Materials Science C

Test your knowledge of various Science Olympiad events.
IcsTam
Member
Member
Posts: 58
Joined: March 1st, 2017, 5:09 pm
Division: C
State: PA

Re: Materials Science C

Postby IcsTam » March 3rd, 2018, 8:29 pm

Tesel wrote:
IcsTam wrote:I'm just going to post a question, if that's alright.

1. What is a copolymer?
2. Describe and differentiate between a random, alternating, block, and graft copolymer.


Yep, my bad.

Answer
1. A copolymer contains multiple different monomer units.
2A. A random copolymer has monomers randomly ordered, e.g. ABAAABBAABABBBAAB.
2B. An alternating copolymer has regularly alternating monomer units, e.g. ABABABAB.
2C. A block copolymer consists of multiple "blocks" which each contain only one type of monomer, e.g. AAAABBBBAAAAABBB.
2D. A graft copolymer has one type of monomer on the main chain and a different type of monomer on the side chains. In other words, one chain is "grafted" onto the other.


Assuming I'm right, I'll just post the next question, to make sure I don't forget.

Describe the "melting process" for:
1. Amorphous thermoplastic polymers.
2. Crystalline thermoplastic polymers.
3. Thermoset polymers.


Amorphous plastics do not have a sharp melting point; rather, regions of the polymer soften as the temperature increases. Crystalline thermoplastic polymers have a sharp melting point and change to a liquid once that point is met fairly quickly. Thermoset polymers do not melt.
Penncrest ‘18
UPenn ‘22
PM me about UPenn, Physics, or anything college or SciOly related!

Tesel
Exalted Member
Exalted Member
Posts: 161
Joined: January 30th, 2016, 8:03 pm
Division: C
State: MI

Re: Materials Science C

Postby Tesel » March 3rd, 2018, 8:50 pm

Yep, well done. I'd reference the glass transition point for amorphous materials on a test.
University of Michigan Science Olympiad Div. C Event Lead

2018 MI Mission Possible State Champions

IcsTam
Member
Member
Posts: 58
Joined: March 1st, 2017, 5:09 pm
Division: C
State: PA

Re: Materials Science C

Postby IcsTam » March 3rd, 2018, 8:57 pm

Describe the function of each of the following: Plasticizer, Filler, Stabilizer, Lubricant.
Penncrest ‘18
UPenn ‘22
PM me about UPenn, Physics, or anything college or SciOly related!

JavaScriptCoder
Member
Member
Posts: 27
Joined: February 18th, 2018, 6:56 am
Division: C
State: IL

Re: Materials Science C

Postby JavaScriptCoder » April 8th, 2018, 1:02 pm

Well, this forum seems a little dead, so I'll revitalize it.

IcsTam wrote:Describe the function of each of the following: Plasticizer, Filler, Stabilizer, Lubricant.


A plasticizer makes a material less brittle, a filler (name is a bit self-explanatory) fills gaps, a stabilizer prevents the breakdown of an emulsion (from what I've learned liquid-liquid colloids are insanely unstable) and a lubricant decreases friction.

Is it right?
"Our average flight time for the helicopter was 1.8 seconds before regionals. At regionals it flew for 25 seconds" - Helicopters Team 2018

Here to help!~

IcsTam
Member
Member
Posts: 58
Joined: March 1st, 2017, 5:09 pm
Division: C
State: PA

Re: Materials Science C

Postby IcsTam » April 8th, 2018, 5:46 pm

JavaScriptCoder wrote:Well, this forum seems a little dead, so I'll revitalize it.

IcsTam wrote:Describe the function of each of the following: Plasticizer, Filler, Stabilizer, Lubricant.


A plasticizer makes a material less brittle, a filler (name is a bit self-explanatory) fills gaps, a stabilizer prevents the breakdown of an emulsion (from what I've learned liquid-liquid colloids are insanely unstable) and a lubricant decreases friction.

Is it right?


So for filler, I would specify that it improves tensile strength and directional stability in the polymer. Otherwise, that's right! Your turn
Penncrest ‘18
UPenn ‘22
PM me about UPenn, Physics, or anything college or SciOly related!

User avatar
Name
Member
Member
Posts: 275
Joined: January 21st, 2018, 4:41 pm
Division: C
State: NY
Location: Syosset

Re: Materials Science C

Postby Name » April 8th, 2018, 8:21 pm

To speed things up can we post and answer simultaneously and if the answer is incorrect, correct them later? Because this thread is going kinda slowly
South Woods MS (5 medals)/Syosset HS (24 medals)
Favorite Past Events: Microbe, Invasive, Matsci, Fermi
Next Year: Astro, Code, hopefully Orni, and maybe Compound
2018-19 highlights
mit- 1st code, 3rd fermi
cornell- 1st fermi
states- 1st fermi, 3rd astro, 3rd code
19 medals

IcsTam
Member
Member
Posts: 58
Joined: March 1st, 2017, 5:09 pm
Division: C
State: PA

Re: Materials Science C

Postby IcsTam » April 9th, 2018, 5:27 am

Name wrote:To speed things up can we post and answer simultaneously and if the answer is incorrect, correct them later? Because this thread is going kinda slowly


Works for me, I definitely want this to move faster
Penncrest ‘18
UPenn ‘22
PM me about UPenn, Physics, or anything college or SciOly related!

JavaScriptCoder
Member
Member
Posts: 27
Joined: February 18th, 2018, 6:56 am
Division: C
State: IL

Re: Materials Science C

Postby JavaScriptCoder » April 9th, 2018, 11:29 am

IcsTam wrote:
JavaScriptCoder wrote:Well, this forum seems a little dead, so I'll revitalize it.

IcsTam wrote:Describe the function of each of the following: Plasticizer, Filler, Stabilizer, Lubricant.


A plasticizer makes a material less brittle, a filler (name is a bit self-explanatory) fills gaps, a stabilizer prevents the breakdown of an emulsion (from what I've learned liquid-liquid colloids are insanely unstable) and a lubricant decreases friction.

Is it right?


So for filler, I would specify that it improves tensile strength and directional stability in the polymer. Otherwise, that's right! Your turn


Ok, name this chemical (I think it could be covered in materials science):

Image
"Our average flight time for the helicopter was 1.8 seconds before regionals. At regionals it flew for 25 seconds" - Helicopters Team 2018

Here to help!~

IcsTam
Member
Member
Posts: 58
Joined: March 1st, 2017, 5:09 pm
Division: C
State: PA

Re: Materials Science C

Postby IcsTam » April 11th, 2018, 12:34 pm

JavaScriptCoder wrote:
IcsTam wrote:
JavaScriptCoder wrote:Well, this forum seems a little dead, so I'll revitalize it.



A plasticizer makes a material less brittle, a filler (name is a bit self-explanatory) fills gaps, a stabilizer prevents the breakdown of an emulsion (from what I've learned liquid-liquid colloids are insanely unstable) and a lubricant decreases friction.

Is it right?


So for filler, I would specify that it improves tensile strength and directional stability in the polymer. Otherwise, that's right! Your turn


Ok, name this chemical (I think it could be covered in materials science):

Image


Benzoyl Cyanide
Penncrest ‘18
UPenn ‘22
PM me about UPenn, Physics, or anything college or SciOly related!

JavaScriptCoder
Member
Member
Posts: 27
Joined: February 18th, 2018, 6:56 am
Division: C
State: IL

Re: Materials Science C

Postby JavaScriptCoder » April 12th, 2018, 11:04 am

IcsTam wrote:
JavaScriptCoder wrote:
IcsTam wrote:
So for filler, I would specify that it improves tensile strength and directional stability in the polymer. Otherwise, that's right! Your turn


Ok, name this chemical (I think it could be covered in materials science):

Image


Benzoyl Cyanide


Very well, I'll give that to you. The IUPAC name is technically phenylglyoxylnitrile but it is more commonly known as that. Your turn (make sure to include your question in the answer so it goes faster).
"Our average flight time for the helicopter was 1.8 seconds before regionals. At regionals it flew for 25 seconds" - Helicopters Team 2018

Here to help!~

IcsTam
Member
Member
Posts: 58
Joined: March 1st, 2017, 5:09 pm
Division: C
State: PA

Re: Materials Science C

Postby IcsTam » April 12th, 2018, 1:08 pm

Explain the process of free-radical polymerization.
Penncrest ‘18
UPenn ‘22
PM me about UPenn, Physics, or anything college or SciOly related!

JavaScriptCoder
Member
Member
Posts: 27
Joined: February 18th, 2018, 6:56 am
Division: C
State: IL

Re: Materials Science C

Postby JavaScriptCoder » April 19th, 2018, 6:25 am

IcsTam wrote:Explain the process of free-radical polymerization.


Free-radicals are particles that have unpaired valence electrons. The process of free radical polymerization is like chain-growth polymerization: Free radicals append themselves to the end of the polymer chain.

Next question.
Image.
Name the points on the stress-strain curve (1, 2, 3, 4).

BONUS POINTS:
Image
Which of these curves is most likely to be representative of a thermoplastic polymer? (Getting the images without labels was the hardest part tbh)
"Our average flight time for the helicopter was 1.8 seconds before regionals. At regionals it flew for 25 seconds" - Helicopters Team 2018

Here to help!~

IcsTam
Member
Member
Posts: 58
Joined: March 1st, 2017, 5:09 pm
Division: C
State: PA

Re: Materials Science C

Postby IcsTam » April 22nd, 2018, 12:15 pm

JavaScriptCoder wrote:
IcsTam wrote:Explain the process of free-radical polymerization.


Free-radicals are particles that have unpaired valence electrons. The process of free radical polymerization is like chain-growth polymerization: Free radicals append themselves to the end of the polymer chain.

Next question.
Image.
Name the points on the stress-strain curve (1, 2, 3, 4).

BONUS POINTS:
Image
Which of these curves is most likely to be representative of a thermoplastic polymer? (Getting the images without labels was the hardest part tbh)


1 is the material at rest (is there a more precise term for this?). 2 is the yield point. 3 is the ultimate tensile strength. 4 is fracture

BONUS: Red curve is thermoplastic.


Explain what compression and injection molding are and the difference between the two.
Penncrest ‘18
UPenn ‘22
PM me about UPenn, Physics, or anything college or SciOly related!


Return to “2018 Question Marathons”

Who is online

Users browsing this forum: No registered users and 3 guests