SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
|
Email
Search
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. Conformation in which the largest substituents are offset by 180
acrylic
trans - conformation
pigments
copolymer
2. 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
propagation
primary termination
step- growth/condensation polymerization
polypphenylene terephyhalamide PPTA
3. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polymers
polypphenylene terephyhalamide PPTA
fillers
monomers
4. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
extruder
quenching
oligomers
pigments
5. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
viscose process
structural unit
asymetric
alternating copolymers
6. 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
side groups/ substituents
block copolymers
propagation
7. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
primary termination
random copolymers
aramid
homopolymer
8. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
conformation
nylon
cracking
structural unit
9. Pigments or dyes that change the way light is absorbed or reflected by a polymer
any carbon with double bonds or repeated substituents
addition polymerization/chain growth/free- radical polymerization
polyurethanes
coloring agents
10. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
secondary bonding
graft copolymers
addition polymerization/chain growth/free- radical polymerization
condensation/step- growth polymerization
11. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
polyesters
branching
quenching
viscose process
12. Two or more polymers mechanically mixed together but without covalent bonding between them
blends
block copolymers
melt spinning
petroleum
13. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
vinyl monomer
secondary bonding
spinneret
functionality
14. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
configuration
poly- p- phenylene benzobisoxazole PBO
aramid
pigments
15. Number of bonds a molecule has formed
functional groups
functionality
injection molding
aramid
16. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
polyamides
polyviyl chloride PVC
shot size
dyes
17. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
aramid
primary termination
thermosets
addition polymerization/chain growth/free- radical polymerization
18. First step in the process of polymerization - during which a free radical is formed
initiation
random copolymers
copolymer
monomers
19. Additives whose primary purpose is to reduce the final cost of the product
primary bonding
vinyl monomer
graft copolymers
fillers
20. 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
homopolymer
additives
isotactic dan
21. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
branching
plyacrylonitrile PAN
coloring agents
configuration
22. Porcess of breaking large organic hydrocarbons into smaller molecules
High volume thermoplastics HVTP
screen pack
step- growth/condensation polymerization
cracking
23. Covalent bonding of the polymer backbone and side groups
melt spinning
rayon
primary bonding
structural unit
24. Conformation that occurs when the largest substituent in a molecule are offset by 60
oligomers
gauche conformation
free radical
configuration
25. One type of polymer that contains at least 85% of polyacrylonitrile PAN
High volume thermoplastics HVTP
plyacrylonitrile PAN
random copolymers
acrylic
26. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
tacticity
aramid
stabilizers
thermoplastics
27. Relative configuration of adjecent asymmetric carbons
tacticity
number average molecular weight Mn
stabilizers
plasticizers
28. Primary raw material for most polymers
screen pack
petroleum
quenching
acrylic
29. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
secondary bonding
asymetric
extruder
constitution
30. 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
homopolymer
glass transition temperature Tg
injection molding
blends
31. Broad category of polymers that includes polymers containing urethane linkages
elastomers
freeze line
polyurethanes
screen pack
32. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
freeze line
melt spinning
elastomers
thermosets
33. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
screen pack
number average molecular weight Mn
elastomers
plyacrylonitrile PAN
34. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
atactic
termination
die
tow
35. Atoms attached to the polymer backbone.
initiation
melt spinning
side groups/ substituents
petroleum
36. Number of repeat/structural units in a polymer chain
eclipsed conformation/ cis - conformation
degree of polymerization DPn
side groups/ substituents
copolymer
37. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
melt spinning
polymethylmethacrylate PMMA
syndiotactic dyad
dyes
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
asymetric
acrylic
elastomers
39. Polymers that contain amide (- N-) groups in the chain
conformation
polyamides
copolymer
polyviyl chloride PVC
40. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
screen pack
random copolymers
polyurethanes
primary bonding
41. 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
gauche conformation
polymer backbone
number average molecular weight Mn
polyesters
42. 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
homopolymer
plasticizers
hopper
melt spinning
43. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
melt spinning
nylon
syndiotactic dyad
fillers
44. Smallest repeating unit in a polymer. aka repeat unit
constitution
structural unit
primary bonding
gauche conformation
45. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
trans - conformation
dyes
polymer backbone
constitution
46. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
tow
functionality
monomers
elastomers
47. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
rayon
polyurethanes
stabilizers
graft copolymers
48. 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
most common condensation/step- growth polymerization occur between....
random copolymers
number average molecular weight Mn
branching
49. An acid and an alcohol
degree of polymerization DPn
most common condensation/step- growth polymerization occur between....
primary bonding
copolymer
50. Low- molecular- weight building blocks repeated in the polymer chain
coloring agents
degree of polymerization DPn
plasticizers
monomers