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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. Softening agents
any carbon with double bonds or repeated substituents
plasticizers
dyes
aramid
2. Low- molecular- weight building blocks repeated in the polymer chain
acrylic
monomers
primary termination
functionality
3. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
gauche conformation
polymer backbone
initiation
nylon
4. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
quenching
mutual termination
plasticizers
poly- p- phenylene benzobisoxazole PBO
5. 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
isotactic dan
side groups/ substituents
polymer backbone
pigments
6. Conformation that occurs when the largest substituent in a molecule are offset by 60
gauche conformation
relative molecular mass RMM
plasticizers
nylon
7. Pigments or dyes that change the way light is absorbed or reflected by a polymer
High volume thermoplastics HVTP
quenching
coloring agents
termination
8. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
constitution
side groups/ substituents
blends
melt spinning
9. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
polymethylmethacrylate PMMA
polymers
propagation
additives
10. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
plasticizers
primary bonding
plyacrylonitrile PAN
propagation
11. Is not asymetric and cannot have multiple configurations
thermosets
spinneret
any carbon with double bonds or repeated substituents
aramid
12. 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
oligomers
viscose process
petroleum
relative molecular mass RMM
13. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
polyviyl chloride PVC
hopper
block copolymers
free radical
14. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
alternating copolymers
polymer backbone
viscose process
tow
15. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
trans - conformation
blends
configuration
primary termination
16. Molecule containing a highly reactive unpaired electron
free radical
any carbon with double bonds or repeated substituents
cracking
constitution
17. Number of repeat/structural units in a polymer chain
trans - conformation
degree of polymerization DPn
pigments
vulcanization
18. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
melt spinning
copolymer
primary bonding
19. An acid and an alcohol
screen pack
structural unit
atactic
most common condensation/step- growth polymerization occur between....
20. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
injection molding
oligomers
petroleum
21. 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
polymethylmethacrylate PMMA
alternating copolymers
plyacrylonitrile PAN
glass transition temperature Tg
22. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
syndiotactic dyad
propagation
initiation
plasticizers
23. Arrangement of the largest substituents where the substituets are offset by 120
acrylic
nylon
cracking
staggered conformation
24. Smallest repeating unit in a polymer. aka repeat unit
structural unit
random copolymers
stabilizers
vinyl monomer
25. Porcess of breaking large organic hydrocarbons into smaller molecules
screen pack
cracking
glass transition temperature Tg
primary bonding
26. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
staggered conformation
thermoplastics
eclipsed conformation/ cis - conformation
isotactic dan
27. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
stabilizers
extruder
graft copolymers
propagation
28. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
atactic
branching
isotactic dan
addition polymerization/chain growth/free- radical polymerization
29. Conformation in which the largest substituents are offset by 180
branching
trans - conformation
coloring agents
glass transition temperature Tg
30. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
poly- p- phenylene benzobisoxazole PBO
coloring agents
injection molding
31. 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
staggered conformation
secondary bonding
thermoplastics
mutual termination
32. 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
solution spinning
condensation/step- growth polymerization
graft copolymers
step- growth/condensation polymerization
33. 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
structural unit
plasticizers
weight average molecular weight Mw
stabilizers
34. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
block copolymers
any carbon with double bonds or repeated substituents
tow
graft copolymers
35. 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
termination
tacticity
primary bonding
weight average molecular weight Mw
36. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
quenching
tacticity
side groups/ substituents
37. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
dyes
random copolymers
extruder
poly- p- phenylene benzobisoxazole PBO
38. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
most common condensation/step- growth polymerization occur between....
alternating copolymers
termination
nylon
39. Additives whose primary purpose is to reduce the final cost of the product
secondary bonding
fillers
coloring agents
branching
40. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
trans - conformation
number average molecular weight Mn
syndiotactic dyad
graft copolymers
41. Covalently bonded chains of molecules with small monomer units repeated from end to end
die
freeze line
propagation
polymers
42. Simple polymeric material produced as pellets in large quantities
High volume thermoplastics HVTP
alternating copolymers
primary bonding
number average molecular weight Mn
43. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
thermoplastics
die
polypphenylene terephyhalamide PPTA
polyviyl chloride PVC
44. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
secondary bonding
primary termination
vulcanization
additives
45. Coloring agents that do not dissolve into the polymer
degree of polymerization DPn
staggered conformation
pigments
graft copolymers
46. 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
secondary bonding
side groups/ substituents
pigments
block copolymers
47. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
configuration
rayon
cracking
staggered conformation
48. Carbon atom capable of multiple configurations due to four different substituents
alternating copolymers
asymetric
condensation/step- growth polymerization
solution spinning
49. Atoms attached to the polymer backbone.
hopper
side groups/ substituents
structural unit
plyacrylonitrile PAN
50. 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
condensation/step- growth polymerization
polyurethanes
melt spinning
extruder