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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. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
mutual termination
degree of polymerization DPn
plyacrylonitrile PAN
polyviyl chloride PVC
2. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
acrylic
structural unit
syndiotactic dyad
polyviyl chloride PVC
3. Smallest repeating unit in a polymer. aka repeat unit
structural unit
functional groups
plasticizers
isotactic dan
4. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
gauche conformation
shot size
initiation
hopper
5. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
copolymer
viscose process
mutual termination
coloring agents
6. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
plasticizers
nylon
homopolymer
constitution
7. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
atactic
polymers
injection molding
spinneret
8. 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
polyurethanes
polymers
quenching
9. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
vulcanization
gauche conformation
relative molecular mass RMM
graft copolymers
10. Broad category of polymers that includes polymers containing urethane linkages
most common condensation/step- growth polymerization occur between....
polyurethanes
mutual termination
structural unit
11. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
end groups
glass transition temperature Tg
coloring agents
melt spinning
12. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
petroleum
vinyl monomer
propagation
degree of polymerization DPn
13. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
polyurethanes
rayon
isotactic dan
end groups
14. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
any carbon with double bonds or repeated substituents
atactic
structural unit
configuration
15. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
structural unit
primary termination
syndiotactic dyad
barrel
16. Molecule containing a highly reactive unpaired electron
number average molecular weight Mn
structural unit
relative molecular mass RMM
free radical
17. 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
syndiotactic dyad
coloring agents
melt spinning
solution spinning
18. 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
fillers
glass transition temperature Tg
polyamides
primary bonding
19. Covalent bonding of the polymer backbone and side groups
primary bonding
barrel
screen pack
graft copolymers
20. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
degree of polymerization DPn
termination
atactic
step- growth/condensation polymerization
21. 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
atactic
tow
homopolymer
22. Polymer that is made up a single repeat unit
coloring agents
screen pack
glass transition temperature Tg
homopolymer
23. Covalently bonded chains of molecules with small monomer units repeated from end to end
polymethylmethacrylate PMMA
pigments
polymers
initiation
24. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
polyviyl chloride PVC
configuration
functionality
extruder
25. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
copolymer
dyes
functional groups
tacticity
26. One type of polymer that contains at least 85% of polyacrylonitrile PAN
extruder
acrylic
polyesters
conformation
27. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
polymers
injection molding
additives
addition polymerization/chain growth/free- radical polymerization
28. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
eclipsed conformation/ cis - conformation
functional groups
oligomers
constitution
29. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
side groups/ substituents
secondary bonding
viscose process
shot size
30. Atoms attached to the polymer backbone.
High volume thermoplastics HVTP
side groups/ substituents
homopolymer
initiation
31. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
High volume thermoplastics HVTP
condensation/step- growth polymerization
propagation
quenching
32. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
plasticizers
relative molecular mass RMM
polymethylmethacrylate PMMA
hopper
33. 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
functionality
functional groups
branching
barrel
34. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
polypphenylene terephyhalamide PPTA
acrylic
poly- p- phenylene benzobisoxazole PBO
vulcanization
35. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
primary bonding
polyamides
isotactic dan
36. 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
polyviyl chloride PVC
trans - conformation
rayon
number average molecular weight Mn
37. 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
glass transition temperature Tg
initiation
trans - conformation
38. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
any carbon with double bonds or repeated substituents
side groups/ substituents
screen pack
39. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
aramid
gauche conformation
High volume thermoplastics HVTP
vulcanization
40. 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
melt spinning
alternating copolymers
isotactic dan
block copolymers
41. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
primary bonding
screen pack
blends
freeze line
42. 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
die
shot size
mutual termination
atactic
43. First step in the process of polymerization - during which a free radical is formed
relative molecular mass RMM
staggered conformation
initiation
aramid
44. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
conformation
syndiotactic dyad
most common condensation/step- growth polymerization occur between....
functional groups
45. Arrangement of the largest substituents where the substituets are offset by 120
mutual termination
random copolymers
staggered conformation
polymer backbone
46. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
copolymer
step- growth/condensation polymerization
polypphenylene terephyhalamide PPTA
oligomers
47. Porcess of breaking large organic hydrocarbons into smaller molecules
cracking
functional groups
polyviyl chloride PVC
High volume thermoplastics HVTP
48. Number of repeat/structural units in a polymer chain
relative molecular mass RMM
screen pack
asymetric
degree of polymerization DPn
49. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
step- growth/condensation polymerization
elastomers
random copolymers
structural unit
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
addition polymerization/chain growth/free- radical polymerization
weight average molecular weight Mw
condensation/step- growth polymerization
side groups/ substituents