/* */
SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
|
Email
Search
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. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
spinneret
polyurethanes
trans - conformation
injection molding
2. Coloring agents that do not dissolve into the polymer
monomers
pigments
mutual termination
graft copolymers
3. Is not asymetric and cannot have multiple configurations
step- growth/condensation polymerization
any carbon with double bonds or repeated substituents
atactic
petroleum
4. Number of bonds a molecule has formed
fillers
coloring agents
monomers
functionality
5. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
High volume thermoplastics HVTP
copolymer
mutual termination
functional groups
6. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
relative molecular mass RMM
melt spinning
configuration
graft copolymers
7. 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
cracking
additives
High volume thermoplastics HVTP
weight average molecular weight Mw
8. Conformation that occurs when the largest substituent in a molecule are offset by 60
plasticizers
gauche conformation
primary bonding
most common condensation/step- growth polymerization occur between....
9. 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
polyviyl chloride PVC
thermoplastics
oligomers
block copolymers
10. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
polyamides
additives
side groups/ substituents
most common condensation/step- growth polymerization occur between....
11. Conformation in which the largest substituents are offset by 180
trans - conformation
additives
plasticizers
polyamides
12. 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
injection molding
primary termination
hopper
glass transition temperature Tg
13. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
most common condensation/step- growth polymerization occur between....
dyes
screen pack
14. 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
plasticizers
melt spinning
plyacrylonitrile PAN
degree of polymerization DPn
15. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
additives
monomers
syndiotactic dyad
die
16. First step in the process of polymerization - during which a free radical is formed
condensation/step- growth polymerization
aramid
initiation
freeze line
17. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
mutual termination
aramid
constitution
end groups
18. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polyviyl chloride PVC
elastomers
blends
polymers
19. Molecule containing a highly reactive unpaired electron
poly- p- phenylene benzobisoxazole PBO
free radical
freeze line
polymethylmethacrylate PMMA
20. Number of repeat/structural units in a polymer chain
conformation
High volume thermoplastics HVTP
solution spinning
degree of polymerization DPn
21. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
syndiotactic dyad
thermoplastics
secondary bonding
polypphenylene terephyhalamide PPTA
22. Double bounded organic molecule used to begin addition polymerization
melt spinning
vinyl monomer
pigments
copolymer
23. Broad category of polymers that includes polymers containing urethane linkages
solution spinning
most common condensation/step- growth polymerization occur between....
die
polyurethanes
24. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
freeze line
acrylic
extruder
plyacrylonitrile PAN
25. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
eclipsed conformation/ cis - conformation
additives
shot size
structural unit
26. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
pigments
High volume thermoplastics HVTP
primary termination
tow
27. Pigments or dyes that change the way light is absorbed or reflected by a polymer
initiation
coloring agents
stabilizers
extruder
28. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
end groups
pigments
any carbon with double bonds or repeated substituents
29. Additives whose primary purpose is to reduce the final cost of the product
vulcanization
fillers
addition polymerization/chain growth/free- radical polymerization
cracking
30. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
injection molding
random copolymers
tow
addition polymerization/chain growth/free- radical polymerization
31. 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
nylon
tacticity
monomers
step- growth/condensation polymerization
32. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
primary termination
structural unit
solution spinning
propagation
33. Arrangement of the largest substituents where the substituets are offset by 120
weight average molecular weight Mw
polyurethanes
branching
staggered conformation
34. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
alternating copolymers
branching
hopper
die
35. 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
thermosets
oligomers
aramid
36. Covalently bonded chains of molecules with small monomer units repeated from end to end
termination
shot size
gauche conformation
polymers
37. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
coloring agents
tow
vulcanization
plasticizers
38. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
screen pack
stabilizers
plasticizers
initiation
39. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
relative molecular mass RMM
primary bonding
quenching
asymetric
40. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
random copolymers
fillers
alternating copolymers
41. 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
atactic
polyurethanes
plasticizers
solution spinning
42. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
structural unit
homopolymer
High volume thermoplastics HVTP
thermosets
43. 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
die
functionality
polymethylmethacrylate PMMA
tacticity
44. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
propagation
functionality
termination
shot size
45. 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
polypphenylene terephyhalamide PPTA
isotactic dan
stabilizers
relative molecular mass RMM
46. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
plasticizers
barrel
polymethylmethacrylate PMMA
polymers
47. 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
die
pigments
48. 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
mutual termination
functionality
gauche conformation
polypphenylene terephyhalamide PPTA
49. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
petroleum
constitution
elastomers
eclipsed conformation/ cis - conformation
50. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
thermoplastics
acrylic
configuration
mutual termination
//
//