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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. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
polymethylmethacrylate PMMA
screen pack
configuration
High volume thermoplastics HVTP
2. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
block copolymers
viscose process
vulcanization
alternating copolymers
3. Molecule containing a highly reactive unpaired electron
acrylic
thermosets
free radical
number average molecular weight Mn
4. 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
initiation
stabilizers
barrel
tow
5. Number of bonds a molecule has formed
addition polymerization/chain growth/free- radical polymerization
vulcanization
secondary bonding
functionality
6. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
thermosets
hopper
barrel
asymetric
7. Porcess of breaking large organic hydrocarbons into smaller molecules
addition polymerization/chain growth/free- radical polymerization
thermosets
cracking
dyes
8. 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
pigments
hopper
nylon
solution spinning
9. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
polyurethanes
elastomers
secondary bonding
shot size
10. First step in the process of polymerization - during which a free radical is formed
polyesters
free radical
nylon
initiation
11. Carbon atom capable of multiple configurations due to four different substituents
branching
coloring agents
asymetric
dyes
12. Conformation in which the largest substituents are offset by 180
trans - conformation
polymer backbone
injection molding
screen pack
13. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
constitution
polymer backbone
quenching
mutual termination
14. Covalently bonded chains of molecules with small monomer units repeated from end to end
cracking
High volume thermoplastics HVTP
polymers
mutual termination
15. Double bounded organic molecule used to begin addition polymerization
syndiotactic dyad
vinyl monomer
tacticity
screen pack
16. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
stabilizers
viscose process
eclipsed conformation/ cis - conformation
syndiotactic dyad
17. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
trans - conformation
polyamides
High volume thermoplastics HVTP
elastomers
18. Arrangement of the largest substituents where the substituets are offset by 120
staggered conformation
syndiotactic dyad
propagation
nylon
19. 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
isotactic dan
plasticizers
condensation/step- growth polymerization
polymer backbone
20. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
monomers
configuration
petroleum
gauche conformation
21. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
oligomers
eclipsed conformation/ cis - conformation
extruder
freeze line
22. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
polyesters
plasticizers
melt spinning
rayon
23. 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
monomers
quenching
mutual termination
24. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
plasticizers
graft copolymers
injection molding
homopolymer
25. 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
homopolymer
branching
poly- p- phenylene benzobisoxazole PBO
weight average molecular weight Mw
26. 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
elastomers
end groups
most common condensation/step- growth polymerization occur between....
block copolymers
27. Polymer that is made up a single repeat unit
vinyl monomer
homopolymer
polymethylmethacrylate PMMA
quenching
28. Covalent bonding of the polymer backbone and side groups
secondary bonding
pigments
shot size
primary bonding
29. 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
degree of polymerization DPn
freeze line
number average molecular weight Mn
functional groups
30. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
polypphenylene terephyhalamide PPTA
thermoplastics
initiation
atactic
31. Additives whose primary purpose is to reduce the final cost of the product
plasticizers
melt spinning
fillers
elastomers
32. 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
extruder
trans - conformation
propagation
33. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
random copolymers
eclipsed conformation/ cis - conformation
configuration
pigments
34. Smallest repeating unit in a polymer. aka repeat unit
copolymer
atactic
structural unit
branching
35. Simple polymeric material produced as pellets in large quantities
any carbon with double bonds or repeated substituents
free radical
High volume thermoplastics HVTP
vulcanization
36. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
oligomers
alternating copolymers
solution spinning
additives
37. 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
thermosets
plasticizers
addition polymerization/chain growth/free- radical polymerization
most common condensation/step- growth polymerization occur between....
38. Pigments or dyes that change the way light is absorbed or reflected by a polymer
condensation/step- growth polymerization
High volume thermoplastics HVTP
coloring agents
initiation
39. 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
atactic
melt spinning
most common condensation/step- growth polymerization occur between....
plyacrylonitrile PAN
40. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
die
functional groups
isotactic dan
vinyl monomer
41. Coloring agents that do not dissolve into the polymer
pigments
coloring agents
oligomers
secondary bonding
42. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
barrel
degree of polymerization DPn
vulcanization
shot size
43. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
stabilizers
aramid
poly- p- phenylene benzobisoxazole PBO
atactic
44. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
structural unit
tow
termination
stabilizers
45. Two or more polymers mechanically mixed together but without covalent bonding between them
thermosets
blends
fillers
polymethylmethacrylate PMMA
46. 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
homopolymer
isotactic dan
mutual termination
end groups
47. Atoms attached to the polymer backbone.
weight average molecular weight Mw
side groups/ substituents
addition polymerization/chain growth/free- radical polymerization
coloring agents
48. Number of repeat/structural units in a polymer chain
atactic
degree of polymerization DPn
monomers
copolymer
49. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
dyes
functional groups
acrylic
plasticizers
50. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
die
random copolymers
viscose process
graft copolymers