How can we differentiate hydrophobic and hydrophilic polymers based on their chemical structure?
A lot of polar groups in polymer (-OH, =NH, =C=O, -C(O)OH, -CN, -C-O-C-, -C-N-C-, and so forth) - hydrophilic polymer.
A few polar groups in polymer - hydrophobic polymer.
A lot of polar groups in polymer (-OH, =NH, =C=O, -C(O)OH, -CN, -C-O-C-, -C-N-C-, and so forth) - hydrophilic polymer.
A few polar groups in polymer - hydrophobic polymer.
In addition to Elena Ladilina's answer, long chain alkyl groups increase the hydrophobicity in general
Kamilah,
From SigmaAldrich website you can find the answer to your question
"Hydrophilic polymers contain polar or charged functional groups, rendering them soluble in water. Most hydrophilic polymers are grouped by the chemistry of their structure. For example, acrylics include acrylic acid, acrylamide, and maleic anhydride polymers and copolymers. Amine-functional polymers include allylamine, ethyleneimine, oxazoline, and other polymers containing amine groups in their main- or side-chains."
Hydrophobic polymers are the opposite of that.
To view chemical structures of both types, please see
---http://www.sigmaaldrich.com/materials-science/material-science-products.html?TablePage=16372116
---http://www.sigmaaldrich.com/materials-science/material-science-products.html?TablePage=16372120
Good luck
A lot of polar groups in polymer (-OH, =NH, =C=O, -C(O)OH, -CN, -C-O-C-, -C-N-C-, and so forth) - hydrophilic polymer.
A few polar groups in polymer - hydrophobic polymer.
The containing of polar groups makes the polymer water soluble we can say that the polymer is hydrophilic in the other hand a hydrophobic polymer shows no inteaction with water .
You can investigate many function such us amines, acrylate, amide,acids,...
To Brahim Bouras:
hydrophilic polymer - not always denotes water soluble!
I say polymer water soluble is hydrophlic but the hydrophlic polymer is not always water soluble.(Hydrophylic polymer: the water file Inside the polymer)
Elena Yu. Ladilina,
What does make hydrophobic polymer as a hydrophilic polymers, please?
Alaa Almansoori,
If the polymer composition has a hydrophilic and hydrophobic groups, the same hydrophobic surface properties of the coating will depend on the substrate. On the polar substrate is a hydrophobic coating. Coating on the hydrophobic substrate is hydrophilic.
If the hydrophobic polymer contains no polar groups, a large increase in the number of such groups would make it hydrophilic.
Thank you Elena. Actually my materials is Nylon12 and the chemical structure is attached.
And I found it after processing the N12 was soluble in water! I am not sure what made it soluble. That is why I am asking about the change in hydrophobicity of polymers?
Nylon 12 has to be dissolved in water due to amide groups. It can be used as surfactant.
It can form in water particles with hydrocarbon groups inside and outside of the amide groups.
In simple words, I have two N12 powders, one is modified and the other is unmodified.
the unmodified is float on the top of water while the modified (its colour is also change to more yellowish) precipitate in the bottom of the water jar.
Do you think that the modified has become less hydrophobic, please?
Perhaps a modified has more polar groups? To confirm this, it is necessary to compare the IR spectra of the two polymers (film from a solution or powder).
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Materials Science
- Materials Chemistry
- Polymer Chemistry