Questions tagged [polymers]

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

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Synthesis of polypropylene

So, I have two questions regarding the synthesis of polypropylene: I have tried looking everywhere but couldn't find a detailed mechanism for the termination step of the synthesis of polypropylene (...
Guy Weizman's user avatar
-2 votes
0 answers
59 views

Sellmeier coefficients of UV curable adhesive made of methacrylate [closed]

I measure devices using a UV curable adhesive for optics whose main component is modified methacrylate. I would like to know the Sellmeier coefficients of the material after this adhesive has cured ...
user6695701's user avatar
8 votes
1 answer
993 views

What is 'spray foam' or 'expanding foam'?

At the wikipedia are: Spray foam (expanding foam in the UK) is a chemical product created by two materials, isocyanate and polyol resin, which react when mixed with each other and expand up to 30-60 ...
Imyaf's user avatar
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Difference between polyethylene sulfonate and Nafion?

Nafion is a cation-exchange membrane that I would like to build a chlor-alkali cell, but unfortunately it's crazy expensive(and comes in ridiculously large sizes). Its functional group, the sulfonate ...
interestedperson's user avatar
-1 votes
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Can triethylamine be substituted for pyridine as a base catalyst in acryloylation reaction?

I work in a polymer research lab and I'm writing a procedure to synthesize glycerol 1,3 diacrylate but in almost all the reactions I've been reading, the synthesis occurs at hot temperatures(60 C) and ...
MorningBirds's user avatar
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Replacing calcium acetate with sodium polyacrylate for homemade Sterno?

I was researching making canned heat using denatured(ethyl) alcohol, water, and calcium acetate from scratch. However, it occured to me that sodium polyacrylate also absorbs water and alcohol and is ...
0x6869's user avatar
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3 votes
2 answers
134 views

Could polydiazene exist?

I am a bit new to the world of chemistry, and after messing around on ChemSpider, I had a thought. Could a polymer like this exist: Due to VSEPR, it would be shaped pretty weirdly and N-N single ...
shan's user avatar
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Is there a name for polymer structures that resemble a foldable lattice?

I'm struggling to find the right descriptors for this, but it would look like this I've been doing some layperson reading up on stretchy materials, and I know a lot of them work by the polymer chains ...
AncientSwordRage's user avatar
2 votes
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32 views

Small-Angle X-Ray Scattering of Bulk Polymers

Does anyone have any recommendations on how to get useful information from SAXS of polymers when the system is not dilute? This is the type of data we're working with: My understanding is that since ...
polythenesam's user avatar
3 votes
0 answers
103 views

Chemical Mechanism Behind Water-Soluble Ink

I came across water-soluble ink pens designed for creating temporary fabric marks, particularly in cross-stitch stamping. These ink dissolve in water, transforming water into a colorful liquid, while ...
Fast Snail's user avatar
1 vote
0 answers
29 views

Does polyamide react with hydrocarbons (group III engine oil) in its thermoplastic state?

I need to form (bend) thermoplastic polyamide hose in rubber jacket to a desired shape. I can use heat gun but I thought for better results I could use heated to 150C group III engine oil (your ...
Yoda's user avatar
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liquid (solution or polymer) with a density of more than 1.35g/cm3 and with element atomic numbers less than 9

Search for a liquid (solution or polymer) with a density of more than $\pu{1.35 g/cm3}$ and containing only elements with an atomic number less than 9. For example, a saturated solution of sugar in ...
Vladimir Magidenko's user avatar
3 votes
0 answers
28 views

Can multispectral imaging be used for identification of materials, substituting for hyperspectral imaging?

Nowadays a lot of research and applications are using Hyperspectral Imaging for identification and segregation of plastics by material. But the cost of a HSI system is quite high. Could a ...
Aether's user avatar
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5 votes
0 answers
58 views

Dependence of elasticity on temperature and degree of vulcanization of typical commercial rubber band

I am doing a school experiment that tries to find how the elasticity of rubber band depends on temperature. From all the research I have done, theory suggests stress to increase linearly with ...
Simon's user avatar
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How to remove color from bromostyrene/dibromostyrene

Distillation under low heat can remove color (excess bromine) but this is time consuming and there is a danger of bromostyrene polymerization even with added TBC. In aqueous, sodium thiosulphate can ...
Don Volk's user avatar
0 votes
1 answer
46 views

Can plastic items of same type but different rigidity be recycled together?

Quite often we find plastic items of different rigidity which belong to same type. For instance, LDPE is used mostly for films and bags, but sometimes thick and rigid containers are also made. Can we (...
Aether's user avatar
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1 vote
1 answer
460 views

Assignment of NMR peaks of polystyrene

I’m having trouble identifying the peak around 3,75 ppm in the 1H-NMR spectrum of polystyrene measured at 400 Hz in CDCl3. Could someone please provide their perspective on it? I see it appear in a ...
yumocci's user avatar
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2 votes
1 answer
60 views

Does Sugru (Formerol) decay underwater?

Sugru is described as waterproof and dishwasher-safe, but I still wonder if it will decay quickly (within months) if submerged in room-temperature tap water. Aren't silicone rubbers susceptible to ...
MWB's user avatar
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29 views

Which is more stable, a secondary allylic carbanion or a primary allylic carbanion?

I came across this picture in a polymer chemistry course, specifically on anionic polymerization of conjugated dienes (butadiene). I dont understand why the secondary carbanion is more stable. Based ...
Dannis's user avatar
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1 vote
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Thermoplastics crystallization during nonisothermal cooling cycles

I have tested a PAEK family polymer using differential scanning calorimetry (DSC) with heating-cooling-heating cycles under different cooling rates (heating rates remained unchanged). PAEK are semi-...
Rod's user avatar
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1 vote
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Can polychloroprene further react

Chloroprene undergoes radical polymerisation to form polychloroprene. Chloroprene is a special structure since it has two carbon-carbon double bonds and it turns out that polychloroprene also has one ...
Freeby Freeby's user avatar
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1 answer
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cellophane bags

I am conducting an experiment to test the components of a cello bag. I believe that cello bags do not just contain cellulose, and as mentioned by many websites, only 92-98%, but not 100% of the bag is ...
Freeby Freeby's user avatar
2 votes
0 answers
159 views

How to dissolve paraformaldehyde in solvent without using water?

In the chloromethylation reaction of polysulfone (PSU), I am required to use paraformaldehyde and trimethylchlorosilane as the chloromethylating agent while stannic chloride as the catalyst. I ...
Majda Br's user avatar
1 vote
1 answer
48 views

Adding colours to polymers

It is said that some polymers can be dyed, but I am not sure about the mechanism behind. Let me take an example. In anodization, aluminium oxide can be coloured since there are tiny pores for the ink ...
Chemistry is fun's user avatar
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193 views

Why does ethanol decrease viscosity of a high pH carbomer solution more compared to water

Carbomer 407 is made up of acrylic acid that undergoes polymerisation to form a long linear structure. At higher pH, the carboxylic acid functional groups will dissociate to form carboxylate ions. ...
Mike's user avatar
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0 votes
1 answer
77 views

What resin is appropriate for construction of a gasoline/ethanol fuel tank

I am building a epoxy resin/glass reinforced plastic (epoxy/GRP) gasoline tank. The expected service life is 30 years. I've read that epoxy is relatively resistant to gasoline (some better than others)...
Woody's user avatar
  • 109
-1 votes
1 answer
71 views

What is that substance coming from tractor tire?

I have old tractor with Bridgestone tires. When I press a clean white tissue against the tire, a black spot show on the tissue. Is that substance carbon black and it’s harmful to soil?
MasterMind's user avatar
1 vote
0 answers
27 views

What is the diffusivity of colloidal Formazine in water?

I have synthesized Foramzine in an aqueous solution (turbidity = 4000 NTU), and will be further diluting it. I would like to know the diffusion coefficient (diffusivity/mass diffusivity) of colloidal ...
optomechanic's user avatar
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0 answers
17 views

Is the "heat or UV" necessary for PVC10 + Cl => CPVC10 catalytic or endothermic and if endothermic how much energy?

Production of Chlorinated PolyVinyl Chloride (CPVC) from PVC and chlorine requires incorporating about one part chlorine in 10 PCV to achieve around 63% chlorine mass CPVC. This reaction is "...
James Bowery's user avatar
2 votes
0 answers
45 views

Why is sodium p-toluenesulfonate used as a supporting electrolyte in polypyrrole synthesis?

First, some preamble: I'm currently working on my thesis, which is about the electropolymerization of polypyrrole onto carbon fiber felt. My methodology, for the most part, follows a paper by one of ...
user136415's user avatar
1 vote
0 answers
32 views

Can an epoxy resin create a terpene polymer?

I am developing plant-based antifouling coatings that will stop barnacles binding to ship hulls for example. I have started simply by mixing specific terpenes with an epoxy resin (BISPHENOL A ...
biochemist's user avatar
-3 votes
1 answer
71 views

Acetone resistant elastomer

I am in search of an elastomer that can be dissolved in solution and applied and cured at room temperature, but that has good chemical stability to acetone once cured. Does any such elastomer exist?
pmal's user avatar
  • 95
3 votes
0 answers
41 views

How do polyurethane varnishes cure after only the solvent evaporates

How do polyurethane varnishes cure after only the solvent evaporates? I believe that polyurethane varnishes have as components isocyanates & polyols that react to form the polyurethane portion of ...
Tempus Nomen's user avatar
3 votes
1 answer
189 views

How can I compare the UV/Vis absorption difference after metal ion chelating of crown ether-containing polymer?

Recently I have synthesized the polymer that contains 1-aza-18-crown-6 in the repeating unit. I want to know if there is any UV/Vis absorption difference after the chelation of metal ion. Considered ...
Krang Lee's user avatar
  • 1,081
0 votes
1 answer
55 views

Effect of changing of the concentration of reactants when concentration of the initiator and the concentration of the initial reactant are very small

A + I---> p What happens to the rate of the reaction when the concentration of the reactant is changed in a system that its concentration of its initiator and the concentration of the initial ...
Kavindu Lochana's user avatar
2 votes
1 answer
47 views

Would a "chain" of ring polymers be possible?

Basically what the title asks. By a "chain", I mean a structure where you have two or more ring polymers (polymers where the ends are joined to form a large circular/ring-shaped molecule; ...
Radvylf Programs's user avatar
5 votes
0 answers
77 views

Oxygen tolerant RAFT polymerization using AIBN?

I want to do some RAFT polymerizations but don't have a nitrogen line at the moment. It seems that people have recently implemented oxygen scavenging strategies to enable open-air RAFT polymerization. ...
toodles's user avatar
  • 137
2 votes
1 answer
38 views

Derivation of Flory's Model for Linear Condensation of Polymers

I'm having some trouble understanding a part of Flory's model for linear polycondensation reactions. In his 1936 paper, he derives an expression for the probability of the existence of a particular $x$...
Justus's user avatar
  • 21
0 votes
0 answers
48 views

What two processes occur that dictate the microstructure of a polymer?

Firstly, I'm not 100% sure on what a microstructure is as our lecturer didn't explain it all too well. From what I've gathered, its the backbone structure of the polymer chain - but I may be wrong. In ...
Audrix's user avatar
  • 137
-1 votes
1 answer
37 views

Why can i not use glue (which contains cyklohexane, petrol and ethyl acetate) for gluing PVC materials? [closed]

The manufacturer do not recommend using glue to gluing PVC. But Why? Thank you for your help.
Kiki's user avatar
  • 1
0 votes
0 answers
56 views

Is there any literature regarding the neutral hydrolysis of nylon 66?

I am working on a project for my thesis regarding the neutral hydrolysis of nylon 66 at high temperatures and pressures (265C,40 bar) however the only literature I could find relates to alkaline and ...
Andy's user avatar
  • 21
3 votes
1 answer
54 views

Will ethyl 2-amino-1H-imidazole-5-carboxylate undergo ester aminlysos with the primary amines of bPEI efficiently in methanol?

I was about to set up the following reaction, but before I do, I wanted to see if anyone has some suggestions or thinks this will not work: 24mmol Nboc protected ethyl 2-amino-1H-imidazole-5-...
toodles's user avatar
  • 137
-2 votes
1 answer
72 views

Could you tell me the name of this compound please? [closed]

Could you please tell me make of this compound?
soolbi's user avatar
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0 votes
0 answers
104 views

At the atomic or molecular level, why are some macroscopic materials more flexible, compared to others?

Before answering this question, keep in mind that I am a 2 year Biology student, with limited experience in studying chemistry. I am going to make assumptions which I explain, feel free to correct ...
Growing6884's user avatar
1 vote
0 answers
689 views

How does the branched structure of glycogen, increase its ability to be hydrolysed?

"Glycogen branching is essential because it allows for increased water solubility and several sites to break it down; this allows for easy and quick glycogen utilization when it is broken down&...
Growing6884's user avatar
1 vote
0 answers
46 views

Cause and Prevention of Palladium Mirror in Stille Coupling

I am conducting some monomer and polymer syntheses using Stille coupling or other palladium-based coupling. I usually use the combination of $\ce{Pd_2(dba)_3}$ and $\ce{P(o-tol)_3}$ in Stille coupling,...
Krang Lee's user avatar
  • 1,081
3 votes
0 answers
37 views

Why are certain hot polycarbonate films stickier than others? Molecular weight? Hydrolysis?

In van der waals dry transfer, we pick up flakes of materials such as graphene using polymer films. The material is exfoliated onto an SiO2 covered wafer and picked off using the polymer film. It's ...
Evan's user avatar
  • 131
-2 votes
1 answer
957 views

Do NaHCO3 and cyanoacrylate react? [closed]

I just saw this video about using baking soda + cyanoacrylate(CA) glue as a substrate+resin. Neat, but do CA and $\ce{NaHCO3}$ react in any way? If so, what does the equation look like and what is ...
KJ7LNW's user avatar
  • 165
4 votes
0 answers
110 views

How to estimate the mobility constant and the surface energy parameter in the Cahn-Hilliard equation?

As a mathematician, I want to simulate phase separations with the Cahn-Hilliard equation $$ \frac{\partial c}{\partial t} = M \Delta \bigg(\frac{\partial \mu}{\partial c} - \kappa \Delta c \bigg), $$ ...
Henning's user avatar
  • 193
2 votes
1 answer
105 views

Detecting epoxy in a polyester powder coat paint

I have 2 steel parts which were both powder coated in a polyester powder coat, however one of them does not perform exactly as I would expect it in my unusual use case which depends on temperature. I ...
Sašo's user avatar
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