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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. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
branching
propagation
graft copolymers
atactic
2. 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
branching
vinyl monomer
any carbon with double bonds or repeated substituents
freeze line
3. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
thermoplastics
end groups
polypphenylene terephyhalamide PPTA
vulcanization
4. One type of polymer that contains at least 85% of polyacrylonitrile PAN
acrylic
termination
glass transition temperature Tg
melt spinning
5. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
poly- p- phenylene benzobisoxazole PBO
polypphenylene terephyhalamide PPTA
conformation
solution spinning
6. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
polymer backbone
fillers
poly- p- phenylene benzobisoxazole PBO
oligomers
7. 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
die
petroleum
poly- p- phenylene benzobisoxazole PBO
primary termination
8. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
viscose process
injection molding
polyesters
thermoplastics
9. Number of bonds a molecule has formed
gauche conformation
functionality
High volume thermoplastics HVTP
coloring agents
10. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
condensation/step- growth polymerization
syndiotactic dyad
eclipsed conformation/ cis - conformation
poly- p- phenylene benzobisoxazole PBO
11. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
conformation
blends
aramid
side groups/ substituents
12. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
freeze line
constitution
mutual termination
melt spinning
13. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
polyurethanes
dyes
quenching
degree of polymerization DPn
14. Smallest repeating unit in a polymer. aka repeat unit
homopolymer
additives
structural unit
die
15. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
functional groups
end groups
functionality
polyviyl chloride PVC
16. Additives whose primary purpose is to reduce the final cost of the product
condensation/step- growth polymerization
fillers
poly- p- phenylene benzobisoxazole PBO
monomers
17. Double bounded organic molecule used to begin addition polymerization
viscose process
vinyl monomer
blends
structural unit
18. First step in the process of polymerization - during which a free radical is formed
plasticizers
dyes
polyesters
initiation
19. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
initiation
shot size
end groups
20. Conformation that occurs when the largest substituent in a molecule are offset by 60
condensation/step- growth polymerization
polypphenylene terephyhalamide PPTA
structural unit
gauche conformation
21. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
staggered conformation
thermosets
relative molecular mass RMM
cracking
22. Pigments or dyes that change the way light is absorbed or reflected by a polymer
extruder
isotactic dan
dyes
coloring agents
23. 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
rayon
pigments
die
glass transition temperature Tg
24. Primary raw material for most polymers
condensation/step- growth polymerization
polyamides
petroleum
any carbon with double bonds or repeated substituents
25. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
condensation/step- growth polymerization
viscose process
structural unit
spinneret
26. Broad category of polymers that includes polymers containing urethane linkages
staggered conformation
polyurethanes
thermoplastics
stabilizers
27. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
constitution
screen pack
solution spinning
stabilizers
28. Low- molecular- weight building blocks repeated in the polymer chain
free radical
monomers
extruder
petroleum
29. Polymers comprised of two or more different monomers that attach to the chain in long runs of one type of monomer - followed by another monomer AAAAAAAAAAAAABBBBBBBBBBBBBBBBBBAAAAAAAA
block copolymers
free radical
isotactic dan
atactic
30. 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
extruder
melt spinning
primary termination
petroleum
31. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
polyviyl chloride PVC
conformation
syndiotactic dyad
initiation
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
polyamides
branching
isotactic dan
atactic
33. Covalently bonded chains of molecules with small monomer units repeated from end to end
polymers
termination
elastomers
glass transition temperature Tg
34. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
primary termination
plyacrylonitrile PAN
aramid
random copolymers
35. An acid and an alcohol
most common condensation/step- growth polymerization occur between....
end groups
extruder
polymethylmethacrylate PMMA
36. Polymer that is made up a single repeat unit
asymetric
homopolymer
graft copolymers
tacticity
37. Simple polymeric material produced as pellets in large quantities
aramid
High volume thermoplastics HVTP
functional groups
polyamides
38. Polymers that contain amide (- N-) groups in the chain
pigments
branching
polyamides
copolymer
39. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
atactic
tow
eclipsed conformation/ cis - conformation
constitution
40. Coloring agents that do not dissolve into the polymer
pigments
thermosets
plyacrylonitrile PAN
primary termination
41. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
thermoplastics
additives
degree of polymerization DPn
petroleum
42. Molecule containing a highly reactive unpaired electron
cracking
polyurethanes
atactic
free radical
43. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
graft copolymers
rayon
free radical
gauche conformation
44. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
polyesters
injection molding
cracking
polymethylmethacrylate PMMA
45. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
freeze line
glass transition temperature Tg
shot size
step- growth/condensation polymerization
46. Relative configuration of adjecent asymmetric carbons
polymers
tacticity
primary termination
copolymer
47. 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
barrel
rayon
relative molecular mass RMM
asymetric
48. 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
coloring agents
glass transition temperature Tg
end groups
plasticizers
49. Long chain polymers that contain at least 85% of an ester of a substituted aromatic carboxylic acid. these fibers are strong and can dyed or made transpared
polyesters
oligomers
number average molecular weight Mn
die
50. 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
most common condensation/step- growth polymerization occur between....
fillers
condensation/step- growth polymerization
quenching