Questions tagged [polymers]

For questions about synthetic or natural polymers, their chemical or physical properties, and their synthesis, etc.

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43 views

C60 Fullerene Polymers?

Upon scouring Wikipedia for info about fullerenes to research, I came across this paragraph in the page on Buckminsterfullerene (C60): Under high pressure and temperature, repeated [2+2] ...
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1answer
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Combination of polydisperse polymer mixtures

Say I'm given a mixture of batches of polydisperse polymers. I know the weight $w$, the number average $ \bar M_n$, and the weight average $ \bar M_w$ of each batch that was added to the final mixture....
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Siloxane permeable to oxygen but not water

I want to purchase a siloxane plastic that is permeable to air but not to water. Any suggestions for what I should ask for, or are all waterproof silicon plastics permeable to air? Thanks.
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What enzymes can depolymerize plastics? [closed]

One company is making enzymes to depolymerize polyester. What kind of enzyme can that be? Several beings can consume plastics, even some insects, so there has to be some enzymes capable of it.
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I want to clarify a doubt regarding polymers [closed]

What is Glass transition temperature? Justify glass transition temperature of Polyvinyl Alcohol is greater than Polyethylene
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25 views

Breaking of carbon chains due to annihilation of electrons using positron beams

I and my friends were taking part in a competition(physics and chem expertise needed) and we were having a few doubts about something. I was hoping if anyone of you can help in the clarification of ...
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1answer
20 views

Converting pure nylon salt to polymer?

During one of the methods of polymerization: Nylon 6,6 is prepared from polycondensation of hexamethylene diamine (HMD) and adipic acid. The repeat unit of the polymer is $\ce{–[NH(CH2)6 NHCO(...
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51 views

What liquid polymer can turn into a solid when it meets air and can support up to 1000 pounds of force (over a small area) hanging from it? [closed]

Are there any liquid polymers that solidify (possibly by rapid polymerization or chain-linking) when in contact with air, and once so, be able to withstand a weight of 1000 pounds? The substance would ...
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1answer
39 views

Is it appropriate to call this material a hybrid composite? [closed]

The material I've synthesised is made up of two primary parts at a 1:1 ratio: Part 1: agar, glycerol, water. Part 2: polyurethane resin. The agar mixture on its own was too soft, so I added the ...
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Fluorescent polycarbonate changing optical qualities after melting

So I'm trying to figure out how to melt fluorescent poly without it changing. What it's doing after it's melted, under UV it's fluorescing a sort of opaque white instead of it's original color. Keep ...
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hydrodynamic thickness of polymer vs. concentration of electrolyte?

I've measured the hydrodynamic thickness of a NaPSS layer on polystyrene latex and plotted it against the concentration of the supporting electrolyte, NaCl. My graph shows a general decrease in ...
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1answer
20 views

Does PEO particle size decrease when dissolved in water?

I am looking to make metallic ink for inkjet printing and using PEO 1 wt% (MW ~600,000) as a binder. The print head I am hoping to use has a nozzle diameter of 80 microns. The metal powder dispersed ...
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Is the concept of a “self cleaning” banknote plausible?

Although in 2020 there is a big movement of bankers marketers to lean the public towards cashless society, cash in the form of banknotes is still used in many if not most countries. Cash banknotes ...
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1answer
93 views

Is terylene a copolymer?

Terylene is a polyester made from terephthallic acid and ethylene glycol. Even though we use two reagents, they undergo esterification to give bis(2-hydroxyethyl) terephthalate (monomer) which then ...
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1answer
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Why fibres are strong only in one direction? [closed]

Why fibres are strong only in the direction they are oriented?Why they break if we pull at right angle to their orientation? Here each blue line represents combination of polymeric chains.
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3answers
224 views

Acetone-resistant clear plastic

Is there a plastic that's clear, acetone resistant, and ideally sold in sheet stock that's ~1/8" or 1/4" thick? Both acrylic and polycarbonate are out, they turn cloudy on contact with acetone. I ...
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Impregnating polyethylene with oil using pressure cooker?

I have some polyethylene spiral wrap that I'm hoping to impregnate with citrus oil as an animal deterrent. Wikipedia says that polyethylene plastic will pass through "flavourings" fairly easily. It's ...
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1answer
56 views

Polymers which are miscible in oil

Can someone suggest me a list of polymers or some paper where I may find polymers that are soluble in oils like silicon oil, mustard oil, coconut oil, bean oil or petroleum ether, etc.?
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39 views

pH responsive polymer which is immiscible in water?

Can anyone suggest a pH-responsive polymer, which is immiscible in water (polar solvent) but miscible in oil (e.g vegetable oil)? I want to study the change in the density of such polymers when they ...
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Temperature dependence of rubber elastic modulus

Why does the elastic modulus of rubber decrease with temperature? I read the article on rubber elasticity and it showed that modulus is proportional to temperature. But I want to know why( intuitively ...
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46 views

How do you determine if a compound can go through addition polymerisation

For a polymer to form from a monomer, the monomer requires open bonds to attach itself to another monomer. Logically for me, it requires a double bond so I would go for answer C. But can the benzene ...
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1answer
38 views

Does clove oil/eugenol interact with nylon type plastics?

So I am aware that the eugenol in clove oil readily melts #6 type plastic (polystyrene). Polypropylene has a higher resistance, while HDPE type plastics seem to have the highest resistance. My main ...
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Why upon melting of PEO between crossed polars colours appear?

Crystalline PEO when under crossed polars shows distinct Maltese cross pattern. Being birefringent, when polymer crystal align with the polarizer or analyser it shows extinction regions (effect known ...
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Copolymerization regioselectivity

When undergoing copolymerization via free radical mechanism Buna-N forms a certain way. Actual product and possible products Can we predict which of the products will be formed based on the ...
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27 views

Difference between Ziegler–Natta method and Phillips method [closed]

I have to compare the similarities and differences between the Zieglerr–Natta method and Phillips method of producing polyethylene. However, the only difference I can find is the difference in ...
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2answers
103 views

Why polyethylene (PE), wool (polyamide) and cotton (cellulose) burnt with different smells, while they just product CO2 (and N2)?

Both PE and cotton produce CO2, but they distinctly have different smells while being burnt (Burning PE has smell of candle wax, while burning cotton’s smell is like burning leaves). Wool produces CO2 ...
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What does it mean “polyester doesn't breathe”?

Often people say buy a cotton shirt because cotton "breathes" but polyester doesn't. (i.e. it makes you hot sweaty). What is the scientific meaning behind this? How does polyester trap the heat more ...
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2answers
66 views

What does bulk mean when talking about polymers? [closed]

I recently read a paper by Lyulin et al. [1] where they talk about thin films and bulk polymers, I just don't quite understand what they mean by "bulk". Can someone please explain? References ...
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1answer
92 views

Polystyrene properties after dissolved by acetone

Polystyrene plastic can be dissolved in acetone. I would like to understand: If the dissolved polystyrene will take-out of the acetone and becomes solid again (after all the acetone evaporates), will ...
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Cyclohexane as a Solvent

I was wondering, why is cyclohexane used as a solvent in the synthesis of nylon. Typically, I see it being used to dissolved adipose chloride, but why is this the case?
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Super-absorbent Polymers [closed]

I want to cast a cube out of super-absorbent powder (Fake Snow) for an art piece, and make it become shapeless by gradually exposing it to water over 7 days. I have 2 questions: What is the best type ...
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How to get rid needle clogging on electrospinning of PLA/PCL/PMMA/Collagen?

For my thesis research, I dissolved PLA and PCL in chloroform: methanol (3:1), PMMA (350.000 MW, 13 wt%) in acetone, and collagen in acetate acid--and then, I mixed them together. The problem is when ...
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Liquid alternative to alcohol to lower density of water

I am trying to create a suspension of polypropylene particles in a water based liquid. I want the density of the liquid to be more than or equal to the density of polypropylene (855 - 946 kg/m3) so ...
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How to dissolve PLA/PCL/PMMA?

I have a research about electrospun membrane synthesis where I dissolve PLA pellets in chloroform:methanol (3:1) for 3 hours and also PCL pellets in chloroform:methanol (3:1) for 3 hours too. Another ...
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1answer
103 views

Is it possible to have an allotrope of carbon as a long unbranched chain of itself?

Is it possible to have an allotrope of carbon with formula $\ce{(=C=)_n}$? Well, let's actually leave alone the separate question like from which "monomer" would one produce such a thing (can one ...
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Calculate the degree of polymerisation. It's molecular weight and its repeat structure are given

I understand how to calculate the degree of polymerisation normally, but in this question, the extra H and OH outside the bracketed monomer have thrown me off. Do I include their atomic masses in the ...
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what are the cons of converting plastic to fuel

I have been trying to read how to fix plastic problems, there seems to be 3 outstanding solutions Re-use Recycle Decompose to Fuel Recycling is expensive, requires lots of water and the quality ...
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How to remove the foggy discoloration in polycarbonate tubes caused by acetone?

Unknowing that the tubes used in the centrifuge are made of polycarbonate, I cleaned them with acetone. Following, a white smoky discolouration appeared and the tubes turned opaque. Is there any way ...
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How can I explain PEO-b-PLA behaviors in dissolution?

I dissolved PEO 10K - PLLA 14K in toluene at the concentration of $\pu{50 mg/ml}$, $\pu{25 mg/ml}$, and $\pu{5 mg/ml}$ including $\pu{30 min}$ of sonication. When I sonicated them at room temperature,...
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Will acetone dissolve the structure of Spandex?

We are trying to remove rubber from spandex, it's been super-glued on. We know that acetone will dissolve superglue, but we're unsure if acetone will harm Spandex. Anyone that can help us, your input ...
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1answer
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Can common refrigerants be chemically converted into something that is a stable solid at STP? [closed]

I've been thinking how refrigerants - which are highly potent greenhouse gases (hundreds and even thousands of times more potent than CO2) - are likely to be vented to atmosphere eventually either due ...
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1answer
149 views

What are glues/adhesives for cardboard boxes/crates made of?

Open cardboard boxes/crates, often for foodstuffs, are often glued to hold their shape. What is the glue/adhesive made of? I ask to know if it is biodegradable, such that it is suitable for ...
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73 views

What materials reversibly swell up slightly when in a moist environment?

I am aware that some "Super Absorbent Polymers" can swell up enormously when they absorb water. However, I am looking for a material which swells up (maybe about 30% to 100%) when in a moist ...
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41 views

Would the mixture of Latex Rubber and the Squid's chitin make a biodegradable plastic?

I don't know much of Chemistry but I put the chemical structures of each. Thank you!
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1answer
60 views

What makes polyimides good polymers for fibers?

Wikipedia says polyimides are known for “thermal stability, good chemical resistance, excellent mechanical properties”. I guess that's why they're used industrially as fibers. But where do they ...
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What is it mean by Grade in thermoplastics?

I have seen some thermoplastics of the same type categorized by its grade .. What does it mean by that? What does it means the word grade in this context? Is it just a name for slightly differences ...
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Do “random” “2D” polymers constrained to a box actually form “space filling” curves?

Background: The self avoiding walk model is (allegedly) a reasonable model for polymers, at least with respect to certain "universal" (i.e. lattice independent) constants -- see section 1.1. in this ...
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How good is 2-Butoxyethanol as a replacement for acetone?

I have recently bought a bottle of acetone from my local hardware store. When I opened the bottle, I was surprised about the absence of the strong smell of acetone. Only then I discovered the smaller ...
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1answer
26 views

Catalysts to accelerate foamy polyurethane reaction

This is the reaction that I am referring to: https://www.youtube.com/watch?v=EoRUSo0BWC0 I am interested in finding catalysts to accelerate this fun chemistry demonstration. I have heard that some ...
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1answer
77 views

Distribution of polymer lengths

Suppose we have a chemical reaction where a linear chain can form (reversibly) from building blocks (e.g. atoms or molecules): $$\ce{X_$i$ + X_$k$ <=>[$k_\mathrm{fwd}$][$k_\mathrm{rev}$] X_$i$...

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