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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 that is made up a single repeat unit
homopolymer
syndiotactic dyad
polyamides
elastomers
2. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
vulcanization
solution spinning
polymer backbone
petroleum
3. 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
homopolymer
monomers
poly- p- phenylene benzobisoxazole PBO
4. 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
gauche conformation
aramid
relative molecular mass RMM
primary bonding
5. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
branching
polyviyl chloride PVC
shot size
stabilizers
6. First step in the process of polymerization - during which a free radical is formed
condensation/step- growth polymerization
initiation
tacticity
plyacrylonitrile PAN
7. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
most common condensation/step- growth polymerization occur between....
constitution
additives
oligomers
8. Number of repeat/structural units in a polymer chain
screen pack
plasticizers
vinyl monomer
degree of polymerization DPn
9. Arrangement of the largest substituents where the substituets are offset by 120
block copolymers
polyamides
staggered conformation
condensation/step- growth polymerization
10. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
glass transition temperature Tg
step- growth/condensation polymerization
propagation
polymer backbone
11. Configuration of a substituent in a polymer - in which the substituent is located on the same side of the polymer chain in all repeating units
polymers
isotactic dan
primary bonding
tow
12. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
stabilizers
polypphenylene terephyhalamide PPTA
die
step- growth/condensation polymerization
13. Covalent bonding of the polymer backbone and side groups
vinyl monomer
eclipsed conformation/ cis - conformation
primary bonding
glass transition temperature Tg
14. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
gauche conformation
polyviyl chloride PVC
plasticizers
functional groups
15. Double bounded organic molecule used to begin addition polymerization
side groups/ substituents
vinyl monomer
nylon
High volume thermoplastics HVTP
16. Porcess of breaking large organic hydrocarbons into smaller molecules
gauche conformation
mutual termination
relative molecular mass RMM
cracking
17. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
eclipsed conformation/ cis - conformation
atactic
primary termination
secondary bonding
18. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
eclipsed conformation/ cis - conformation
initiation
graft copolymers
thermosets
19. 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
High volume thermoplastics HVTP
poly- p- phenylene benzobisoxazole PBO
solution spinning
20. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
asymetric
extruder
polyurethanes
staggered conformation
21. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
syndiotactic dyad
end groups
polyviyl chloride PVC
thermoplastics
22. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
copolymer
polyamides
extruder
shot size
23. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
freeze line
secondary bonding
configuration
hopper
24. Low- molecular- weight building blocks repeated in the polymer chain
monomers
quenching
vinyl monomer
primary termination
25. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
aramid
configuration
hopper
26. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
constitution
structural unit
hopper
end groups
27. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
number average molecular weight Mn
tow
vinyl monomer
28. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
tow
atactic
polypphenylene terephyhalamide PPTA
configuration
29. Pigments or dyes that change the way light is absorbed or reflected by a polymer
primary termination
extruder
graft copolymers
coloring agents
30. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
additives
degree of polymerization DPn
petroleum
copolymer
31. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
dyes
primary termination
shot size
atactic
32. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
polymers
oligomers
barrel
poly- p- phenylene benzobisoxazole PBO
33. 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
side groups/ substituents
number average molecular weight Mn
conformation
die
34. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
secondary bonding
random copolymers
melt spinning
poly- p- phenylene benzobisoxazole PBO
35. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
eclipsed conformation/ cis - conformation
initiation
graft copolymers
36. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
plyacrylonitrile PAN
termination
vinyl monomer
structural unit
37. 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
glass transition temperature Tg
additives
branching
blends
38. Polymer made up of two of more differenet monomers covalently bonded together
tow
plasticizers
dyes
copolymer
39. Polymers that contain amide (- N-) groups in the chain
polyamides
pigments
nylon
tacticity
40. 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
configuration
structural unit
glass transition temperature Tg
asymetric
41. 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
solution spinning
weight average molecular weight Mw
polymer backbone
step- growth/condensation polymerization
42. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
polyamides
polymethylmethacrylate PMMA
polypphenylene terephyhalamide PPTA
dyes
43. An acid and an alcohol
polymethylmethacrylate PMMA
nylon
pigments
most common condensation/step- growth polymerization occur between....
44. Softening agents
coloring agents
degree of polymerization DPn
High volume thermoplastics HVTP
plasticizers
45. Relative configuration of adjecent asymmetric carbons
dyes
addition polymerization/chain growth/free- radical polymerization
aramid
tacticity
46. Conformation that occurs when the largest substituent in a molecule are offset by 60
end groups
structural unit
dyes
gauche conformation
47. 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
atactic
number average molecular weight Mn
end groups
polymethylmethacrylate PMMA
48. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
plasticizers
quenching
copolymer
freeze line
49. Simple polymeric material produced as pellets in large quantities
stabilizers
barrel
High volume thermoplastics HVTP
initiation
50. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
coloring agents
acrylic
polypphenylene terephyhalamide PPTA
thermoplastics