecules






7. Number of bonds a molecule has formed






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






9. Atoms attached to the polymer backbone.






10. 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






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






12. Simple polymeric material produced as pellets in large quantities






13. 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






14. 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






15. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






21. 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






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






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






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






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






26. 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






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






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






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






30. 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






31. Is not asymetric and cannot have multiple configurations






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






33. 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






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






35. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






41. 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






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






43. 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






44. Softening agents






45. 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






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






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






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






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






50. 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