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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. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
any carbon with double bonds or repeated substituents
extruder
number average molecular weight Mn
primary termination
2. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
High volume thermoplastics HVTP
conformation
polyurethanes
3. Simple polymeric material produced as pellets in large quantities
High volume thermoplastics HVTP
stabilizers
termination
weight average molecular weight Mw
4. 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
addition polymerization/chain growth/free- radical polymerization
polymers
syndiotactic dyad
5. 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
stabilizers
free radical
branching
tow
6. 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
spinneret
extruder
homopolymer
7. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
polymer backbone
step- growth/condensation polymerization
weight average molecular weight Mw
graft copolymers
8. 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
addition polymerization/chain growth/free- radical polymerization
mutual termination
tow
injection molding
9. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
syndiotactic dyad
fillers
graft copolymers
hopper
10. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
extruder
eclipsed conformation/ cis - conformation
elastomers
mutual termination
11. Covalently bonded chains of molecules with small monomer units repeated from end to end
tow
trans - conformation
alternating copolymers
polymers
12. 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
configuration
isotactic dan
coloring agents
fillers
13. Broad category of polymers that includes polymers containing urethane linkages
conformation
configuration
structural unit
polyurethanes
14. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
staggered conformation
block copolymers
side groups/ substituents
poly- p- phenylene benzobisoxazole PBO
15. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
glass transition temperature Tg
initiation
tow
rayon
16. Softening agents
vinyl monomer
plasticizers
rayon
staggered conformation
17. Polymer that is made up a single repeat unit
aramid
screen pack
homopolymer
injection molding
18. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
vinyl monomer
elastomers
polypphenylene terephyhalamide PPTA
hopper
19. First step in the process of polymerization - during which a free radical is formed
initiation
relative molecular mass RMM
syndiotactic dyad
random copolymers
20. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
polyamides
polyesters
tacticity
functional groups
21. 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
plasticizers
isotactic dan
coloring agents
block copolymers
22. Double bounded organic molecule used to begin addition polymerization
polyamides
secondary bonding
solution spinning
vinyl monomer
23. 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
thermosets
relative molecular mass RMM
weight average molecular weight Mw
termination
24. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
random copolymers
thermoplastics
coloring agents
polymers
25. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
poly- p- phenylene benzobisoxazole PBO
plyacrylonitrile PAN
glass transition temperature Tg
copolymer
26. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
rayon
structural unit
polyesters
polymers
27. 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
secondary bonding
High volume thermoplastics HVTP
rayon
28. Primary raw material for most polymers
petroleum
spinneret
condensation/step- growth polymerization
glass transition temperature Tg
29. 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
branching
mutual termination
step- growth/condensation polymerization
alternating copolymers
30. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
polypphenylene terephyhalamide PPTA
vulcanization
propagation
coloring agents
31. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
homopolymer
spinneret
additives
tow
32. 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
polyamides
petroleum
plyacrylonitrile PAN
melt spinning
33. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
petroleum
shot size
glass transition temperature Tg
freeze line
34. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
functionality
freeze line
conformation
monomers
35. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
most common condensation/step- growth polymerization occur between....
configuration
aramid
polyviyl chloride PVC
36. Molecule containing a highly reactive unpaired electron
syndiotactic dyad
staggered conformation
free radical
gauche conformation
37. Conformation that occurs when the largest substituent in a molecule are offset by 60
constitution
gauche conformation
polymethylmethacrylate PMMA
eclipsed conformation/ cis - conformation
38. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
addition polymerization/chain growth/free- radical polymerization
free radical
random copolymers
quenching
39. Low- molecular- weight building blocks repeated in the polymer chain
freeze line
monomers
polymethylmethacrylate PMMA
extruder
40. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
viscose process
acrylic
spinneret
thermoplastics
41. 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
petroleum
polymer backbone
glass transition temperature Tg
primary bonding
42. 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
alternating copolymers
elastomers
primary termination
weight average molecular weight Mw
43. An acid and an alcohol
asymetric
most common condensation/step- growth polymerization occur between....
tow
screen pack
44. Is not asymetric and cannot have multiple configurations
polyamides
polypphenylene terephyhalamide PPTA
any carbon with double bonds or repeated substituents
die
45. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
elastomers
random copolymers
polymers
tacticity
46. Additives whose primary purpose is to reduce the final cost of the product
number average molecular weight Mn
fillers
functional groups
thermoplastics
47. Conformation in which the largest substituents are offset by 180
alternating copolymers
trans - conformation
extruder
degree of polymerization DPn
48. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
any carbon with double bonds or repeated substituents
nylon
addition polymerization/chain growth/free- radical polymerization
secondary bonding
49. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
pigments
shot size
vinyl monomer
vulcanization
50. Atoms attached to the polymer backbone.
trans - conformation
side groups/ substituents
mutual termination
thermosets