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. Polymers that contain amide (- N-) groups in the chain
polypphenylene terephyhalamide PPTA
quenching
hopper
polyamides
2. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
staggered conformation
addition polymerization/chain growth/free- radical polymerization
graft copolymers
spinneret
3. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
copolymer
random copolymers
alternating copolymers
viscose process
4. 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
initiation
primary termination
polymers
step- growth/condensation polymerization
5. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
constitution
spinneret
rayon
additives
6. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
functional groups
fillers
injection molding
screen pack
7. Relative configuration of adjecent asymmetric carbons
syndiotactic dyad
tacticity
oligomers
copolymer
8. An acid and an alcohol
polymers
most common condensation/step- growth polymerization occur between....
tacticity
oligomers
9. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
elastomers
oligomers
alternating copolymers
10. 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
nylon
constitution
isotactic dan
11. 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
screen pack
any carbon with double bonds or repeated substituents
melt spinning
thermoplastics
12. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
copolymer
tow
quenching
extruder
13. 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
initiation
condensation/step- growth polymerization
die
structural unit
14. Smallest repeating unit in a polymer. aka repeat unit
structural unit
dyes
solution spinning
freeze line
15. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
dyes
mutual termination
thermosets
rayon
16. 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
primary bonding
end groups
condensation/step- growth polymerization
polyviyl chloride PVC
17. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
syndiotactic dyad
vulcanization
petroleum
rayon
18. Low- molecular- weight building blocks repeated in the polymer chain
initiation
monomers
constitution
structural unit
19. Coloring agents that do not dissolve into the polymer
pigments
plasticizers
atactic
polyurethanes
20. Polymer that is made up a single repeat unit
random copolymers
melt spinning
homopolymer
vulcanization
21. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
configuration
polyurethanes
step- growth/condensation polymerization
primary bonding
22. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
side groups/ substituents
polymer backbone
configuration
alternating copolymers
23. One type of polymer that contains at least 85% of polyacrylonitrile PAN
plyacrylonitrile PAN
acrylic
functionality
homopolymer
24. Broad category of polymers that includes polymers containing urethane linkages
homopolymer
quenching
side groups/ substituents
polyurethanes
25. Atoms attached to the polymer backbone.
side groups/ substituents
tacticity
polyamides
aramid
26. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polymer backbone
plasticizers
polypphenylene terephyhalamide PPTA
polyviyl chloride PVC
27. 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
thermoplastics
functional groups
vulcanization
28. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
tow
addition polymerization/chain growth/free- radical polymerization
alternating copolymers
constitution
29. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
quenching
secondary bonding
extruder
stabilizers
30. 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
relative molecular mass RMM
gauche conformation
High volume thermoplastics HVTP
31. First step in the process of polymerization - during which a free radical is formed
initiation
die
poly- p- phenylene benzobisoxazole PBO
step- growth/condensation polymerization
32. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
plasticizers
block copolymers
poly- p- phenylene benzobisoxazole PBO
plyacrylonitrile PAN
33. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
conformation
condensation/step- growth polymerization
cracking
constitution
34. Arrangement of the largest substituents where the substituets are offset by 120
staggered conformation
vinyl monomer
polymer backbone
propagation
35. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
melt spinning
addition polymerization/chain growth/free- radical polymerization
random copolymers
copolymer
36. Softening agents
barrel
plasticizers
vulcanization
free radical
37. 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
polymers
isotactic dan
polyamides
38. 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
nylon
functionality
propagation
relative molecular mass RMM
39. Number of bonds a molecule has formed
configuration
plyacrylonitrile PAN
petroleum
functionality
40. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
conformation
poly- p- phenylene benzobisoxazole PBO
injection molding
freeze line
41. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
polyviyl chloride PVC
additives
extruder
viscose process
42. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
tacticity
isotactic dan
propagation
polymethylmethacrylate PMMA
43. Conformation in which the largest substituents are offset by 180
polyesters
conformation
High volume thermoplastics HVTP
trans - conformation
44. Two or more polymers mechanically mixed together but without covalent bonding between them
tacticity
blends
plasticizers
gauche conformation
45. Polymer made up of two of more differenet monomers covalently bonded together
poly- p- phenylene benzobisoxazole PBO
polymethylmethacrylate PMMA
asymetric
copolymer
46. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
die
thermosets
melt spinning
stabilizers
47. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
secondary bonding
side groups/ substituents
fillers
petroleum
48. Carbon atom capable of multiple configurations due to four different substituents
elastomers
dyes
asymetric
fillers
49. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
free radical
eclipsed conformation/ cis - conformation
secondary bonding
spinneret
50. 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
step- growth/condensation polymerization
initiation
plasticizers
mutual termination