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






2. Porcess of breaking large organic hydrocarbons into smaller molecules






3. 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






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






5. 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






6. Molecule containing a highly reactive unpaired electron






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






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






9. 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






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






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






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






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






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






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






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






17. Covalent bonding of the polymer backbone and side groups






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






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






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






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






22. An acid and an alcohol






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






24. Simple polymeric material produced as pellets in large quantities






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






26. 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






27. 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






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






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






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






31. Is not asymetric and cannot have multiple configurations






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






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






34. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process






35. 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






36. 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






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






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






39. 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






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






41. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets






42. Relative configuration of adjecent asymmetric carbons






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






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






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






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






47. Double bounded organic molecule used to begin addition polymerization






48. One type of polymer that contains at least 85% of polyacrylonitrile PAN






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






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