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






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






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






4. 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






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






6. 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






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






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






9. 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






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






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






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






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






14. 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






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






16. Softening agents






17. 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






18. 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






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






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






21. Porcess of breaking large organic hydrocarbons into smaller molecules






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






23. Simple polymeric material produced as pellets in large quantities






24. 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






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






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






27. 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






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






29. 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






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






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






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






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






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






36. Polymer that is made up a single repeat unit






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






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






39. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






45. An acid and an alcohol






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






47. 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






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






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






50. Atoms attached to the polymer backbone.