Isopropyl acrylamide polyalcohol hydrogel and synthesizing method

Abstract

The invention relates to an N-isopropyl acrylamide (NIPA) polymer hydrogel and a synthetic method thereof. The hydrogel comprises the following components (wt%) of: NIPA 8-15%, low critical solution temperature (LCST) regulator 0-4%, initiation reducer 0.02-0.05%, crosslinker 0.1-0.15%, initiation oxidizer 0.03-0.07%, and water 91.85-80.73%. The synthetic method comprises the steps of: (1) determining the composition of the hydrogel; (2) dissolving an NIPA monomer in part of water to obtain an NIPA monomer aqueous solution; (3) adding the crosslinker in the NIPA monomer aqueous solution; (4) respectively dissolving the initiation reducer and the initiation oxidizer in part of water; (5) mixing the NIPA monomer aqueous solution and the aqueous solution of the initiation reducer in a container; (6) replacing the air on the surface and the surroundings of the container with nitrogen gas; (7) adding the aqueous solution of the initiation oxidizer into the container, mixing, and replacing with nitrogen gas for several minutes; (8) sealing the container, and reacting for several hours to obtain a gel product; and (9) washing with water to remove the toxicity of the residual non-reacted monomer on the surface of the gel product.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to an isopropylacrylamide (NIPA) polymer hydrogel and a synthesis method thereof. Background technique [0002] Polymer gel is a soft and wet material with both liquid and solid properties. It is a multi-component system composed of a three-dimensional cross-linked network of polymers and a small molecule solvent fixed in it. It is a cross-linked polymer swelling body that cannot be melted and has certain elasticity. This material can respond softly to environmental changes, such as pH value, temperature, light intensity, electric field, magnetic field and other stimuli, as well as chemical substances. The polymer gel that can respond softly to changes in environmental temperature is called thermosensitive gel. Thermosensitive gel is a kind of intelligent polymer that can reversibly expand and contract with changes in environmental temperature, and has volume ...

AI Technical Summary

Problems solved by technology

But the synthetic isopropylacrylamide (NIPA) polymer gel that obtains in the prior art, the transparency of colloid, elasticity, temperature response performance are all relatively poor, mainly be that the proportioning of its component is unreasonable, to the requirement of reaction The temperature and gas environment are not clearly stated, it is not an ideal combination of reaction environment, and the lower critical solution temperature (LCST) cannot be adjusted, so the obtained gel product has a narrow application range and cannot meet the practical requirements in many aspects. application needs