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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. Covalent bonding of the polymer backbone and side groups






2. Porcess of breaking large organic hydrocarbons into smaller molecules






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






4. Is not asymetric and cannot have multiple configurations






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






6. 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






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






8. Softening agents






9. An acid and an alcohol






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






11. 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






12. 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






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






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






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






16. 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






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






18. 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






19. 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






20. Double bounded organic molecule used to begin addition polymerization






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






22. 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






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






24. Relative configuration of adjecent asymmetric carbons






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






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






27. 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






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






29. 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






30. Polymer that is made up a single repeat unit






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






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






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






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






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






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






37. Primary raw material for most polymers






38. 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






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






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






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






42. 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






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






44. Simple polymeric material produced as pellets in large quantities






45. 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






46. 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






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






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






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






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