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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. Molecule containing a highly reactive unpaired electron






2. 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






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






4. Process used to make thermoset fibers by performing the polymerization reacting in a solbent as the material flows through a spinneret and into a quenching bath






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






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






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






8. Softening agents






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






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






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






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






13. Number of bonds a molecule has formed






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






15. 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






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






20. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer






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






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






23. 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






24. An acid and an alcohol






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






26. 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






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






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






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






30. 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






31. Is not asymetric and cannot have multiple configurations






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






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






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






35. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability






36. Atoms attached to the polymer backbone.






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






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






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






40. Relative configuration of adjecent asymmetric carbons






41. 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






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






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






44. 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






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






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






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






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






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