Questions tagged [polymers]

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

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21 views

ELI5: What is the effect of ultrafine Teflon (PTFE) particles in rats and mice

I am attempting to research the results of case studies regarding polytetrafluoroethylene [PTFE] (commercially known as Teflon). More specifically I am attempting to make sense of this Abstract on ...
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How to measure the solubility of nylon (or other polymers) in different solvents at different temperatures?

I have to find a suitable solvent for nylon (specifically nylon 6 and nylon 6.6) for reactions and for this purpose I want to measure its solubility in different solvents at different temperatures. ...
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16 views

End Group of Host-Guest Polymers

In synthesizing a host guest polymer, how can a host ion/molecule be included at solely at an extreme/point of the polymer, like an end group in a conventional polymer
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Plastic-eating microbes at home [closed]

I wanted to know if I can nurture a bacteria which is not difficult to find and with time I can train them on harsh chemicals and soon introduce plastic into it with the hope that it will eat it up ...
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Are there certain ratios of styrene/terephthalic acid (TPA) that favor reaction into a copolymer?

The question asks basically if I put styrene in an environment at a certain (T,P) with terephthalic acid, which reaction mechanism will dominate and at what conditions? Styrene will normally react ...
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1answer
30 views

Copolymer purity, what does AN / MA / MS mean?

I would like to buy some polyacrylonitrile (PAN) powder from GoodFellow and I have the choice between these two products: AN316010, quality : Copolymer (99.5% AN / 0.5% MA) AN316020, quality : ...
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34 views

Can a ferrite magnet be impregnated with polymer to reduce its fragility?

Ferrite magnet is a ceramic material and consists of agglomerated crystalline domains with spinel structure. Like other ceramic materials, ferrite magnets are brittle. For example, here is a photo of ...
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42 views

question about electron donor-accpetor polymer

I'm reading a paper about electron-donor-acceptor polymer. Explaining donor unit, the paper says, 'Donor unit refers to an electron-rich unit. Thiophene and benzene are the two most basic donor units, ...
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why is BTD(benzothiadiazole) electron acceptor?

I heard that electron donor is π-electron rich compound, and electron acceptor is π-electron deficient compound in donor-acceptor polymers. https://www.sciencedirect.com/science/article/pii/...
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HCl Concentration vs HDPE Permeation

I've learned that HCl escapes HDPE. I looked up why and it turns out it's because of the small size of the molecule. That factor is unlikely to be affected by the concentration of HCl in water, but I ...
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177 views

Exact meaning of “degree of crosslinking” in polymer chemistry

In the ion-exchange chromatography literature, a term "degree of crosslinking" appears frequently. Ion exchange resins are typically made from divinylbenzene and styrene. One of the stated ...
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1answer
181 views

Chemical to dissolve rubber/latex glove

I seem to have a drain pipe in my flat blocked by what seems to be a latex/rubber glove. I am unable to pull it out — is there a chemical that can reliably dissolve the glove and at the same time not ...
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24 views

Removing ashes of 3d printing resin

I'm not a chemist so excuse me if my question will bite your eye or ear. A resin 3d printing uses polymers that cure under exposure to UV light. There is a special sort of 3d printing resins made for ...
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18 views

Silicone based polymer that can be functionalised on one end?

I am looking for a silicone based polymer (think PDMS but I need to do some chemical reactions with it) where I can attach on one side (or both, I am not sure yet) another molecule that has a ...
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1answer
31 views

Is there an experimental way of measuring the critical concentration of pigment in paint?

With an assigned, generally paint-based, experimental project I've been looking up CPVC or critical pigment volume concentration in binders. CPVC defines the point of addition of pigments after which ...
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How to resolve Amine Blush problems of a Epoxy curing Agent without having to change the temperature and moisture of the air?

The formation of Carbamate as a result of the reaction between amine groups of curing agents and H2O/ CO2 leaves the surface of the cured epoxy with some blurry lines and dots. the typical solutions ...
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143 views

The desirable property of plastics [closed]

My teacher once asked me that "one desirable property of plastics is that they can be made into very complicated shapes, Explain how this is done as a reaction" I never know how to answer ...
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24 views

Dissolving Polystyrene with D-Limonene

I have a product, which according to the MSDS is mostly D-Limonene. I don't have the means to chemically test it, but I did try dissolving polystyrene with it. Before I come check it again, should I ...
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2answers
133 views

Why don't proteins form branched polymers?

My reference book (Princeton Review for SAT Chemistry Subject Test) mentions that: Proteins and carbohydrates are both polymers; however, only carbohydrates commonly form branched polymers. Glycogen ...
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1answer
50 views

What does the number 4-88 mean in “Polyvinylalcohol 4-88”?

Polyvinylalcohol is sold in different forms, one of those is 4-88. What does that number mean?
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41 views

Does silicone hard as plastic exist? [closed]

I saw rubber-like silicones. Are there types of silicone that can be used in injection molding and once the process is finished - become as rigid as, let's say PVC? At the same time they should have ...
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23 views

Permanent ink from urethane, 99% IPA, and pigment?

I’m an artist and I started working with recycled plastic bottles as a material recently. I want to paint the plastic and retain its transparency, but acrylic paint won’t stick without priming and ...
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Does #4 LDPE Plastic Bottle Leach into Water?

I understand that Water Bottles expire due only to the fact that the plastic can degrade over time and leach into the water making the water's taste not as desirable as the manufacturer might intend. ...
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22 views

HDPE vs PP for storing pure aldehydes

I know both HDPE and PP have at least some degree of resistance to aldehydes, esters and aliphatic hydrocarbons. I am concerned however about minute contamination over time of pure samples and so I ...
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1answer
32 views

Relationship between microplastics and wildfire smoke [closed]

My understanding is that: microplastics are short fragments of previously long polymer chains; wildfire smoke largely consists of incompletely burned organic materials such as wood. Wood burns by ...
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1answer
175 views

Polymerization of propene chemical equation [closed]

What is the equation to represent the polymerization of propene? It has to be in the form of general formula: $$\ce{H-R-OH + H-R-OH -> H-R-R-OH + H2O}$$ I have this so far: $$\ce{CH3-CH=CH2-OH + ...
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1answer
472 views

What do “USP 26” and “USP 42” mean?

I am being asked by a colleague if the Polyvinylpyrrolidone (PVP) we buy in our lab is "USP 26" or "USP 42". I've never heard those terms before. I searched up online but found ...
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Remove sticky PDMS from glasses slides

I prepared some PDMS mixing a Sylgard 186 (elastomer) and a curing agent with 10:1 ratio. I sucked all the bubbles and I sandwiched the PDMS between two glass slides to get flat surfaces. Finally I ...
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How can I solubilize fragrance oil into polyvinyl acetate/clear glue?

I'm a high school student who makes slime for fun, using polyvinyl acetate (PVA) glue and borax as my main ingredients. Earlier, I had the idea of adding fragrance oils to clear glue. However, because ...
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1answer
41 views

Are there any natural thermosetting polymers?

Is eggwhite a natural thermoset? A thermoset is a material that is usually liquid, but it solidifies upon heat. Once it's set, trying to melt it by heating it will only solidify it further until it ...
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What is the influence of citrate on PEG-modified polyacrylamide hydrogels?

I've been having a puzzle explaining the experimental results with the citrate anions and PEG modified polyacrylamide: According to the experimental data there is a hydrogel swelling whenever citrate ...
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3answers
1k views

How can I draw alpha helices in ChemDraw?

I am trying to draw a polyisocyanopeptide with different kinds of monomeric units that intramolecularly interact with one another. However, I wanted to show these connections with its carbon backbone ...
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Does anyone have experience with polycaprolactone?

I am trying to create an emulsion from polycaprolactone. My efforts thus far have resulted in unstable emulsions which sediment and coalesce after some time. This is what I have tried: Dissolve 5g of ...
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26 views

Why is the end of a roll of cling film worse at sticking to itself?

I've noticed, with various brands of cling film, that as you get close to the end of the roll it does a much worse job of clinging to itself. Is there a chemical reason for this? Maybe something to do ...
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2answers
173 views

Research-backed articles on cast iron seasoning

I've always seasoned my cast iron pans with vegetable oil because that was what I was taught. I'd done some research before, and even came across this StackExchange post on asking the best oil for the ...
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1answer
112 views

Polymerisation of a UV-curing resin

I have a photosensitive resin MSDS. It lists a mixture of 1,6-Hexanediol diacrylate ($\ce{C_{12}H_{18}O_4}$) with its proper CAS number and Polyurethane acrylate together with the CAS number of "...
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3answers
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Is benzene a polymer of ethyne?

In one of my classes, my teacher told me that benzene can be formed by cyclic polymerization of ethyne. But I think that benzene isn't a polymer because only 3 ethyne molecules are combining to form ...
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1answer
116 views

How to bond polymer to polymer (TPU on PMMA)

I wanted to bond TPU films to PMMA slab. I have tried thermal bonding but it is was not practical(I do not know why?). Can anyone please give me a method to bound them? Thanks
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1answer
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I want to purposefully dry up (polymerize) an entire bottle of ethyl cyanoacrylate (Super Glue). How to do it?

So, I want to do some tests with the solid form of ethyl cyanoacrylate. I have a small 20g bottle which was very cheap so I don't mind. How can I cause the entire contents of the bottle to set and ...
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40 views

Is RDP (redispersible polymer powder) and PVA (polyvinyl acetate) same?

I am a freshman in chemistry and looking for additives to the alpha Gypsum plaster to make its surface hardness stone-like and gain it more flowability when pouring, my composition for making the ...
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1answer
164 views

Reaction between ammonia and dichloromethane [closed]

Could ammonia displace a chloride in dichloromethane to form a methylammonia? If so, given enough reagents and time, could this be used to make a 3D structure comprised of nitrogen bonded carbons, and ...
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1answer
64 views

Shape of PEG in water

According to the chemical formula $\ce{H−(O−CH2−CH2)_n−OH}$ of polyethylene glycol, or PEG, I assume that this organic compound has a long chain structure when it is dry and in powder form. (This is ...
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34 views

Permeability of Nafion membrane

Nafion membrane is used as a proton exchange membrane (PEM) in fuel cells due to its selectively high permeability to hydronium ions $(\ce{H3O+})$ and water. A permeability study was done on small ...
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1answer
153 views

Chain transfer agents and rate of free radical polymerization

In free radical addition polymerizations sometimes chain transfer agents are added. From what I understand chain transfer agents (e.g. XR' below) reduce the average molecular weight by transferring ...
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1answer
208 views

How to determine the source of PVA: crude or plant-based?

We're a small startup company looking to make products using ingredients solely derived from plants. One of the main ingredients in one of our products is polyvinyl alcohol (PVA). We have found a ...
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32 views

What would be the best combination to clean polyurethane [closed]

I am struggling to find the best composition to clean old golf balls and make them white again. The balls are made out of different types of coating, e.g. polyurethane or an isomer. I have found ...
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1answer
25 views

Will toluene vapors damage a mirror made from PETG?

I'm working on a project for work and trying to avoid using an acrylic mirror because I know that doesn't hold up well against toluene, but I'm wondering if a mirror made out of PETG would?
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26 views

Can PDMS silicone be produced with dichloromethane?

I was taking a simulated admission test for a Technology Institute (Brazilian ITA) and one of the questions asked for the production of PDMS silicone via these described steps: Reaction of $\ce{SiO2}$...
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1answer
27 views

Safe coating to make a 3D printed respirator mask airtight [closed]

What is a good example of something safe that could be applied as a coating layer to the walls of a 3D printed respirator mask to make them truly airtight (seal pores and fissures) while (ideally) ...
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23 views

How can the torsional barrier of a polymer determined by molecular dynamics?

First consider a simple polymer, like polyacetylene: Its torsional barrier can be determined by DFT calculations by considering "enough" units and performing a simple dihedral scan. "Enough" appears ...

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