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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. 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






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






3. Softening agents






4. Number of bonds a molecule has formed






5. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






10. 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






11. Atoms attached to the polymer backbone.






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






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






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






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






16. Primary raw material for most polymers






17. 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






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






19. 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






20. Polymer that is made up a single repeat unit






21. Covalent bonding of the polymer backbone and side groups






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






23. 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






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






25. 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






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






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






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






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






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






31. 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






32. 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






33. Relative configuration of adjecent asymmetric carbons






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






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






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






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






38. 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






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






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






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






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






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






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






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






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






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






48. Molecule containing a highly reactive unpaired electron






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






50. Coloring agents that do not dissolve into the polymer