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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. Simple polymeric material produced as pellets in large quantities
atactic
vulcanization
polyviyl chloride PVC
High volume thermoplastics HVTP
2. 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
stabilizers
vinyl monomer
copolymer
solution spinning
3. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
branching
constitution
barrel
conformation
4. Atoms attached to the polymer backbone.
poly- p- phenylene benzobisoxazole PBO
initiation
plasticizers
side groups/ substituents
5. Primary raw material for most polymers
petroleum
dyes
vinyl monomer
end groups
6. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
eclipsed conformation/ cis - conformation
atactic
polypphenylene terephyhalamide PPTA
addition polymerization/chain growth/free- radical polymerization
7. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
fillers
functionality
polypphenylene terephyhalamide PPTA
atactic
8. 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
pigments
tacticity
relative molecular mass RMM
most common condensation/step- growth polymerization occur between....
9. One type of polymer that contains at least 85% of polyacrylonitrile PAN
polyviyl chloride PVC
acrylic
propagation
petroleum
10. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
propagation
secondary bonding
functional groups
spinneret
11. Covalent bonding of the polymer backbone and side groups
glass transition temperature Tg
primary bonding
polyamides
screen pack
12. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
dyes
isotactic dan
addition polymerization/chain growth/free- radical polymerization
rayon
13. 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
syndiotactic dyad
condensation/step- growth polymerization
extruder
glass transition temperature Tg
14. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
secondary bonding
aramid
polymethylmethacrylate PMMA
tow
15. Softening agents
functional groups
eclipsed conformation/ cis - conformation
blends
plasticizers
16. Broad category of polymers that includes polymers containing urethane linkages
conformation
polyurethanes
polyesters
cracking
17. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
staggered conformation
propagation
oligomers
fillers
18. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
plyacrylonitrile PAN
tow
oligomers
rayon
19. 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
tacticity
melt spinning
monomers
polyurethanes
20. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
High volume thermoplastics HVTP
polymer backbone
solution spinning
mutual termination
21. 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
tow
step- growth/condensation polymerization
homopolymer
High volume thermoplastics HVTP
22. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
eclipsed conformation/ cis - conformation
rayon
termination
polymer backbone
23. Polymer that is made up a single repeat unit
free radical
alternating copolymers
homopolymer
monomers
24. First step in the process of polymerization - during which a free radical is formed
melt spinning
initiation
block copolymers
die
25. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
atactic
polyamides
asymetric
quenching
26. 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
number average molecular weight Mn
homopolymer
plasticizers
asymetric
27. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
graft copolymers
relative molecular mass RMM
end groups
vinyl monomer
28. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
branching
conformation
hopper
polyesters
29. 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
viscose process
tow
injection molding
glass transition temperature Tg
30. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
condensation/step- growth polymerization
any carbon with double bonds or repeated substituents
poly- p- phenylene benzobisoxazole PBO
extruder
31. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
plasticizers
copolymer
injection molding
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
petroleum
weight average molecular weight Mw
secondary bonding
tacticity
33. Polymers that contain amide (- N-) groups in the chain
functional groups
polyamides
gauche conformation
oligomers
34. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
constitution
viscose process
any carbon with double bonds or repeated substituents
polyamides
35. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
alternating copolymers
functional groups
primary bonding
block copolymers
36. Molecule containing a highly reactive unpaired electron
free radical
functionality
primary bonding
alternating copolymers
37. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
graft copolymers
additives
aramid
tacticity
38. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
injection molding
extruder
polyviyl chloride PVC
stabilizers
39. 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
oligomers
vinyl monomer
addition polymerization/chain growth/free- radical polymerization
die
40. Number of repeat/structural units in a polymer chain
polyviyl chloride PVC
conformation
degree of polymerization DPn
asymetric
41. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
polyesters
pigments
injection molding
cracking
42. Conformation in which the largest substituents are offset by 180
polyamides
copolymer
staggered conformation
trans - conformation
43. 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
polyesters
poly- p- phenylene benzobisoxazole PBO
propagation
vulcanization
44. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
polyurethanes
functionality
plyacrylonitrile PAN
tow
45. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
side groups/ substituents
syndiotactic dyad
plasticizers
graft copolymers
46. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
constitution
side groups/ substituents
primary termination
eclipsed conformation/ cis - conformation
47. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
most common condensation/step- growth polymerization occur between....
viscose process
nylon
tacticity
48. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
monomers
mutual termination
thermoplastics
shot size
49. Coloring agents that do not dissolve into the polymer
vulcanization
pigments
degree of polymerization DPn
shot size
50. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
plyacrylonitrile PAN
random copolymers
step- growth/condensation polymerization
blends