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Test your basic knowledge |
Modern Material Science And Engineering 2
Start Test
Study First
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 extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
termination
die
hopper
aramid
2. Polymer that is made up a single repeat unit
coloring agents
homopolymer
weight average molecular weight Mw
condensation/step- growth polymerization
3. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
polyamides
polyesters
quenching
barrel
4. Smallest repeating unit in a polymer. aka repeat unit
tacticity
structural unit
dyes
trans - conformation
5. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
secondary bonding
polyesters
poly- p- phenylene benzobisoxazole PBO
staggered conformation
6. An acid and an alcohol
thermoplastics
eclipsed conformation/ cis - conformation
most common condensation/step- growth polymerization occur between....
screen pack
7. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
polyviyl chloride PVC
alternating copolymers
spinneret
freeze line
8. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
polymer backbone
addition polymerization/chain growth/free- radical polymerization
poly- p- phenylene benzobisoxazole PBO
stabilizers
9. Relative configuration of adjecent asymmetric carbons
any carbon with double bonds or repeated substituents
glass transition temperature Tg
tacticity
structural unit
10. One type of polymer that contains at least 85% of polyacrylonitrile PAN
fillers
condensation/step- growth polymerization
acrylic
screen pack
11. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
conformation
polymethylmethacrylate PMMA
initiation
polymers
12. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
configuration
melt spinning
viscose process
atactic
13. 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
relative molecular mass RMM
injection molding
rayon
poly- p- phenylene benzobisoxazole PBO
14. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
functionality
viscose process
asymetric
aramid
15. Covalent bonding of the polymer backbone and side groups
primary bonding
quenching
alternating copolymers
atactic
16. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
nylon
tow
extruder
free radical
17. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
copolymer
plasticizers
rayon
barrel
18. 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
conformation
screen pack
atactic
melt spinning
19. 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
step- growth/condensation polymerization
any carbon with double bonds or repeated substituents
side groups/ substituents
blends
20. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
configuration
condensation/step- growth polymerization
primary termination
tow
21. 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
tacticity
mutual termination
polypphenylene terephyhalamide PPTA
polymethylmethacrylate PMMA
22. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
condensation/step- growth polymerization
tow
polypphenylene terephyhalamide PPTA
plyacrylonitrile PAN
23. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
staggered conformation
end groups
primary bonding
free radical
24. Additives whose primary purpose is to reduce the final cost of the product
secondary bonding
plasticizers
eclipsed conformation/ cis - conformation
fillers
25. 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
asymetric
solution spinning
structural unit
graft copolymers
26. 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
shot size
nylon
conformation
glass transition temperature Tg
27. Polymers that contain amide (- N-) groups in the chain
polyamides
pigments
die
trans - conformation
28. Part of the extrusion apparatus that contains a heated screw which is used to melt the polymer and the polymer forward into the next chamber
thermoplastics
conformation
barrel
gauche conformation
29. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
functional groups
thermoplastics
gauche conformation
acrylic
30. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
step- growth/condensation polymerization
viscose process
die
injection molding
31. Covalently bonded chains of molecules with small monomer units repeated from end to end
plasticizers
High volume thermoplastics HVTP
polymers
structural unit
32. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
polymers
thermoplastics
nylon
thermosets
33. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
isotactic dan
block copolymers
glass transition temperature Tg
34. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
initiation
graft copolymers
plasticizers
viscose process
35. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
block copolymers
freeze line
polyurethanes
vulcanization
36. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
primary termination
pigments
shot size
weight average molecular weight Mw
37. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
stabilizers
dyes
petroleum
configuration
38. 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
weight average molecular weight Mw
poly- p- phenylene benzobisoxazole PBO
cracking
any carbon with double bonds or repeated substituents
39. Two or more polymers mechanically mixed together but without covalent bonding between them
barrel
primary bonding
blends
propagation
40. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
solution spinning
step- growth/condensation polymerization
addition polymerization/chain growth/free- radical polymerization
poly- p- phenylene benzobisoxazole PBO
41. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
weight average molecular weight Mw
atactic
pigments
High volume thermoplastics HVTP
42. Softening agents
thermosets
plasticizers
secondary bonding
conformation
43. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
additives
poly- p- phenylene benzobisoxazole PBO
staggered conformation
relative molecular mass RMM
44. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
staggered conformation
free radical
polyviyl chloride PVC
stabilizers
45. Porcess of breaking large organic hydrocarbons into smaller molecules
cracking
poly- p- phenylene benzobisoxazole PBO
shot size
most common condensation/step- growth polymerization occur between....
46. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
polymer backbone
constitution
quenching
asymetric
47. Number of bonds a molecule has formed
functionality
extruder
relative molecular mass RMM
termination
48. Conformation that occurs when the largest substituent in a molecule are offset by 60
asymetric
elastomers
tacticity
gauche conformation
49. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
homopolymer
primary termination
polyamides
configuration
50. 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
nylon
number average molecular weight Mn
side groups/ substituents
asymetric