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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
eclipsed conformation/ cis - conformation
syndiotactic dyad
constitution
polymers
2. 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
glass transition temperature Tg
additives
petroleum
isotactic dan
3. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
constitution
eclipsed conformation/ cis - conformation
poly- p- phenylene benzobisoxazole PBO
melt spinning
4. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
random copolymers
primary termination
staggered conformation
degree of polymerization DPn
5. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
additives
thermosets
polymers
barrel
6. Conformation in which the largest substituents are offset by 180
trans - conformation
staggered conformation
functional groups
asymetric
7. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
thermosets
oligomers
polymer backbone
atactic
8. 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
barrel
weight average molecular weight Mw
viscose process
polyamides
9. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
propagation
polymethylmethacrylate PMMA
staggered conformation
alternating copolymers
10. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
constitution
coloring agents
plyacrylonitrile PAN
syndiotactic dyad
11. First step in the process of polymerization - during which a free radical is formed
initiation
dyes
branching
spinneret
12. Covalently bonded chains of molecules with small monomer units repeated from end to end
coloring agents
polymers
homopolymer
tacticity
13. Arrangement of the largest substituents where the substituets are offset by 120
elastomers
step- growth/condensation polymerization
staggered conformation
acrylic
14. 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
aramid
branching
acrylic
poly- p- phenylene benzobisoxazole PBO
15. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
thermoplastics
extruder
alternating copolymers
tow
16. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
tow
primary termination
graft copolymers
polymer backbone
17. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
trans - conformation
glass transition temperature Tg
functional groups
hopper
18. 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
block copolymers
alternating copolymers
viscose process
termination
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
initiation
termination
primary bonding
polyesters
20. Simple polymeric material produced as pellets in large quantities
free radical
High volume thermoplastics HVTP
thermoplastics
elastomers
21. 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
viscose process
plasticizers
configuration
free radical
22. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
hopper
viscose process
acrylic
block copolymers
23. Number of bonds a molecule has formed
mutual termination
side groups/ substituents
configuration
functionality
24. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
side groups/ substituents
homopolymer
spinneret
vulcanization
25. Conformation that occurs when the largest substituent in a molecule are offset by 60
primary bonding
isotactic dan
side groups/ substituents
gauche conformation
26. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polyviyl chloride PVC
plasticizers
dyes
barrel
27. Double bounded organic molecule used to begin addition polymerization
structural unit
screen pack
vinyl monomer
barrel
28. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
polymethylmethacrylate PMMA
plyacrylonitrile PAN
nylon
primary bonding
29. Low- molecular- weight building blocks repeated in the polymer chain
pigments
monomers
acrylic
vinyl monomer
30. An acid and an alcohol
most common condensation/step- growth polymerization occur between....
poly- p- phenylene benzobisoxazole PBO
staggered conformation
High volume thermoplastics HVTP
31. Polymer made up of two of more differenet monomers covalently bonded together
copolymer
plyacrylonitrile PAN
propagation
relative molecular mass RMM
32. Relative configuration of adjecent asymmetric carbons
polypphenylene terephyhalamide PPTA
syndiotactic dyad
dyes
tacticity
33. 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
polyurethanes
relative molecular mass RMM
shot size
cracking
34. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
configuration
eclipsed conformation/ cis - conformation
trans - conformation
condensation/step- growth polymerization
35. Carbon atom capable of multiple configurations due to four different substituents
primary bonding
asymetric
relative molecular mass RMM
plasticizers
36. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
stabilizers
polyviyl chloride PVC
freeze line
acrylic
37. Softening agents
shot size
barrel
gauche conformation
plasticizers
38. Number of repeat/structural units in a polymer chain
mutual termination
degree of polymerization DPn
polyesters
fillers
39. Polymers that contain amide (- N-) groups in the chain
functionality
quenching
polyamides
vinyl monomer
40. One type of polymer that contains at least 85% of polyacrylonitrile PAN
isotactic dan
acrylic
blends
plasticizers
41. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
eclipsed conformation/ cis - conformation
primary termination
branching
polypphenylene terephyhalamide PPTA
42. Atoms attached to the polymer backbone.
melt spinning
side groups/ substituents
hopper
random copolymers
43. Two or more polymers mechanically mixed together but without covalent bonding between them
plasticizers
atactic
polyesters
blends
44. 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
pigments
functional groups
melt spinning
addition polymerization/chain growth/free- radical polymerization
45. 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
end groups
polyviyl chloride PVC
polyesters
barrel
46. Polymer that is made up a single repeat unit
homopolymer
branching
polymer backbone
pigments
47. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
constitution
injection molding
random copolymers
functional groups
48. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
addition polymerization/chain growth/free- radical polymerization
secondary bonding
aramid
block copolymers
49. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
viscose process
spinneret
High volume thermoplastics HVTP
pigments
50. Smallest repeating unit in a polymer. aka repeat unit
rayon
polyesters
structural unit
monomers