make rheopectic slime in less than 15 minutes! (it is not oobleck) - cross linked polymer

by:Demi     2019-09-03
make rheopectic slime in less than 15 minutes! (it is not oobleck)  -  cross linked polymer
Welcome to my easy mud-
Make structure.
Update: I added a semi-transparent and more sticky version. Check it out.
First of all, I would like to thank JustAnotherDave for his help, who has done a great job in editing this manual.
Thank you very much :)
I will show you how to make yourself higherquality slime (
This mucus is not Oobleck;
Not made of starch)
Less than 15 minutes (
Time starts once you collect the material).
Of course, you will learn about two topics related to the structure and behavior of slime molds: Polymer and non-polymer
Newton fluid.
Continue to read and understand the meaning of "re-Crystal.
Let's do the mucus first, and then I will explain the scientific principles behind the mucus.
This project is very safe.
However, it involves the use of borax, which causes irritation to the skin and eyes, so do not touch it, and of course do not eat it.
It's poisonous to eat!
After completing the project, wash your hands very well and don't use any more spoons and flasks you use for food in this experiment.
The resulting mucus is also safe for children over the age of 5, but not suitable for consumption (
Imagine the effect of a very sticky polymer on any stomach! ).
If you are accidentally eaten, look for medical help immediately!
I suggest you look at the children while they are playing to avoid accidents.
If you or your child are allergic to anything, use gloves to manipulate mucus anyway.
I am not responsible for any damage or accidents caused by manufacturing or playing with mucus.
To make mucus, you need the following materials.
Cheap materials;
You should be able to get everything for less than $15.
Month spoons2 crystal thin neck boraxditailled waterGouache paint (
If you want to make translucent mucus, use the food pigment)
Mucus: this is the soul of mucus.
It's common and cheap in Mexico, but it's hard to find in other countries. Amazon.
Com carries an amber mucus that currently costs less than $2 for 3 ounces.
Mine is colorless, but I think Amber is OK too.
If you can't find it, you can use white glue, but the result is different.
I have tried the white glue and you can get a good mucus, but it is very different from what you get with mucus.
In order to make translucent mucus, you must use it.
It is very important: Do not use silicone glue.
They are toxic because they contain solvents.
They are also flammable and do not dissolve in water.
You can get a very confusing, sticky polymer from it, but I don't recommend this method.
The solvent smoke is very strong and the result is very poor.
If you want to try, take a chance in the well.
Ventilation area, do not give the child this mucus. It is not safe.
Now that you have collected the material, let's make the mucus!
Pour about 100 to 150 ml of distilled water into the flask.
Add a spoonful of borax and stir well until all of it is dissolved.
Now you should have a clear solution. Be patient.
It takes time for borax to dissolve.
If it doesn't dissolve completely, add some more water.
Now that you have a solution, move on to the next step.
It's really easy to do.
Pour some mucus in the flask.
The quantity depends on the amount of mucus you want to make.
I suggest you start with a small amount.
Once you have mastered the technology, you can make more mucus if you want.
Add water equal to the amount of mucus.
Our goal is 50% solution of mucus.
Now add a few drops of gouache and stir well until the mix is even.
Is this mucus the same as Oobleck?
The answer is No.
Oobleck is very different from this mucus. Both are non-
Newton fluid with certain properties but not all.
The chemical and structural reasons for their behavior are different.
The difference is that, first of all, Oobleck is a simple colloidal dispersion of starch in water.
It's a cross.
A connecting polymer made of another polymer, Poly-ethylene.
Second: starch is a natural polymer that exists in plants-sugar body.
Polyvinyl acetate was obtained by chemical synthesis.
It is a synthetic polymer.
Third: you can explain its properties by referring to its chemical structure. (Refer to step 6)
Oobleck, however, is only a physical dispersion and therefore does not involve a chemical reaction.
I think its strange properties are due to a physical phenomenon called adsorption. (
Note: This is not the same as "absorption.
"Please see the glossary in the next step. )
I will try to explain how I came to this conclusion: I read a lot about Oobleck online.
99% of websites pay attention to their non-
Features of Newton, but no one is trying to explain the phenomenon that produced it.
I found this link (
This is Spanish; sorry)
Trying to explain the origin of Oobleck's behavior, but none of these theories satisfy me.
So I formed my own theory: first, I would explain something about the starch and its properties at different temperatures.
Commercial natural starch is formed from grains with low humidity.
Starch is not soluble in water in cold water, only a few water molecules are dispersed and adsorbed.
There is water at room temperature, and starch particles can absorb a little water, but in fact a very small amount.
To make the starch particles absorb moisture, you need to heat the water to at least 70 degrees Celsius (158 degrees F).
When starch particles begin to absorb water, they expand;
At this point you will get a clear and sticky starch solution.
At a higher temperature (90 C/194 F)
Starch particles eventually break and form a solution at 95 °c/203 F.
When the solution is cooled, the solution becomes very sticky until a soft gel is formed.
Knowing this, my conclusion is that the main phenomenon between water and starch particles at room temperature is adsorption.
Therefore, the behavior of Oobleck is due to adsorption.
I think that when Oobleck is a fluid, starch particles and water have a normal adsorption rate, and there is more space between starch particles.
But when you apply a shear force on it, the starch particles are forced to absorb more water.
The higher the shear force, the more water the starch particles absorb.
Because it is a true saturated dispersion and the particles are spherical, water is adsorbed on it with a large amount of surface area.
Most of the water is adsorbed;
Grains are piled together;
Oobleck becomes as strong as a rock.
But this adsorption is very unstable, so when the shear force stops, the starch particles will automatically discharge the adsorbed water, and after a few seconds, Oobleck will become liquid again.
The more you play with Oobleck, the more sticky it becomes, but it's still liquid.
I think this is because there will be slight water absorption at this temperature.
You are heating the Oobleck with your hands, so you are helping the grain to absorb a little moisture;
Water is combined with starch particles, so the solution becomes more viscous.
Fourth: there are other differences in practical applications: making Oobleck is a very dirty activity because it will make everything it touches a thin layer of white
The mucus is not so dirty and no longer sticky when it is finished.
You can pour it on the table, your skin, your clothes, your toys, etc.
, You can remove it easily.
Oobleck is starch.
If a child tries to eat it, it is less dangerous than a child trying to eat mucus.
I tried and tried but if you do a thick sticky ball it will bounce and my Oobleck will never bounce.
The physical form of Oobleck lasts only a few seconds.
For example, sticky bacteria flow slowly so you can use it for Halloween decorations with your creativity.
Oobleck is opaque.
The mucus is very shiny.
You can't change the texture of Oobleck.
You can control the synthesis of mucus, if you want, to make it thicker or thinner.
With the correct shear force, Oobleck can become as hard as a rock.
You can't do this with mucus.
The shelf life of Oobleck is shorter than mucus because it is more vulnerable to microbial attacks.
If you can protect your mucus well from air pollution, it will have a longer shelf life.
It seems to me that both fluids have interesting properties.
You should try both of them.
If you are interested in getting to know starchHere, I took a starch image from this technique, which is a short vocabulary of the terms used in the explanation :(
These definitions are, of course, very simple.
If you want to go deep, you will notice that it has become very complicated and there are many kinds of polymers and liquids)
Adsorption is a reversible process through which fluid molecules are fixed on solid substrates, usually on surfaces or porous materials, in other words, molecules are fixed only on solid surfaces.
Adsorption has many industrial applications, and the use of charcoal to absorb gases in gas masks is a good example of adsorption.
Absorption is the inhalation of a gas or liquid into a hole that can penetrate a solid, and an example of absorption is the formation of a solution in which the liquid spreads into a solid that forms a solution.
Borax: a borax salt that has many limiting reagents for industrial applications (
Or limit the reactants)
Is a substance completely consumed in a chemical reaction, which determines (or limits)
The number of products formed. Non -
Newton fluid: a fluid whose apparent viscosity changes when you apply shear force to them. .
Newton fluid has a constant viscosity under shear action.
Water is a Newton fluid;
Frozen cream is a nonNewton fluid.
Polymer: a polymer composed of many equal parts (
Like a link in a chain).
Its structure and nature depend on how the chain that forms it is arranged.
For example, it can be solid or liquid, transparent or opaque, etc.
The polymer surrounds us and is the foundation of our universal materials in the world.
Natural polymers such as cellulose, as well as synthetic polymers such as nylon and Teflon.
Polyvinyl acetate: a polypolymer: in short, it is the study of changes in the morphology and flow of materials.
For example, when you stir or pour water, the viscosity is related to the behavior of the water.
Flow Fluid: a non-Newton fluid whose apparent viscosity increases under shear action.
Contact fluid: a non-Newton fluid with reduced apparent viscosity under the action of shear force.
Viscosity: it is the resistance of the fluid to the flow.
For example, glycerin is more sticky than water.
This means that glycerin is more detrimental to flow than water.
There are a lot of books on polymers and fluids, here are some: Polymer Chemistry: Introduction to polymer and composite theology, understanding the fluid mechanics foundation of the second edition of theology (
Topics in chemical engineering)
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