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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
side groups/ substituents
plasticizers
stabilizers
functionality
2. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
vulcanization
propagation
alternating copolymers
glass transition temperature Tg
3. 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
conformation
free radical
acrylic
relative molecular mass RMM
4. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
extruder
relative molecular mass RMM
thermosets
tow
5. 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
condensation/step- growth polymerization
plasticizers
syndiotactic dyad
weight average molecular weight Mw
6. Number of repeat/structural units in a polymer chain
degree of polymerization DPn
random copolymers
oligomers
acrylic
7. Two or more polymers mechanically mixed together but without covalent bonding between them
polyesters
blends
homopolymer
polymethylmethacrylate PMMA
8. Coloring agents that do not dissolve into the polymer
pigments
degree of polymerization DPn
nylon
polymers
9. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
primary bonding
end groups
additives
most common condensation/step- growth polymerization occur between....
10. Porcess of breaking large organic hydrocarbons into smaller molecules
polypphenylene terephyhalamide PPTA
thermoplastics
cracking
functional groups
11. Additives whose primary purpose is to reduce the final cost of the product
fillers
any carbon with double bonds or repeated substituents
stabilizers
coloring agents
12. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
any carbon with double bonds or repeated substituents
freeze line
blends
rayon
13. Number of bonds a molecule has formed
secondary bonding
functionality
termination
stabilizers
14. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
quenching
constitution
coloring agents
secondary bonding
15. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
plyacrylonitrile PAN
aramid
constitution
pigments
16. 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
step- growth/condensation polymerization
functionality
gauche conformation
structural unit
17. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
trans - conformation
primary termination
graft copolymers
branching
18. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
primary bonding
alternating copolymers
functional groups
nylon
19. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
acrylic
pigments
glass transition temperature Tg
plyacrylonitrile PAN
20. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
polyamides
oligomers
step- growth/condensation polymerization
polyviyl chloride PVC
21. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
secondary bonding
constitution
thermoplastics
any carbon with double bonds or repeated substituents
22. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
trans - conformation
polyamides
vulcanization
coloring agents
23. 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
trans - conformation
degree of polymerization DPn
High volume thermoplastics HVTP
mutual termination
24. Conformation in which the largest substituents are offset by 180
trans - conformation
glass transition temperature Tg
plasticizers
additives
25. Arrangement of the largest substituents where the substituets are offset by 120
addition polymerization/chain growth/free- radical polymerization
staggered conformation
functionality
rayon
26. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
polyamides
rayon
polyesters
poly- p- phenylene benzobisoxazole PBO
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
polyviyl chloride PVC
vinyl monomer
polyurethanes
solution spinning
28. 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
barrel
degree of polymerization DPn
eclipsed conformation/ cis - conformation
copolymer
29. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
thermosets
alternating copolymers
constitution
isotactic dan
30. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
structural unit
polymethylmethacrylate PMMA
nylon
quenching
31. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
primary termination
alternating copolymers
any carbon with double bonds or repeated substituents
random copolymers
32. Conformation that occurs when the largest substituent in a molecule are offset by 60
polypphenylene terephyhalamide PPTA
pigments
random copolymers
gauche conformation
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
screen pack
atactic
spinneret
polypphenylene terephyhalamide PPTA
34. 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
glass transition temperature Tg
plyacrylonitrile PAN
oligomers
gauche conformation
35. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
configuration
constitution
secondary bonding
barrel
36. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
end groups
polymers
polyamides
freeze line
37. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
eclipsed conformation/ cis - conformation
stabilizers
polyviyl chloride PVC
any carbon with double bonds or repeated substituents
38. Is not asymetric and cannot have multiple configurations
structural unit
vulcanization
any carbon with double bonds or repeated substituents
propagation
39. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
acrylic
primary termination
polymers
addition polymerization/chain growth/free- radical polymerization
40. 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
weight average molecular weight Mw
staggered conformation
structural unit
functional groups
41. Broad category of polymers that includes polymers containing urethane linkages
extruder
injection molding
polyurethanes
screen pack
42. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
viscose process
polypphenylene terephyhalamide PPTA
freeze line
plyacrylonitrile PAN
43. 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
eclipsed conformation/ cis - conformation
melt spinning
mutual termination
copolymer
44. Covalently bonded chains of molecules with small monomer units repeated from end to end
plasticizers
side groups/ substituents
polymers
any carbon with double bonds or repeated substituents
45. Carbon atom capable of multiple configurations due to four different substituents
viscose process
oligomers
glass transition temperature Tg
asymetric
46. Covalent bonding of the polymer backbone and side groups
structural unit
primary bonding
coloring agents
copolymer
47. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
spinneret
graft copolymers
nylon
additives
48. Smallest repeating unit in a polymer. aka repeat unit
termination
structural unit
tacticity
staggered conformation
49. Low- molecular- weight building blocks repeated in the polymer chain
polyesters
viscose process
free radical
monomers
50. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
polyamides
elastomers
injection molding
polyesters