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






2. 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






3. Number of bonds a molecule has formed






4. 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






5. 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






6. Simple polymeric material produced as pellets in large quantities






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






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






9. 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






10. Polymer that is made up a single repeat unit






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






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






13. 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






14. Primary raw material for most polymers






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






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






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






18. 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






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






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






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






22. Covalent bonding of the polymer backbone and side groups






23. 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






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






25. Double bounded organic molecule used to begin addition polymerization






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






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






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






29. 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






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






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






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






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






34. 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






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






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






37. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






41. 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






42. An acid and an alcohol






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






44. 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






45. Softening agents






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






47. 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






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






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






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