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. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
step- growth/condensation polymerization
number average molecular weight Mn
plasticizers
rayon
2. 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
structural unit
plasticizers
propagation
3. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
pigments
quenching
alternating copolymers
shot size
4. 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
injection molding
solution spinning
elastomers
gauche conformation
5. 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
relative molecular mass RMM
copolymer
freeze line
6. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
freeze line
polymethylmethacrylate PMMA
fillers
poly- p- phenylene benzobisoxazole PBO
7. Polymer that is made up a single repeat unit
addition polymerization/chain growth/free- radical polymerization
cracking
homopolymer
primary bonding
8. Pigments or dyes that change the way light is absorbed or reflected by a polymer
step- growth/condensation polymerization
coloring agents
melt spinning
nylon
9. 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
isotactic dan
High volume thermoplastics HVTP
melt spinning
tacticity
10. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
blends
cracking
quenching
thermoplastics
11. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
side groups/ substituents
asymetric
secondary bonding
nylon
12. Simple polymeric material produced as pellets in large quantities
conformation
glass transition temperature Tg
High volume thermoplastics HVTP
shot size
13. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
gauche conformation
polyviyl chloride PVC
viscose process
fillers
14. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
extruder
primary bonding
nylon
asymetric
15. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
blends
spinneret
polymer backbone
graft copolymers
16. Smallest repeating unit in a polymer. aka repeat unit
polymethylmethacrylate PMMA
propagation
syndiotactic dyad
structural unit
17. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
spinneret
aramid
hopper
weight average molecular weight Mw
18. 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
branching
polyurethanes
homopolymer
injection molding
19. 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
homopolymer
number average molecular weight Mn
blends
branching
20. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
secondary bonding
degree of polymerization DPn
primary termination
21. Coloring agents that do not dissolve into the polymer
polypphenylene terephyhalamide PPTA
copolymer
pigments
oligomers
22. Polymer made up of two of more differenet monomers covalently bonded together
melt spinning
copolymer
tow
screen pack
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
aramid
thermoplastics
constitution
relative molecular mass RMM
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
die
eclipsed conformation/ cis - conformation
freeze line
High volume thermoplastics HVTP
25. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
homopolymer
number average molecular weight Mn
aramid
freeze line
26. 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
poly- p- phenylene benzobisoxazole PBO
vulcanization
hopper
step- growth/condensation polymerization
27. 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
coloring agents
poly- p- phenylene benzobisoxazole PBO
isotactic dan
functionality
28. Relative configuration of adjecent asymmetric carbons
primary bonding
side groups/ substituents
polymers
tacticity
29. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
solution spinning
polyurethanes
syndiotactic dyad
primary termination
30. 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
condensation/step- growth polymerization
functionality
coloring agents
weight average molecular weight Mw
31. 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
branching
step- growth/condensation polymerization
shot size
plasticizers
32. An acid and an alcohol
quenching
branching
most common condensation/step- growth polymerization occur between....
extruder
33. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
viscose process
polypphenylene terephyhalamide PPTA
random copolymers
free radical
34. Polymers that contain amide (- N-) groups in the chain
polyamides
eclipsed conformation/ cis - conformation
blends
secondary bonding
35. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
functionality
die
atactic
most common condensation/step- growth polymerization occur between....
36. Number of repeat/structural units in a polymer chain
polyurethanes
oligomers
polyamides
degree of polymerization DPn
37. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
polymers
extruder
glass transition temperature Tg
freeze line
38. Double bounded organic molecule used to begin addition polymerization
vinyl monomer
injection molding
pigments
plasticizers
39. Carbon atom capable of multiple configurations due to four different substituents
asymetric
constitution
High volume thermoplastics HVTP
functionality
40. Arrangement of the largest substituents where the substituets are offset by 120
staggered conformation
pigments
addition polymerization/chain growth/free- radical polymerization
nylon
41. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
initiation
tow
screen pack
polyamides
42. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
shot size
hopper
thermosets
syndiotactic dyad
43. Softening agents
side groups/ substituents
plasticizers
nylon
shot size
44. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
primary bonding
freeze line
glass transition temperature Tg
stabilizers
45. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
structural unit
staggered conformation
termination
most common condensation/step- growth polymerization occur between....
46. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
eclipsed conformation/ cis - conformation
polyesters
polymer backbone
stabilizers
47. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
polypphenylene terephyhalamide PPTA
conformation
barrel
coloring agents
48. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
primary bonding
solution spinning
additives
eclipsed conformation/ cis - conformation
49. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
poly- p- phenylene benzobisoxazole PBO
rayon
High volume thermoplastics HVTP
50. 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
block copolymers
barrel
mutual termination
solution spinning