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






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






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. Second- order thermodynamic transition in which the onset of large scale chain mobility occures in polymers. Bellow Tg the polymer is glasslike and brittle. above Tg the polymer becomes rubbery and flexible






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






7. Polymer that is made up a single repeat unit






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






9. 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






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






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






12. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






18. 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






19. 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






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






21. Coloring agents that do not dissolve into the polymer






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






23. 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






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






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






26. 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






27. 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






28. Relative configuration of adjecent asymmetric carbons






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






30. 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






31. 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






32. An acid and an alcohol






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






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






35. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads






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






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






38. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






43. Softening agents






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






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






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






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






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






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






50. 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