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 bubbles and crystals found in sodium acetate hot packs after use and storage in the solid form?

When sodium acetate trihydrate hot packs are regenerated soon after activation, they regenerate to a clear liquid upon boiling (typically with an air bubble that was not present in the new pack) On ...
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13 views

How can I restore the surface of ABS polymer products?

Recently I asked a question about de-yellowing Lego. I have a follow-up question on this. I try to design a setup where I can de-yellow Lego and remove/obscure any scratches from the surface of Lego ...
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9 views

Why do polymers have higher coefficients of linear thermal expansion than metals?

What started out as a homework question is now bothering my brain. I have always known that metals expand pretty well when their temperatures increase. Also, I have never heard of polymers like Teflon ...
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15 views

Synthesis of Polyvinylidene fluoride (PVDF)

I would like to know what the easiest way of synthesising PVDF is, or is it easier to buy the polymer online, and could PVDF be made transparent. Thanks
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12 views

Hair Gel Derivative

I need a water-soluble, extremely fast drying adhesive gel. My first thought is hair gel. pros: Water Soluble (easily removed)*** most important High viscosity in liquid form ~60 cps Easily ...
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11 views

What polymer can plug the leak internally?

Like they said in the web site http://www.pipefuze.com/how-pipefuze-works/, I wonder what kind of polymers can do the works in part A and B? Part A – Polymer & Filler – The polymer and filler is ...
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15 views

Speed up polymerisation of formaldehyde

Is there a way to speed up the formation of para-formaldehyde in a formalin solution?
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41 views

Investigating the displacement of a Se anion by a Sulphide anion

I am working with CdSe Quantum Dots suspended in hexane. I then tested the photoluminescence of my solution. Then I mixed my CdSe dots with a mixture of an organic conducting polymer which was ...
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1answer
45 views

How do I determine which liquids are immiscible with one another?

I am trying to work out which type of ferrofluid I can use to form a weak magnetic seal for a container of liquid photopolymer resin. Is there a mathematical approach to determine what substances will ...
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31 views

Why plastic sheets contract when heated?

Why do thin plastic sheets contract when heated, contradictory to the behavior of most other materials ? What are the things going on at the molecular level ?
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19 views

Estimate inflammability of ABS?

I am studying some electrical components and particularly Raspberry Pi 2 official cases. Their manufacturer says that they consists of ABS (Acrylonitrile butadiene styrene) when I ask if their ...
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37 views

What are the dangers of melting HDPE and silicone? Is it even possible?

I've searched the internet and couldn't find a specific answer. There doesn't seem to be a single recycling company that takes empty silicone tubes (also know as mastic tubes) and recycles them. As a ...
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22 views

Curing of polyester resin that did not reach top exothermic temperature

When working with polyester resins for fiberglass or geloat, there are times where the thickness of the resin on the substrate is not sufficient to get a strong exothermic reaction and achieving a ...
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36 views

Do polycarbonate and/or polyurethane have latex?

I have a severe latex allergy which hinders my health every day via hives, inflammation, and breathing trouble. I am trying to find a cell phone that is not going to cause anaphylaxis or other ...
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1answer
79 views

Is there an easy way to make PVC from PVA?

Say, I took Elmer's glue (or a similar Polyvinyl Acetate) and I inserted some Chlorine Tabs and warm it up while stirring. Would the electronegative Chlorine turn some of it it into Polyvinyl ...
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47 views

What's the difference between “conversion” in condensation polymerization and in radical polymerization?

The conversion in condensation polymerization is defined as the fraction of functional groups reacted, $$p=\frac{[M]_0-M}{[M]_0}$$ while in radical polymerization it's defined as the fraction of ...
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86 views

Interaction between energy and entropy in highly elastic polymers?

Consider the interaction of energy and entropy in the highly elastic materials of an ideal polymeric network. Now Gibb's free energy cannot be used directly $\Delta H = \Delta G + T \Delta S$ where ...
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2answers
109 views

What elastic polymeric material look like at molecular level?

I think there are few crosslinks in elastic material. So probably, the material would look like not so dense, maybe even transparent. I received this question from my collegue and have difficulty in ...
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1answer
29 views

Is there a way to liquefy a super absorbent polymer without using salt?

I understand that once a SAP absorbs a liquid it becomes a type of gel and that this gel can be liquefied by applying salt, are there other methods to liquefy this gel without using salt?
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Effects of long term mineral oil saturation acrylic monomer coating

I used a folded in-half band-aid (sticky sides inward) as a buffer between my finger and the textured touchpad on my laptop, but I also had to apply mineral oil or baby oil to the touchpad so that the ...
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44 views

It is easier to iron cotton clothes when slightly wet, why?

As the title says, why is it easier to iron cotton clothes when slightly damp ? Has this got something to do with the hydrogen bonding in cotton ?
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130 views

Does chemical compound with formula N4O10 exist?

I do not know if a dimer of N2O5 (dinitrogen pentaoxide) exist, and if its formula is N4O10. Can you explain me that please? I do not know where to search for this information.
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1answer
75 views

At what temperature do complex hydrocarbons become ashes?

When heating a metal tube with polypropelene in it, i found that i still had brittle black foam and flakes in it even though it had been in a blue flame at around 500'C What happens to complex ...
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Why is vulcanization called “vulcanization”?

I know it might sound a dumb question but whenever I come across a note on importance of vulcanization I get stuck as to the meaning of the term and why it was adopted.
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20 views

Preparing polyurethane with IPDI (Isophorone Diisocyanate)

I am trying to prepare a polyurethane using hydroxy-terminated polybutadiene (a polyol) and IPDI (a diisocyanate) as the curing agent. I intend to use DBTDL as a catalyst. I read that both IPDI and ...
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37 views

Why the backbone of polylactic acid's repeating unit contains only one oxygen?

The monomer unit of polylactic acid is $\ce{CH_3-CH(OH)-CO_2H}$: So why the backbone of the repeating unit is $\ce{-C-C-O -}$: and not $\ce{-O-C-C-O -}$?
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49 views

Why does latex tubing become white and brittle over time, especially where it's bent?

Here's a picture of some latex tubing we have in the lab, bought many years ago and stored in a drawer. What's responsible for the white corners near places where the tubing is bent? Is this ...
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26 views

Polycarbonate resistant to chemical

Why polycarbonate couldn't stand some chemicals i.e. acid and base? What reaction will occur if polycarbonate meets acid or base?
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26 views

What is an example of a biodegradable polyethylene?

I would like an example of a Biodegradable Polyethylene. I am using polylactic acid (PLA) as an example of a biopolymer/ bioplastic but I can not find a biodegradable polyethylene, that is a ...
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1answer
37 views

Why are tertiary carbon atoms of polymers more prone to photo-oxidation and -degradation?

In Polymer Chemistry by Seymour-Carraher: Saturated linear polymers such as HDPE are resistant to degradation, but slow degradation will occur in presence of $\ce{O2}$, UV, heat. Since tertiary ...
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25 views

How do polymer properties change when moving from bulk to nanosized fibers?

Polymer are used in many applications, but how do the properties change when they are fabricated on the nanolevel? Im especially interested in polymeric and polymer derived nanofibers, and why they ...
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2answers
157 views

flory ( or theta) temperature

I know the flory temperature is the unique temperature at which the attractions and repulsions of a polymer in a solution cancel each other. but what does this mean in practice? does it mean that ...
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28 views

interpenetrating polymer network (IPN)

I just learend about an interpenetrating polymer network (IPN) and that this is a way of mixing polymers. But I thought it was thermodynamically impossible to mix 2 polymers because in ∆G= ∆H -T.∆S ...
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26 views

What is the correct way to draw the end groups of polylactic acid?

I came across two different ways to draw the end groups of polylactic acid: (source) AND: (source) Which one is the correct way?
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Formation of polymers - addition polymerisation

In addition polymerisation, a double bond in the monomer is broken and a long chain of polymers is formed. How is this bond broken (where is the energy input) and how is the long chain formed? ...
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28 views

Removal of water in condensation polymerisation

In the process of condensation polymerisation, a water molecule is removed (H and OH) to allow the two reactant functional groups to combine, forming a new compound. (eg. Esterification: alcohol + ...
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16 views

What is the reaction between Cyanoacrylates and Cotton?

Basically, if you combine a cyanoacrylate (aka. super glue) with cotton, an exothermic reaction will occur. What i would like to know, is 1) what the formula describing the reaction, and 2) why the ...
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77 views

Does freezing tights make them more durable?

Various blog posts and articles suggest that freezing a pair of tights will make them last longer. From a blog named Eclipsed Moon: Put your tights in the freezer. I thought that this was ...
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16 views

Non-newtonian Fluid separation

Recently I've been wanting to use a fluid with non-newtonian properties and I chose to start off with the cornstarch and water mix. After hunting around how long this mix lasts without separation/mold ...
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8 views

What are the steps involved in deformulation of a polymeric emulsion?

I want to reformulate acrylic emulsion that is used for painting. I went to Analytical Chemistry page of wikipedia to learn how it is done,but don't know which method will work for emulsion. I have ...
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How high is the variance of the shore D hardness for a synthetical resin?

I realize that the variance of hardness depends on the homogenity of the polymer throughtout a specific sample, the polymer itself and on the measurement, but maybe there are typical values. To be a ...
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266 views

Is graphene a polymer?

A polymer is sometimes defined as a macromolecule with MW larger than 1000 g/mol. So can graphene be considered a polymer?
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40 views

What are the volumetric thermal expansion coefficients for butyl acrylate and methyl methacrylate monomers?

We have some tanks of butyl acrylate and methyl methacrylate monomers, and the level indicators are giving incorrect readings. The control systems engineer who set up that system suspects that the ...
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28 views

What is the appropriate sizing for fiberglass compatible with polyamide?

I am looking for a chemical coating for glass A fibers, compatible with polyamide. The fibers are uncoated, 100-filament strands of 22-micrometer "A" glass fibers. We are producing fiberglass in our ...
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1answer
52 views

Can you fix rubber on a handle after it has all but turned into a liquid?

I picked up a splitting maul at a yard sale last year. I used it for the rest of the season with no problems. It has been in the wood shed and exposed to some sun, but mostly shade. I picked it up ...
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1answer
70 views

Do polymerized cooking oils release free radicals

I am seasoning a carbon steel wok and from what I understand it basically involves heating cooking oil on it until it gets to the smoke point and then forms a polymerized layer that makes it like a ...
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1answer
54 views

Good software to perform simulations on polymer (absorption spectra)? [closed]

Sorry guys,I'm totally new in this field,for personal interest I'd like to start some calculations on conducting polymers ,could someone suggest a good software to perform simulations on polymer ...
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27 views

What are the links of Thermoplastic polymer material?

The title says everything, but what are the links between chains of monomer of thermoplastic polymer material? Is there a specific link between atoms that I'm not aware of or is there some invisible ...
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1answer
109 views

Is so called “Polymerized LiNb (Lithium Niobocene)” a possible compound?

The so called "Polymerized LiNb (Lithium Niobocene)" is a fictional compound. I heard about this substance being used for an interesting purpose. It reacts to mechanical stress or pressure by ...
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108 views

Mechanism and type of polymerization of chloroethene

Ethene reacts with hydrogen chloride to form a monomer used in the production of a polymer. This monomer is chloroethene. My questions are: (1) How is the polymer formed from the monomer? and (2) ...