A polymer is a large molecule, or macromolecule, composed of many repeated subunits. Because of their broad range of properties, both synthetic and natural polymers play an essential and ubiquitous role in everyday life.Polymers, both natural and synthetic, are created via polymerization of many ...

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What are the units of 85000 Molecular Weight of a polymer

I have a PVA bottle, which says that the molecular weight (Mw) of PVA is between 85000 - 124000. I know that this means that there are repeated chains of the PVA monomer, but what are the units to ...
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3answers
4k views

Is there ANY chemical that can destroy PTFE, or Teflon?

Polytetrafluoroethylene was discovered by accident. It now is an important material in the industry mainly because of its extremely high bonding energy, which prevents corrosion, halts reaction, and ...
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15 views

Chemical incompatibility between aluminum hydroxide [Al(OH)3] and carbomer polymer [-CH2-CH] N-COOH]

I am currently adsorbing proteins to an aluminum hydroxide gel. By adding a carbomer (polymer of acrylic acid cross-linked with allyl sucrose), I achieve a somewhat synergistic formulation. Shortly ...
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0answers
6 views

Would polyamide 6 filaments be effected by an acrylic micro emulsion?

I would like to hear more about: Will an acrylic micro emulsion applied to polyamide 6 filaments (that have been coated with PTFE) weaken the filaments? Also would polyester filaments be effected?
3
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1answer
30 views

Electroplating metal inside polymer foam with acetone

In my research we have a method of making polymer open-cell foams with high tortuosity and pore sizes on the order of 50–200 nanometers. I can make thicknesses of 100 µm to 2 mm thick (and up to 5 ...
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1answer
39 views

What determines the elastic limit of a substance?

from what I know, the elastic limit of a substance is the maximum amount of stress/force/pressure (a bit of confusion on my behalf here) a substance can withstand and still return to its original ...
3
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0answers
21 views

PTFE (Teflon) combined with Silicon Polymers

I wanted to know if it would be possible to combine basic silicon polymers with PTFE in order to create a stable, non reactive silicon rubber that won't react to butane or other hydrocarbons in ...
3
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0answers
30 views

Ziegler-Natta polymerization regioselectivity

Why does the Ziegler-Natta polymerization display the regioselectivity shown in the image? Internal (coordinated to the metal) nucleophiles should attack the alkene on the less substituted end like in ...
3
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1answer
53 views

Electrochromic Materials, electrode setup

I've read a lot about electrochromism. This article on electrochromic materials has also been additionally helpful. I was wondering, for these electrochromic materials, can you simply attach a small ...
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2answers
129 views

Why starch (amylose) and cotton (cellulose) are so different?

Both amylose and cellulose have the same "monomer" structure (glucose), so what makes them look/form so differently?
3
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1answer
50 views

How does the catalyst in a polyester resin or epoxy work?

I would like to understand how the polyester resin or epoxy catalyst works and to what degree it must be mixed with the base material in order to be effective. Typical product instructions advise to ...
8
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1answer
76 views

deltaS of a decomposition reaction

Suppose we had the following reaction: $$\ce{Polymer ($n$~units)_{(aq)} -> Polymer($a$~units)_{(aq)} + Polymer($n-a$~ units)_{(aq)}}$$ Without knowing the specific monomer unit of the polymer, ...
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45 views

How to dissolve a strong resin in difficult situation?

The resin is made up from two components: Component A: silicic acid, sodium salt (less than 10% sodium silicate) Component B: Diphenylmethane-4,4'-Diisocyanate, isomers and homologs ...
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3answers
53 views

Can Polyethylene Dissolve on 50-60 °C

I know that polyethylene's melting point is between 115–135 °C, however I would like to know if can it start dissolving between 50-60 °C? In a real example, if I put warm food (straight from the ...
12
votes
1answer
167 views

What happens if a polymer's length is equal to its persistence length?

So, I've been looking into polymer chemistry to model breaking polymers for a biological model, and I've been a bit stumped by the concept of persistence length. I know that if a polymer is ...
3
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1answer
29 views

Softeners in synthetic materials?

Are there softeners used in polyester or polypropylene to make these materials more flexible? Or is this not needed for this kind of synthesis?
3
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1answer
39 views

Polyurethane epoxy resin chemistry advice please?

My friend can buy polyurethane epoxy from his workplace for 3 dollars a litre, except that he doesn't know precisely the data sheet for it. His factory gets it in 20 ton deliveries. He says that the ...
2
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0answers
22 views

How to distinguish open-pored polymer foam and foam with closed pores?

I was looking at two foam materials, where I had expected one to have closed pores. Unfourtunately, the microscope was showing the upper layer of cut cells the same in both cases with no indication ...
2
votes
2answers
71 views

PMMA cross-link temperature

I premise, I’m a physicist and I’m working on a transfer procedure for graphene via CVD, which involves the use of PMMA as a resist layer. Studying this polymer, I still haven’t found what is the ...
6
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0answers
43 views

Adding a polyvinyl alcohol chain onto polyethylene [closed]

For school, my teacher asked what the proper procedure/reaction would be to add a polyvinyl alcohol chain onto a polyethylene chain. Can anyone help? I'll provide additional information if needed.
3
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1answer
51 views

Possible Synthesis of a Polymer

Following a question I have asked previously, what I intend to inquire this time is quite similar as well, except, with a polymer. So previously I asked whether such monomer PCDO is possible to ...
12
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2answers
431 views

Ripping apart a polymer - reaction or not?

I was holding a piece of plastic earlier, and I ripped it in half. This caused me to start to think about what was happening at the atomic level. If the plastic is being ripped, clearly bonds are ...
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0answers
26 views

How to make polyester casting resin?

What are the components of and how would one go about making polyester casting resin?
6
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2answers
115 views

How many molecules are there typically in items made of plastics?

In objects made of plastic (and other polymers), how many molecules would one generally expect to find? Intuitively, it seems like, say, a plastic shopping bag or PET bottle couldn't be a single ...
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0answers
70 views

Which polymers are healthier for contact lenses? Ionic or non ionic?

As a contact lenses user, I was looking for information about which polymers are more healthy for contact lenses. Ionic or non-ionic? It's very hard to find credible and non-biased info about contact ...
5
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2answers
309 views

Why does alcohol crack acrylic (plexiglass)?

I have seen videos and discussions about alcohol cracking acrylic, and waterblock manufacturers reminding users to not use alcohol in cooling system with plexiglass acrylic, but why is it so? That ...
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10 views

ordering the hydrophilicity of some polymers

I need to compare the hydrophilicity of those materials to compare contact angles of water with those materials' surfaces for surface tension measurement. Materials are: PTFE (Teflon), PVC, PS, PVDF, ...
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27 views

Lightweight alternative to PVC that can include a UV-resistant polymer?

For a project of mine I need some rigid or semi-rigid tubing for a non-structural use. A friend of mine suggested that it would be easiest to buy standard PVC pipes but it is very expensive where I ...
2
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1answer
32 views

Thermal decomposition products of polyurea?

Are the thermal decomposition products of polyurea polymers known, especially of the urea group, in the absence of water? Looking at the formula ...
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0answers
17 views

transparent plate that hardened resin won't stick to

What kind of materials are there available that will be transparent (at least 80% light should pass through) for 365 nm UV that would not stick to hardened resin? I am building a 3D printer that ...
11
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1answer
120 views

How does epoxy stick to stuff?

According to Wikipedia what gives epoxy its holding power is apparently "ionic" interactions between the epoxy and the surface. But I thought that epoxy was overall neutral when cured. How can it ...
0
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1answer
137 views

How to identify the repeating unit in a polymer?

Polyvinyl acetate, PVA, is a useful adhesive for gluing together articles made from wood, paper or cardboard. The monomer of PVA is ethenyl ethanoate. PVA is formed from B by the process of ...
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0answers
18 views

Could someone explain the phenomenon of Dynamic heat capacity and fictive temperature for thermoplastics?

Could someone explain the phenomenon of Dynamic heat capacity and fictive temperature for thermoplastics in polymers?
4
votes
1answer
111 views

How to take water-dispersed PEDOT:PSS and disperse it in an organic solvent?

I am doing a science fair project on OLEDs. I am testing whether polypyrrole can be used as an emissive layer in a 2-layer OLED. The polypyrrole I am synthesizing is water soluble, and will be ...
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1answer
205 views

What Can Dissolve Polypyrrole?

I am looking for a solvent for polypyrrole. I read M-cresol and chloroform can be used, but I am not entirely sure.
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2answers
64 views

What is the relationship between the molecular weight of a polymer and that of polystyrene?

So, I read in a similar chemistry thread that you can get Mn and Mw of the polymer of the interest by comparing the result of the sample obtained from GPC/SEC with the standard known molecule weight ...
3
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0answers
66 views

UV curable adhesive

I'm looking for a UV curable adhesive that can be removed without peeling or burning. Ideal removal would be some kind of solvent over a relatively short period of time. I also need it to have a ...
5
votes
1answer
143 views

Are there different types of melamine resin?

Background I have a little knowledge of chemistry. I was talking to a sales rep from a cleaning supplies company. They sell a scrub sponge that looks and functions just like Mr. Clean Magic Eraser. ...
0
votes
1answer
86 views

TPE fabric vs PVC fabrics?

I am currently in charge of purchacing fabrics from asia. My personal policy is to try and stay as enviromentally freindly as possible. Your answer to the following question would be of great help and ...
3
votes
1answer
56 views

How is the process of creating PVC fabrics harmful for the environment?

I often hear that the production process for PVC fabrics (such as those used in Gucci and Versace handbags) is very harmful to the environment. What part of the process is harmful and can this be ...
0
votes
1answer
72 views

Can I change glass transition temperature (Tg) and impact resistance with additives?

I have three different HDPE polymers with different melting index but they don't have any elasticity. Physical form of polymers is granules. Can I change glass transition temperature (Tg) and impact ...
4
votes
3answers
189 views

Can you have addition polymerisation with monomers other than alkenes?

Every example of addition polymerisation I have seen so far has used alkenes as the monomers. I was wondering if it is possible to have some other molecule. I don't think the following molecule can ...
0
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2answers
213 views

Difference between polypeptides and polyamides

I can't seem to find a very good explanation of the difference between polypeptides and polyamides. So far, I know that polypeptides are a type of polyamides, but that is about it. My guess is that ...
4
votes
2answers
405 views

How do epoxys cross-link?

What's the mechanism of cross-linkage for a typical household 2-party epoxy mix? I was working with some epoxy the other day and I was instructed to mix equal parts of epoxy and epoxy hardener. ...
4
votes
3answers
112 views

Can a single monomer be a macromolecule? If so, when?

In our science class, we're learning about the four fundamental macromolecules in every living organism: carbohydrates, proteins, lipids, and nucleic acids. Our class definition of a macromolecule ...
2
votes
2answers
74 views

Same monomers, different water content?

We're currently studying "the chemistry of contact lenses", which is mostly polymers and gels. I just looked at the package of two pure hydrogel lenses made out of the same monomers, but they have ...
2
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0answers
75 views

Maximum coefficient of friction between nylon and polyethylene

For a research project I found out last minute that I need the coefficient of friction between nylon and Ultra-high-molecular-weight polyethylene. After hours of scouring google nothing useful turned ...
1
vote
1answer
22 views

Abundant substances which I may use like coupling agents

What is the most abundant substances which I may use like coupling agent for Wood plastic composite with HDPE polymer? I don't want maleated polyolefin because they are not so abundant in my country.
5
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1answer
47 views

Can I break starch down into glucose units?

I was wondering if starch can be broken up into individual glucose units. Because on a site I saw, it said that through acid hydrolysis starch can be broken up into amylose and amylopectin. However, ...
0
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1answer
68 views

Chemicals in a Rubber Compound - NSR 20, Accel CS, Accel DPG, Anitiox Q, Antioz PMB

I have a recipe for a rubber compound and am trying to understand some of the ingredients. The ones I do not recognize are Compound A NSR 20 Accel CS Accel DPG Anitiox Q Antioz PMB Compound ...