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






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






3. Porcess of breaking large organic hydrocarbons into smaller molecules






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






5. 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






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






7. Coloring agents that do not dissolve into the polymer






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






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






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






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






12. 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






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






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






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






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






17. An acid and an alcohol






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






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






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






21. Relative configuration of adjecent asymmetric carbons






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






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






24. 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






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






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






27. Softening agents






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






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






30. 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






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






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






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






34. Covalent bonding of the polymer backbone and side groups






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






36. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds






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






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






39. 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






40. 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






41. 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






42. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret






43. 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






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






45. 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






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






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






48. Molecule containing a highly reactive unpaired electron






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






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