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






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






3. Covalent bonding of the polymer backbone and side groups






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






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






6. 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






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






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






9. Polymer that is made up a single repeat unit






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






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






12. An acid and an alcohol






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






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






16. Atoms attached to the polymer backbone.






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






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






19. 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






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






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






22. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly






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






24. 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






25. Primary raw material for most polymers






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






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






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






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






30. Coloring agents that do not dissolve into the polymer






31. Relative configuration of adjecent asymmetric carbons






32. Simple polymeric material produced as pellets in large quantities






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






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






35. Softening agents






36. 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






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






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






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






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






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






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






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






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






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






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






47. Molecule containing a highly reactive unpaired electron






48. 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






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






50. 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