Questions tagged [polymers]

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

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14 views

What chemical or material could attract plastic?

I'm looking for a material that is affordable, around the 100 USD per kilogram. I'm thinking of a chemical that kind of attracts plastic like a magnet. Thanks!
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What are glues for cardboard boxes/crates made of?

Open cardboard boxes/crates, often for foodstuffs, are often glued to hold their shape. What is the glue made? I ask to know if it is biodegradable (for composting/gardening). My preliminary ...
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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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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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49 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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PAA co PMMA why metacrylic unit is needed?

There is a copolymer of polymethyl metacrylate and polyacrylic acid. What is the point in putting pmma units? What do they bring into polymer?
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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
18 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
69 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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What determines 3D printing material compatibility?

3D printing, specifically the type common for consumers FDM or FFF, involves laying down thin (typically 0.1 to 0.2mm) layers of molten plastic. Modern consumer printers can use various filaments: PLA,...
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54 views

What polymer can be dissolved in ethanol and is insoluble in water?

I need a polymer with parameters noted above. How to determine the solubility theoretically? Hansen/Hildebrand solubility parameters? Wypych is not the ultimate solution...
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Why are my microgels not centrifuging (sticking to tube)?

I have created a hydrogel water in oil emulsion using a microfluidic flow focusing device. I have been able to collect the microgels/particles from the device and then pipette/manipulate them. When I ...
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Will lead bind to dissolved polymer (Kapton) monomers?

We are attempting to determine the concentration of lead impurities in Kapton. Essentially we need to extract lead in the tape polymer Kapton (structure seen below); The amount of lead in the tape is ...
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What is the difference between radii of Gyration and hydrodynamic radii of a polymer? [closed]

Why do you consider that the relationship between RH and RG should depend on the quality of the solvent?
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72 views

Is it possible to arrest the post-actinic effects of photodegradation in ABS polymers?

Polymers like acrylonitrile butadiene styrene (ABS) are adversely effected by UV exposure, both visually (by yellowing) and with regard to other material properties [1]. What's worse is that the ...
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1answer
155 views

Does melting HDPE plastic produce toxic fumes? (melting, not burning)

● The question isn't about burning HDPE but melting it at the proper temperature. (At 120 to 180°C depending on it's density, it becomes gooey. According to the source below the "extrusion" ...
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1answer
241 views

What would happen if I combined this polymer and this metal (assuming I can) [closed]

So let me explain, I recently found out about a material called sorbothane (which is a polymer). Now, sorbothane is special because not only does it highly efficiently absorb shock, but also highly ...
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4k views

Why isn't nylon as strong as kevlar?

Why is Kevlar stronger than nylon? They both contain Hydrogen bonding and should have equal strength but this is not the case instead Kevlar is fire resistant. What makes it stronger. Greater hydrogen ...
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Which Flocculant/Coagulant is ideal for harvesting Algae?

While dealing with Algae fit for human consumption (as protein supplements), which is the most suitable coagulant/Flocculant available? Factors to consider: 1) Cost Effectiveness (for instance poly ...
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1answer
35 views

What does the slash in polymer nomenclature, e.g. Acrylates/ Beheneth-25 Methacrylate Copolymer, mean?

I was given a task to find SDS-Sheets for polymers/microplastic particles in cosmetics and I am confused, since there are often two chemicals divided by "/", e.g. Acrylates/ Beheneth-25 Methacrylate ...
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Can amorphous polymers have a melting temperature as well as their glass transition transition temperature?

Above the Tg, amorphous polymers are described as viscous liquids. What then would they be likened to above their melting point, should they have one?
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Why can't a thermosetting plastic be stretched like an elastomer?

So far I've learnt that there are 2 'types' of thermosets: thermosetting plastics and thermosetting elastomers. Both of them consists of crosslinks that when stretched, allows for the material to ...
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what is the material used to detect the presence of free radicals in the reaction?

To detect the presence of free radicals in the reaction usually, acrylonitrile used but this material is not available in my university. Is there another material used to detect the presence of free ...
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explanation of why interphase occurs in polymers

Im new to chemistry network of stackexchange so please be kind to me! I heard that interphase is created in clay polymer for 2 reasons. one of the reasons is the insoluble part of the polymer and the ...
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1answer
37 views

Is temperature of crystallisation same as melting point temperature for polymers?

Melting point tends to be a temperature range. Is it true that the temperature of crystallisation is the highest temperature at which the polymer melts and thus there is some distinction between ...
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Why isn’t there LDPP, HDPP?

Unlike polyethylene that there are LDPE, HDPE, or LLDPE, when it comes to polypropylene the issue becomes about copolymer (homo/ copo/ block copolymer) or location of methyl group (isotactic/ atactic/ ...
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194 views

Finding the repeating unit of polymerisation given two constituent molecules

The compounds $\ce{H2NCH2CH2NH2}$ and $\ce{HOOCCH2COOH}$ react to form a polymer. What is the structure of the repeating unit of the polymer? A. $\require{enclose}\ce{\enclose{horizontalstrike}{(}...
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218 views

Does propylene glycol dissolve plastic?

According to Médecins Sans Frontières propylene glycol can dissolve plastic: As propylene glycol can dissolve plastic... (Source). Is this claim true? This seems rather spurious to me. If it ...
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Why does the degree of polymerisation remain the same throughout chain-growth polymerisation?

It is known that the degree of polymerisation, which is the average number of monomer units in each polymer chain formed, increases as the reaction proceeds for step-growth polymerisation as longer ...
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36 views

Polymer that has aldehyde and carboxylic acid functional group

I'm currently identifying an unknown polymer sample and I found out from raman spectroscopy that it may contain aldehyde and carboxylic acid functional groups (and possibly ketone too). I was looking ...
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1answer
295 views

Do all polymers contain either carbon or silicon?

Is either carbon or silicon present in every known polymer? If not, is there a small group of elements that, between them, are present in every known polymer, or can polymers be based on a lot of ...
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1answer
19 views

Polyethylene terephtalate Biodegradability [closed]

I'm looking into plastics and how they break down. I have learned 3 ways oxo-biodegradation, photodegradation and thermaldegradation. Does anyone know how PET (polyethylene terephtalate) degrades?
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Can any body Suggest me a set up that I can build it up to study the surface roughness of transparent polymeric fibres?

I need to study the surface of nylon-6 blank fibres with a thickness of nearly 40 micrometre, I work in optics lab with many optical components such as beam splitters, lenses, mirrors ... etc, can I ...
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Where can I look for a short chain photopolymer?

I am by no means an expert in this field, so please be patient with my explanation. I am looking for a photopolymer with very specific properties. I am not sure how realistic it is to find such a ...
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1answer
36 views

Spraying aluminium hydroxide nanoparticles onto PLA as fire retardant?

Several scientific papers study FR-PLA (fire resistant PLA) in which Aluminium Hydroxide nanoparticles are melt blended into the PLA (example source: Advances in Flame Retardant Poly(Lactic Acid). ...
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diamine synthesis

I want to synthesize a new polyimide based on new diamine. In the first step of the synthesis of this diamine, my monomer was added to mixture of 1-chloro-4-nitrobenzene and potassium carbonate in ...
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1answer
28 views

Hardened polyurethane remover

I've looked at the MSDS of a couple of products for removing hardened polyurethane (PU) foam. Both contained only ethanolamine as a dangerous substance, but only between 1-5%. So I'm guessing this ...
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1answer
48 views

Mixing of molecular orbitals in polyatomic molecules

I am trying to solve the following Hamiltonian,$$H=-\frac{1}{2}\nabla^{2}-\sum_{i=1}^{10}\frac{1}{|\vec{r}-\vec{R_{i}}|}$$ Here $Z=1$ . To get all ther molecular orbitals of this system. I took the ...
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Some information about DOWXV503 [closed]

I want to know about the attractor DOWXV503. Is there any scientific book or article about this material? Any information is useful and it will be appreciated.
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724 views

Can a long polymer chain interact with itself via van der Waals forces?

It is known that van der Waals interaction is an intermolecular forces. So is it possible that a long polymer chain interacting with itself via non-bonded interactions (such as van der Waals forces / ...
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1answer
31 views

How can I prevent my spin-coated silica thin film from cracking when I heat it up?

I am spin-coating a porous silica solution on a glass microscope coverslip, and then heating the resulting thin film to $\pu{350 °C}$, in an attempt to create a thin film of porous silica sol gel. I ...
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44 views

Molecular Orbital Mixing to get the Molecular Orbitals of a large molecule

I am trying to get the molecular orbital for arbitrarily placed nuclear centres (identical). In other words , I am trying to solve the following one electron hamiltonian. $$h=-\dfrac{1}{2}\nabla^{2}-\...
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1answer
60 views

In search of a safe and inexpensive solvent that can dissolve depolymerized polypropylene waste plastic

I work at a place where we depolymerize post consumer waste polypropylene waste plastic through a thermal catalytic conversion process. During process shutdown we have to clear up the vessels which ...
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Are linear alkanes polymers? [duplicate]

Let me ask a basic question. Wikipedia defines a polymer as A polymer is a large molecule, or macromolecule, composed of many repeated subunits. Now, can we think of a large linear alkane as a ...
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52 views

Is it possible to make polyethylene in a high school laboratory?

We learned how to make small amounts of ethene from ethanol using sulfuric acid. Is there a way to make a visible amount of polyethylene from that using materials I could get for a school lab? We can'...
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Do self-growing hydrogels grow and strengthen infinitely?

Recently, there was a publication [1] (/., YouTube) on self-growing materials using mechanoradically-generated double-network (DN) hydrogels, closely resembling self-strengthening of muscles. We ...
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1answer
62 views

Adhesion of polymerized fats to cast iron

I'm trying to make an informed decision as to which oil is best to use for cast iron seasoning. I've read all kinds of conflicting information online and the only consistency seems to be that ...
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1answer
183 views

Polymer Chemistry NMR question [closed]

I am extremely new to both polymer chemistry and NMR. I am struggling with the following question: A proton NMR is used to attempt to quantify the molecular weight of a poly(ethylene oxide) molecule ...