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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. 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






2. 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






3. 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






4. An acid and an alcohol






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






6. Number of bonds a molecule has formed






7. 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






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






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






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






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






12. Softening agents






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






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






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






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






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






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






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






20. Relative configuration of adjecent asymmetric carbons






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






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. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






28. 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






29. 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






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






32. 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






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






34. 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






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






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






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






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






41. 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






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






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






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






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






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






47. 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






48. Double bounded organic molecule used to begin addition polymerization






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






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