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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. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
copolymer
pigments
constitution
random copolymers
2. Porcess of breaking large organic hydrocarbons into smaller molecules
thermosets
rayon
pigments
cracking
3. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
vulcanization
additives
asymetric
graft copolymers
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
polyviyl chloride PVC
most common condensation/step- growth polymerization occur between....
side groups/ substituents
barrel
5. Primary raw material for most polymers
petroleum
primary bonding
end groups
injection molding
6. Number of repeat/structural units in a polymer chain
plasticizers
degree of polymerization DPn
block copolymers
step- growth/condensation polymerization
7. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
dyes
side groups/ substituents
freeze line
free radical
8. Covalently bonded chains of molecules with small monomer units repeated from end to end
vinyl monomer
degree of polymerization DPn
polymers
isotactic dan
9. 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
stabilizers
configuration
condensation/step- growth polymerization
gauche conformation
10. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
polymer backbone
polyviyl chloride PVC
plasticizers
isotactic dan
11. Softening agents
end groups
plasticizers
coloring agents
eclipsed conformation/ cis - conformation
12. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
tow
graft copolymers
weight average molecular weight Mw
cracking
13. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
atactic
degree of polymerization DPn
polyamides
initiation
14. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
extruder
structural unit
viscose process
solution spinning
15. 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
blends
plasticizers
coloring agents
relative molecular mass RMM
16. Double bounded organic molecule used to begin addition polymerization
side groups/ substituents
vinyl monomer
conformation
primary bonding
17. Atoms attached to the polymer backbone.
side groups/ substituents
free radical
shot size
die
18. 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
cracking
glass transition temperature Tg
side groups/ substituents
19. 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
copolymer
polyesters
glass transition temperature Tg
alternating copolymers
20. Pigments or dyes that change the way light is absorbed or reflected by a polymer
extruder
thermosets
elastomers
coloring agents
21. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
free radical
copolymer
petroleum
oligomers
22. Polymer made up of two of more differenet monomers covalently bonded together
plasticizers
polymers
copolymer
hopper
23. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
syndiotactic dyad
polymethylmethacrylate PMMA
structural unit
acrylic
24. Arrangement of the largest substituents where the substituets are offset by 120
configuration
constitution
glass transition temperature Tg
staggered conformation
25. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
extruder
die
degree of polymerization DPn
poly- p- phenylene benzobisoxazole PBO
26. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
secondary bonding
syndiotactic dyad
aramid
primary termination
27. 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
solution spinning
random copolymers
side groups/ substituents
freeze line
28. Simple polymeric material produced as pellets in large quantities
structural unit
polypphenylene terephyhalamide PPTA
High volume thermoplastics HVTP
copolymer
29. Conformation that occurs when the largest substituent in a molecule are offset by 60
petroleum
aramid
gauche conformation
barrel
30. Number of bonds a molecule has formed
polymethylmethacrylate PMMA
plasticizers
functionality
nylon
31. Two or more polymers mechanically mixed together but without covalent bonding between them
coloring agents
addition polymerization/chain growth/free- radical polymerization
blends
freeze line
32. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
petroleum
conformation
elastomers
configuration
33. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
initiation
syndiotactic dyad
rayon
screen pack
34. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
number average molecular weight Mn
plyacrylonitrile PAN
injection molding
polymer backbone
35. Conformation in which the largest substituents are offset by 180
end groups
polyviyl chloride PVC
trans - conformation
coloring agents
36. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
asymetric
syndiotactic dyad
vinyl monomer
barrel
37. Molecule containing a highly reactive unpaired electron
thermoplastics
polymers
free radical
freeze line
38. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
number average molecular weight Mn
copolymer
constitution
polypphenylene terephyhalamide PPTA
39. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
cracking
extruder
freeze line
spinneret
40. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
functional groups
High volume thermoplastics HVTP
trans - conformation
nylon
41. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
degree of polymerization DPn
graft copolymers
polyamides
isotactic dan
42. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
hopper
acrylic
addition polymerization/chain growth/free- radical polymerization
thermosets
43. Covalent bonding of the polymer backbone and side groups
dyes
screen pack
primary bonding
thermoplastics
44. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
dyes
free radical
viscose process
termination
45. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
melt spinning
eclipsed conformation/ cis - conformation
end groups
configuration
46. One type of polymer that contains at least 85% of polyacrylonitrile PAN
acrylic
isotactic dan
branching
barrel
47. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
branching
plyacrylonitrile PAN
nylon
additives
48. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
primary bonding
polymers
mutual termination
poly- p- phenylene benzobisoxazole PBO
49. Low- molecular- weight building blocks repeated in the polymer chain
monomers
isotactic dan
structural unit
cracking
50. Coloring agents that do not dissolve into the polymer
polyesters
pigments
elastomers
mutual termination