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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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 ...
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1answer
24 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 ...
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40 views

Adding a polyvinyl alcohol chain onto polyethylene

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.
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1answer
47 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 ...
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2answers
414 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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23 views

How to make polyester casting resin?

What are the components of and how would one go about making polyester casting resin?
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86 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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44 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 ...
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2answers
129 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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9 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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14 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 ...
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1answer
26 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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15 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 ...
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1answer
104 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 ...
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1answer
108 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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17 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?
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1answer
62 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
116 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
45 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 ...
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63 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 ...
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1answer
89 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. ...
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1answer
66 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 ...
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1answer
50 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 ...
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1answer
61 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 ...
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168 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 ...
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110 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 ...
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2answers
287 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. ...
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3answers
94 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 ...
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2answers
63 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 ...
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56 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 ...
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1answer
20 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.
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25 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, ...
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1answer
58 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 ...
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1answer
45 views

Can I change viscosity of an HDPE polymer?

I want to make composite with HDPE and wood, but when I melt it I have problem to mix them, because this polymer have high viscosity.
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1answer
41 views

What makes something biodegradable?

Learning about biodegradable polymers and non-biodegradable polymers. What exactly sets them apart though? Here's the formula from wikipedia for the biodegradable PHB: and here for polypropylene, ...
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71 views

Fire resistance of PVC

In a paper that I'm reading, it states that The presence of Chlorine atoms in polyvinyl chloride make it flame resistant and I'm just wondering why the presence of Cl will make it flame ...
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1answer
12 views

Fermentation in the presence of UV light

Does the presence of UV light, or any radiation for that matter, affect the process of fermentation? I'm not sure, but I seem to recall somebody telling me before that yeast will not function ...
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1answer
39 views

How do I achieve same crystallinity when cooling polymers?

I am trying to make "films" of polyethylene glycol by melting them, pouring them into a mold and then cooling the mold down. The plan is to do this with different molecular weights. The problem is ...
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1answer
106 views

Enclathrated - definition?

When discussing the solvent uptake of a metal-organic framework would the correct term be "solvent molecules were enclathrated into the pores"? Despite searching for a definition online I have drawn a ...
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58 views

Resin for making Jewelry

I want to make resin jewelry, but I'm having problems! I want to create that effect, but I do not know what materials to use The result is a mix of resin and other such things
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32 views

Struggling on how to draw monomers

Can someone systematically show me how to work out this question? I don't really understand the process. The answer follows: I know the double bond turns into a single bond, and it seems that ...
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1answer
506 views

What is the difference between polyethene and polyethane?

The monomer in polyethene seems to drop the $\ce{C=C}$ bond and end up with a $\ce{C-C}$ bond. The polymer chain then looks like $\ce{[CH2-CH2]_{n}}$. If I were to look at that polymer chain I would ...
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1answer
373 views

What is the exothermic reaction of superglue with cardboard?

I glued a sheet of paper to a cardboard package using superglue. To my surprise the paper became very warm. What kind of reaction is it? (The glue in question is labelled with Ethyl ...
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1answer
51 views

Residual stress in polymer coatings

A paper talks about the residual stress when coating polymers. It says that residual stress is the sum of the "heat stress" (due to the difference in thermal expansion coefficients) and the "shrinkage ...
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1answer
50 views

What are some of the canonical texts for polymers? Is materials science more related to polymers than chemical engineering?

I am a freshman in college. My major is chemical engineering. I would like some recommendations for a textbook that's an introduction to polymers. I am wondering whether a major in materials science ...
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2answers
168 views

Why no thermal expansion for camping tents?

I know that solid materials expand when heated, which is called thermal expansion. But what is happening to tent square or tent canvas of (plastic?) camping tents? I have noticed, that during the ...
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1answer
106 views

Ethyl alcohols use on polycarbonate and acrylics

I have an interesting question about the use of ethyl alcohol on polycarbonate windshields. I have had friends asking me about the use of Pledge Multi-Surface cleaner on their windshields. Some ...
3
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1answer
54 views

What is an effective fabric-friendly solvent for aluminium chlorohydrate?

I have recently found out that the white/yellowish "sweat" stains one occasionally finds on t-shirts might be aluminium chlorohydrate polymers. While talk about aluminium and antiperspirants is all ...
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1answer
763 views

What makes teflon such a strong material?

I don't know much about polymers but recently teflon made me get addicted to study their properties and nature. As far as I know, the teflon polymer contains fluorine which is one of the most ...
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30 views

Polymer Crystallinity

See the following question: I think the answer is A because of the hydrogen bond in the side group, thus the degree of secondary bonding between parallel chain segments is higher. Is my thinking ...