Explanation

solvent resistance of macromolecule materials refers to their ability to resist swelling and dissolution caused by solvent. In the solvent, small molecules in the solvent will penetrate into the interior of macromolecule materials, causing swelling of materials, which will increase its volume and mass, but the solubility of materials will decline. If the macromolecule does not have a crosslinking structure, swelling will continue and eventually lead to complete dissolution of materials. The swelling and dissolution behavior of materials is related to the molecular polarity, electron-negativity of materials and their interaction ability with solvents. Generally, polar macromolecule materials are dissolved in strong polar solvents, but not easily dissolved in non-polar solvents. Non polar macromolecule materials are easy to dissolve in non-polar solvents. If the electron-negativity of solvent and macromolecule materials is opposite, they will have strong affinity, which may lead to swelling and dissolution of macromolecule materials. In addition, the difference between the water solubility parameters of solvents and macromolecule materials will also affect their dissolution and swelling behavior. If these differences are large, their mutual solubility is weak, and materials are not easy to be soaked, so their solvent resistance is good. Therefore, when selecting macromolecule materials, solvent polarity, electron-negativity and water solubility parameters need to be considered to select suitable macromolecule materials to improve their resistance to solvents.

Classification