Materials Science C

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Re: Materials Science C

Post by Name » February 26th, 2018, 8:37 am

What is vulcanization? What effect does it have on rubber? How does vulcanization molecularly affect the rubber?
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Re: Materials Science C

Post by Tesel » February 26th, 2018, 9:47 am

Name wrote:What is vulcanization? What effect does it have on rubber? How does vulcanization molecularly affect the rubber?
Vulcanization is a process where natural rubber is heated with sulfur. It causes the rubber to become less sticky, more durable, and more useful. It creates sulfur cross-links between the rubber chains, similar to the curing of thermoplastic polymers.
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Re: Materials Science C

Post by Name » February 26th, 2018, 12:33 pm

Tesel wrote:
Name wrote:What is vulcanization? What effect does it have on rubber? How does vulcanization molecularly affect the rubber?
Vulcanization is a process where natural rubber is heated with sulfur. It causes the rubber to become less sticky, more durable, and more useful. It creates sulfur cross-links between the rubber chains, similar to the curing of thermoplastic polymers.
Yup your turn
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Re: Materials Science C

Post by IcsTam » March 3rd, 2018, 3:43 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.
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Re: Materials Science C

Post by Tesel » March 3rd, 2018, 5:53 pm

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.
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.
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Re: Materials Science C

Post by 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.
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

Post by 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

Post by 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

Post by 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?
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Re: Materials Science C

Post by 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
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