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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. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polyviyl chloride PVC
end groups
polyamides
polyurethanes
2. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
copolymer
termination
functional groups
branching
3. 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
end groups
polyviyl chloride PVC
die
polymer backbone
4. 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
stabilizers
pigments
plasticizers
isotactic dan
5. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
pigments
oligomers
polymers
quenching
6. Polymer made up of two of more differenet monomers covalently bonded together
copolymer
alternating copolymers
functionality
additives
7. 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
melt spinning
fillers
thermosets
elastomers
8. Low- molecular- weight building blocks repeated in the polymer chain
monomers
thermosets
initiation
weight average molecular weight Mw
9. Covalently bonded chains of molecules with small monomer units repeated from end to end
constitution
any carbon with double bonds or repeated substituents
vinyl monomer
polymers
10. Smallest repeating unit in a polymer. aka repeat unit
structural unit
quenching
barrel
tacticity
11. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
addition polymerization/chain growth/free- radical polymerization
polypphenylene terephyhalamide PPTA
conformation
rayon
12. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
polymer backbone
injection molding
number average molecular weight Mn
barrel
13. Softening agents
functional groups
plasticizers
step- growth/condensation polymerization
copolymer
14. 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
hopper
stabilizers
gauche conformation
relative molecular mass RMM
15. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
termination
polyamides
tow
step- growth/condensation polymerization
16. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
vulcanization
coloring agents
thermoplastics
tacticity
17. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
random copolymers
die
blends
copolymer
18. Broad category of polymers that includes polymers containing urethane linkages
homopolymer
termination
blends
polyurethanes
19. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
polyamides
polyurethanes
graft copolymers
primary bonding
20. 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
polymer backbone
condensation/step- growth polymerization
thermoplastics
eclipsed conformation/ cis - conformation
21. Is not asymetric and cannot have multiple configurations
conformation
hopper
any carbon with double bonds or repeated substituents
monomers
22. 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
solution spinning
polymethylmethacrylate PMMA
polymers
homopolymer
23. Polymers that contain amide (- N-) groups in the chain
solution spinning
staggered conformation
blends
polyamides
24. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
addition polymerization/chain growth/free- radical polymerization
degree of polymerization DPn
additives
secondary bonding
25. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
pigments
constitution
plyacrylonitrile PAN
injection molding
26. Conformation in which the largest substituents are offset by 180
syndiotactic dyad
trans - conformation
quenching
fillers
27. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
branching
High volume thermoplastics HVTP
spinneret
elastomers
28. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
end groups
shot size
plasticizers
aramid
29. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
eclipsed conformation/ cis - conformation
mutual termination
petroleum
barrel
30. Number of repeat/structural units in a polymer chain
acrylic
asymetric
syndiotactic dyad
degree of polymerization DPn
31. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
extruder
nylon
plasticizers
oligomers
32. Relative configuration of adjecent asymmetric carbons
alternating copolymers
oligomers
tacticity
solution spinning
33. First step in the process of polymerization - during which a free radical is formed
most common condensation/step- growth polymerization occur between....
initiation
elastomers
conformation
34. Molecule containing a highly reactive unpaired electron
thermoplastics
free radical
staggered conformation
polyamides
35. Covalent bonding of the polymer backbone and side groups
oligomers
syndiotactic dyad
primary bonding
constitution
36. An acid and an alcohol
asymetric
hopper
most common condensation/step- growth polymerization occur between....
alternating copolymers
37. Primary raw material for most polymers
atactic
asymetric
glass transition temperature Tg
petroleum
38. Two or more polymers mechanically mixed together but without covalent bonding between them
aramid
nylon
constitution
blends
39. 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
tacticity
barrel
additives
rayon
40. Polymer that is made up a single repeat unit
homopolymer
end groups
rayon
polyamides
41. One type of polymer that contains at least 85% of polyacrylonitrile PAN
acrylic
screen pack
nylon
relative molecular mass RMM
42. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
screen pack
additives
functionality
barrel
43. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
mutual termination
weight average molecular weight Mw
constitution
coloring agents
44. 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
number average molecular weight Mn
most common condensation/step- growth polymerization occur between....
condensation/step- growth polymerization
atactic
45. Number of bonds a molecule has formed
functionality
polyurethanes
extruder
most common condensation/step- growth polymerization occur between....
46. 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
free radical
quenching
glass transition temperature Tg
branching
47. Coloring agents that do not dissolve into the polymer
any carbon with double bonds or repeated substituents
pigments
syndiotactic dyad
degree of polymerization DPn
48. 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
condensation/step- growth polymerization
blends
stabilizers
49. Carbon atom capable of multiple configurations due to four different substituents
poly- p- phenylene benzobisoxazole PBO
aramid
end groups
asymetric
50. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
structural unit
oligomers
conformation
injection molding