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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. Polymer made up of two of more differenet monomers covalently bonded together
copolymer
dyes
plasticizers
random copolymers
2. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
end groups
syndiotactic dyad
initiation
barrel
3. 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
barrel
random copolymers
4. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
random copolymers
quenching
blends
polymer backbone
5. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
hopper
eclipsed conformation/ cis - conformation
elastomers
tow
6. 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
poly- p- phenylene benzobisoxazole PBO
pigments
solution spinning
7. Relative configuration of adjecent asymmetric carbons
cracking
trans - conformation
polymer backbone
tacticity
8. 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
plyacrylonitrile PAN
glass transition temperature Tg
polymethylmethacrylate PMMA
relative molecular mass RMM
9. Pigments or dyes that change the way light is absorbed or reflected by a polymer
graft copolymers
coloring agents
rayon
tow
10. First step in the process of polymerization - during which a free radical is formed
glass transition temperature Tg
initiation
asymetric
nylon
11. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
side groups/ substituents
most common condensation/step- growth polymerization occur between....
homopolymer
12. Covalently bonded chains of molecules with small monomer units repeated from end to end
copolymer
polymers
vulcanization
functionality
13. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
plyacrylonitrile PAN
polyviyl chloride PVC
branching
nylon
14. Porcess of breaking large organic hydrocarbons into smaller molecules
cracking
alternating copolymers
secondary bonding
configuration
15. 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
plyacrylonitrile PAN
polyamides
weight average molecular weight Mw
degree of polymerization DPn
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
step- growth/condensation polymerization
melt spinning
thermoplastics
fillers
17. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
mutual termination
dyes
functional groups
plyacrylonitrile PAN
18. One type of polymer that contains at least 85% of polyacrylonitrile PAN
acrylic
vinyl monomer
pigments
constitution
19. Broad category of polymers that includes polymers containing urethane linkages
polyurethanes
relative molecular mass RMM
shot size
number average molecular weight Mn
20. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
elastomers
tow
extruder
conformation
21. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
block copolymers
polyamides
extruder
elastomers
22. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
block copolymers
primary termination
injection molding
polymer backbone
23. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
tow
polymer backbone
addition polymerization/chain growth/free- radical polymerization
syndiotactic dyad
24. Covalent bonding of the polymer backbone and side groups
termination
asymetric
primary bonding
configuration
25. Polymers that contain amide (- N-) groups in the chain
alternating copolymers
polyamides
poly- p- phenylene benzobisoxazole PBO
dyes
26. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
nylon
primary termination
freeze line
tacticity
27. 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
conformation
extruder
degree of polymerization DPn
28. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
secondary bonding
melt spinning
propagation
rayon
29. Polymer that is made up a single repeat unit
homopolymer
polyviyl chloride PVC
polypphenylene terephyhalamide PPTA
random copolymers
30. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
polypphenylene terephyhalamide PPTA
coloring agents
propagation
viscose process
31. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
rayon
branching
most common condensation/step- growth polymerization occur between....
32. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
polypphenylene terephyhalamide PPTA
dyes
solution spinning
most common condensation/step- growth polymerization occur between....
33. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
aramid
freeze line
functionality
poly- p- phenylene benzobisoxazole PBO
34. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
addition polymerization/chain growth/free- radical polymerization
die
secondary bonding
asymetric
35. Primary raw material for most polymers
petroleum
plyacrylonitrile PAN
tow
graft copolymers
36. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
termination
atactic
staggered conformation
syndiotactic dyad
37. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
tacticity
polyamides
polyviyl chloride PVC
acrylic
38. 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
structural unit
polyesters
melt spinning
free radical
39. Softening agents
vinyl monomer
functional groups
branching
plasticizers
40. 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
vinyl monomer
structural unit
mutual termination
extruder
41. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
isotactic dan
condensation/step- growth polymerization
polyviyl chloride PVC
additives
42. 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
glass transition temperature Tg
addition polymerization/chain growth/free- radical polymerization
elastomers
barrel
43. 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
plasticizers
asymetric
fillers
elastomers
44. Low- molecular- weight building blocks repeated in the polymer chain
plyacrylonitrile PAN
monomers
petroleum
shot size
45. 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
random copolymers
mutual termination
free radical
46. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
plasticizers
thermoplastics
propagation
most common condensation/step- growth polymerization occur between....
47. 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
conformation
condensation/step- growth polymerization
configuration
48. 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
additives
random copolymers
glass transition temperature Tg
barrel
49. An acid and an alcohol
termination
degree of polymerization DPn
most common condensation/step- growth polymerization occur between....
shot size
50. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
relative molecular mass RMM
extruder
screen pack
thermoplastics