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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. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
relative molecular mass RMM
atactic
barrel
step- growth/condensation polymerization
2. Conformation that occurs when the largest substituent in a molecule are offset by 60
gauche conformation
atactic
step- growth/condensation polymerization
blends
3. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
pigments
thermoplastics
plasticizers
polypphenylene terephyhalamide PPTA
4. 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
polyurethanes
mutual termination
cracking
structural unit
5. Smallest repeating unit in a polymer. aka repeat unit
structural unit
propagation
free radical
plasticizers
6. Conformation in which the largest substituents are offset by 180
trans - conformation
tow
functional groups
injection molding
7. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
polyurethanes
High volume thermoplastics HVTP
initiation
8. 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
polyamides
conformation
constitution
melt spinning
9. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
gauche conformation
secondary bonding
nylon
isotactic dan
10. 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
condensation/step- growth polymerization
injection molding
polymethylmethacrylate PMMA
tacticity
11. 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
additives
any carbon with double bonds or repeated substituents
branching
pigments
12. 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
thermoplastics
secondary bonding
condensation/step- growth polymerization
glass transition temperature Tg
13. Atoms attached to the polymer backbone.
melt spinning
polypphenylene terephyhalamide PPTA
configuration
side groups/ substituents
14. Polymer that is made up a single repeat unit
barrel
homopolymer
polymethylmethacrylate PMMA
stabilizers
15. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
propagation
staggered conformation
polymer backbone
relative molecular mass RMM
16. Molecule containing a highly reactive unpaired electron
free radical
isotactic dan
block copolymers
vulcanization
17. Two or more polymers mechanically mixed together but without covalent bonding between them
blends
asymetric
isotactic dan
staggered conformation
18. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
functional groups
plyacrylonitrile PAN
aramid
quenching
19. Polymers that contain amide (- N-) groups in the chain
polyamides
viscose process
condensation/step- growth polymerization
barrel
20. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
thermosets
functional groups
quenching
polyamides
21. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
screen pack
tow
condensation/step- growth polymerization
polyurethanes
22. Coloring agents that do not dissolve into the polymer
High volume thermoplastics HVTP
pigments
petroleum
polyesters
23. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
High volume thermoplastics HVTP
screen pack
dyes
rayon
24. Polymer made up of two of more differenet monomers covalently bonded together
copolymer
mutual termination
plyacrylonitrile PAN
plasticizers
25. 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
gauche conformation
solution spinning
secondary bonding
addition polymerization/chain growth/free- radical polymerization
26. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
tow
termination
isotactic dan
viscose process
27. 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
primary bonding
structural unit
step- growth/condensation polymerization
copolymer
28. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
atactic
functional groups
coloring agents
primary termination
29. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
staggered conformation
High volume thermoplastics HVTP
elastomers
plasticizers
30. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
aramid
initiation
coloring agents
freeze line
31. Primary raw material for most polymers
vulcanization
thermoplastics
petroleum
random copolymers
32. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
homopolymer
oligomers
addition polymerization/chain growth/free- radical polymerization
polyviyl chloride PVC
33. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
polymers
trans - conformation
thermoplastics
constitution
34. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
polyviyl chloride PVC
conformation
High volume thermoplastics HVTP
stabilizers
35. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
fillers
syndiotactic dyad
injection molding
High volume thermoplastics HVTP
36. Low- molecular- weight building blocks repeated in the polymer chain
any carbon with double bonds or repeated substituents
quenching
rayon
monomers
37. 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
blends
polypphenylene terephyhalamide PPTA
weight average molecular weight Mw
thermoplastics
38. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
configuration
stabilizers
viscose process
poly- p- phenylene benzobisoxazole PBO
39. Carbon atom capable of multiple configurations due to four different substituents
asymetric
High volume thermoplastics HVTP
stabilizers
plyacrylonitrile PAN
40. 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
blends
tow
die
graft copolymers
41. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
injection molding
graft copolymers
block copolymers
thermosets
42. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
structural unit
configuration
secondary bonding
acrylic
43. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
cracking
viscose process
termination
end groups
44. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
primary bonding
primary termination
random copolymers
termination
45. An acid and an alcohol
primary termination
most common condensation/step- growth polymerization occur between....
polymer backbone
cracking
46. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
isotactic dan
shot size
alternating copolymers
spinneret
47. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
dyes
relative molecular mass RMM
petroleum
termination
48. Pigments or dyes that change the way light is absorbed or reflected by a polymer
coloring agents
structural unit
stabilizers
glass transition temperature Tg
49. 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
plyacrylonitrile PAN
primary termination
barrel
dyes
50. 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
relative molecular mass RMM
homopolymer
thermosets