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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. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
eclipsed conformation/ cis - conformation
melt spinning
polymers
branching
2. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
copolymer
polypphenylene terephyhalamide PPTA
polyviyl chloride PVC
end groups
3. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
number average molecular weight Mn
side groups/ substituents
polymer backbone
addition polymerization/chain growth/free- radical polymerization
4. Conformation in which the largest substituents are offset by 180
petroleum
copolymer
blends
trans - conformation
5. Porcess of breaking large organic hydrocarbons into smaller molecules
dyes
conformation
cracking
stabilizers
6. 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
asymetric
poly- p- phenylene benzobisoxazole PBO
glass transition temperature Tg
polymer backbone
7. Low- molecular- weight building blocks repeated in the polymer chain
coloring agents
random copolymers
degree of polymerization DPn
monomers
8. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
polymethylmethacrylate PMMA
most common condensation/step- growth polymerization occur between....
die
functional groups
9. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
branching
addition polymerization/chain growth/free- radical polymerization
relative molecular mass RMM
pigments
10. 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
polymers
degree of polymerization DPn
freeze line
11. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
most common condensation/step- growth polymerization occur between....
polymer backbone
quenching
any carbon with double bonds or repeated substituents
12. Double bounded organic molecule used to begin addition polymerization
monomers
vinyl monomer
mutual termination
High volume thermoplastics HVTP
13. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
freeze line
trans - conformation
initiation
graft copolymers
14. Arrangement of the largest substituents where the substituets are offset by 120
degree of polymerization DPn
extruder
staggered conformation
polypphenylene terephyhalamide PPTA
15. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
spinneret
rayon
functional groups
stabilizers
16. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
trans - conformation
hopper
thermoplastics
dyes
17. Conformation that occurs when the largest substituent in a molecule are offset by 60
oligomers
homopolymer
gauche conformation
thermosets
18. Polymer made up of two of more differenet monomers covalently bonded together
relative molecular mass RMM
copolymer
polyviyl chloride PVC
staggered conformation
19. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
trans - conformation
cracking
thermosets
fillers
20. 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
relative molecular mass RMM
polyesters
random copolymers
alternating copolymers
21. 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
any carbon with double bonds or repeated substituents
secondary bonding
blends
isotactic dan
22. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
conformation
coloring agents
polyurethanes
plyacrylonitrile PAN
23. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
polymethylmethacrylate PMMA
polyurethanes
staggered conformation
relative molecular mass RMM
24. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
solution spinning
conformation
stabilizers
blends
25. 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
plasticizers
branching
spinneret
side groups/ substituents
26. Molecule containing a highly reactive unpaired electron
staggered conformation
homopolymer
free radical
blends
27. Smallest repeating unit in a polymer. aka repeat unit
constitution
structural unit
die
random copolymers
28. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
copolymer
plyacrylonitrile PAN
oligomers
injection molding
29. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
atactic
poly- p- phenylene benzobisoxazole PBO
trans - conformation
polymers
30. 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
fillers
termination
solution spinning
mutual termination
31. First step in the process of polymerization - during which a free radical is formed
coloring agents
additives
initiation
freeze line
32. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
extruder
additives
dyes
injection molding
33. Atoms attached to the polymer backbone.
atactic
High volume thermoplastics HVTP
side groups/ substituents
monomers
34. 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
aramid
secondary bonding
injection molding
35. Primary raw material for most polymers
High volume thermoplastics HVTP
most common condensation/step- growth polymerization occur between....
petroleum
additives
36. Covalently bonded chains of molecules with small monomer units repeated from end to end
polymers
propagation
polyamides
thermosets
37. 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
any carbon with double bonds or repeated substituents
copolymer
number average molecular weight Mn
screen pack
38. 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
isotactic dan
degree of polymerization DPn
asymetric
39. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
freeze line
vulcanization
polyamides
spinneret
40. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
graft copolymers
addition polymerization/chain growth/free- radical polymerization
termination
oligomers
41. 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
graft copolymers
step- growth/condensation polymerization
condensation/step- growth polymerization
fillers
42. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
atactic
blends
functional groups
primary termination
43. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
polyamides
atactic
polyesters
44. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
secondary bonding
alternating copolymers
homopolymer
polyviyl chloride PVC
45. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
monomers
weight average molecular weight Mw
barrel
random copolymers
46. 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
graft copolymers
configuration
solution spinning
47. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
acrylic
configuration
relative molecular mass RMM
addition polymerization/chain growth/free- radical polymerization
48. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
conformation
propagation
alternating copolymers
aramid
49. Broad category of polymers that includes polymers containing urethane linkages
quenching
polyurethanes
relative molecular mass RMM
hopper
50. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
elastomers
tow
constitution
melt spinning