A large molecule (macromolecule) composed of repeating structural units.

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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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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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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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39 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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19 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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3answers
99 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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2answers
24 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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90 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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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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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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16 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
19 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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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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39 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
29 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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32 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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53 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
10 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 ...
3
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1answer
30 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
62 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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55 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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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
305 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
292 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
47 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
43 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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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
69 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
46 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
641 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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20 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 ...
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46 views

Monomers and polymers

At Wikipedia a monomer is defined to be a molecule that may bind chemically to other molecules to form a polymer. A polymer is defined to be a molecule composed of many monomers. These ...
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What is the chemical composition of VOC's off-gassed from polyurethane?

I understand that all polyurethane (PU) materials off gas VOCs. I tried finding the % composition of the gases off-gassed by PU, but I am not able to get satisfactory answer. On the same note, why are ...
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Modelling planar ring molecules and their evolutions

This is the next step of my previous question. I am trying to simulate a circular chain (ring) of molecules which are planar (two dimensional). What I do is take a planar unknot and embed it into a ...
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33 views

Modelling planar molecules and their evolutions

I am trying to simulate a chain of molecules which are planar. Can anyone please give me an example of the molecular chain which can stay as planar with it's minimum energy state is planar. A ...
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1answer
36 views

How do I lookup a polymer by its structure?

This is more of a meta-chemistry question, but, here goes... Given the structure of a polymer, how can I search online for which polymer it is? Specifically, I have an image like this: I'd also ...
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1answer
146 views

What are the physico-chemical processes at play in ironing of clothes?

The process of ironing of clothes removes (to a large extend) the wrinkles that where introduced in the clothes while drying. Obviously this has to be some physico-chemical process that is ...
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3answers
184 views

Safety concerns - Heating PMMA (acrylic glass) and fluorinated polymers

I have some plastic optical fiber, which consists of a thin core of PMMA (polymethyl methacrylate), covered by a fluorinated polymer. I would like to heat a bundle of these fibers to ~130 degrees, in ...
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Alginate nanoparticles

I want to produce alginate nanoparticles from NaAlg. I choosed nebulizing NaAlg solution into $\ce{CaCl2}$ solution but 2% (m/v) NaAlg solution is quite viscous. What should I do to make it inviscid? ...
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156 views

How much UV lamp power is needed to initiate radical polymerization?

I'm looking to purchase a UV lamp for initating some radical polymerizations. Is a hand lamp like the type for examining TLC plates (5-10W, like this) enough power to do this, or do I have to buy ...
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1answer
88 views

Does supersaturated caffeine polymerize?

I tried preparing a supersaturated solution of caffeine by mixing anhydrous caffeine powder with water in a thin Turkish tea glass and heating it up over a candle (desperate times...). This worked ...
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1answer
43 views

Polymers with no molecular mass distribution?

What sort of ideal conditions are required - theoretically - to conduct polymerization reactions to make all the macromolecules end up with exactly the same molecular mass, just like the products in ...
3
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1answer
72 views

How to synthesize t-Boc protected derivative of PVA

I've been toying with different potential recipes for DIY photoresist. My current favored design is a chemically amplified resist based on PVA (poly(vinyl alcohol)). For those who are unaware, a CAR ...
2
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2answers
185 views

What type of sensor technologies exist to determine the chemical composition of a polymer?

Let's say I have several pieces of trash and each is made with a different type of material like: Plastic bottle : High Density Polyethylene (HDPE) Cereal box : Paperboard & Epichlorohydrin ...
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1answer
286 views

How to liquefy or extract water from superabsorbent polymer

I am finding a good way to liquefy or extract water from superabsorbent polymer. From what I remember it was salt that can liquefy it. Since salt when dissolve will have sodium cation and there for ...
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48 views

What chemical properties make some grassses usable for producing textile fabrics?

Textile Fabrics are made out of cellulose fibres that can be derived from cotton or bamboo. As far as I know all grasses contain cellulose, so why are only a few grasses used? What makes them so ...
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291 views

A chemistry approach to environmentally friendly yoga mats… NBR, NR, TPE, PER [closed]

I'm currently seeking your expertise while creating a line of environmentally friendly yoga mats, and I apologize in advance if any chemistry knowledge of mine has been absent since college and I lack ...
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Molding/shaping sodium polyacrylate?

I've been researching sodium polyacrylate, which normally comes as those "aqua gems" for plants, or fake snow. Specifically, I've been hoping to find information on molding, casting, or otherwise ...
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What are Thermoplastic Elastomers (TPE) and what is their environmental impact [closed]

TPE is often touted as a more environmental alternative to PVC (at least for yoga mats). What are TPEs and what raw materials are they manufactured from. What uses and properties do they have? Are ...
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Electrical and Mechanical properties of Sodium Polyacrylate?

I was looking for a chart with electrical and mechanical properties of the Super Absorbent Polymer Sodium Polyacrylate(WaterLock) and could not find one. Please help.