Materials Science C

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IcsTam
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Re: Materials Science C

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

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.
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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.
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Re: Materials Science C

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

Describe the function of each of the following: Plasticizer, Filler, Stabilizer, Lubricant.
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Re: Materials Science C

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

Well, this forum seems a little dead, so I'll revitalize it.
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?
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Re: Materials Science C

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

Well, this forum seems a little dead, so I'll revitalize it.
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
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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
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Re: Materials Science C

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

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
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Re: Materials Science C

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

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

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Re: Materials Science C

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

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
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Re: Materials Science C

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


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

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Re: Materials Science C

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

Explain the process of free-radical polymerization.
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Re: Materials Science C

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

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

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Re: Materials Science C

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

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.
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