Method for preparing macroporous quick-response polyacrylamide hydrogel by adopting frontal polymerization of acrylamide deep-eutectic solvent

Abstract

The invention discloses a method for preparing macroporous quick-response polyacrylamide hydrogel by adopting frontal polymerization of an acrylamide deep-eutectic solvent, and belongs to the technical field of preparation of functional polymer materials. The method comprises the following steps: mixing acrylamide with a halogen-containing ammonium salt or halogen-containing quaternary ammonium salt or halogen-containing phosphonium salt compound, stirring at 80-100 DEG C until a transparent and clear liquid is formed, and cooling to obtain an acrylamide-based deep-eutectic solvent; adding a cross-linking agent and an initiator into the deep-eutectic solvent at the temperature of not lower than 35 DEG C to form a mixture solution; transferring the formed mixture solution into a tubular reactor, heating at the upper end or the lower end of the reactor by adopting a heat source to initiate a reaction, and removing the heat source until all the raw materials in the whole reactor are converted into polymer gel after the thermal initiation reaction is started; and soaking and washing the obtained polymer gel with distilled water, and freeze-drying to obtain the target hydrogel. No extraliquid solvent is needed, the polymerization speed is high, the reaction time is short, and the energy consumption is low.

Description

technical field [0001] The invention specifically relates to a method for preparing a macroporous fast-response polyacrylamide hydrogel by front-end polymerization of an acrylamide-based deep eutectic solvent, and belongs to the technical field of preparation of functional polymer materials. Background technique [0002] Hydrogel is a three-dimensional network composed of hydrophilic polymers, which itself is insoluble in water, but can absorb a large amount of water to swell. According to the response to external stimuli, hydrogels can be divided into two categories: traditional hydrogels and environment-sensitive hydrogels. Traditional hydrogels are not sensitive to changes in the environment such as changes in temperature or pH, while environmentally sensitive hydrogels are those that can sense the external environment (such as temperature, pH, ultrasound, light, electricity, glucose, etc.) Changes or stimuli, and can produce corresponding changes in physical structure a...

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Problems solved by technology

[0004] Aiming at the problems in the prior art, the present invention provides a method for preparing macroporous and fast-response polyacrylamide hydrogels by using front-end polymerization of acrylamide-based deep eutectic solvents. In this method, hydrogen bond donor acrylamide and hydrogen bond Acceptors (halogen-containing ammonium salts or halogen-containing quaternary ammonium salts or halogen-containing phosphonium salt compounds) are mixed and heated to obtain a stable non-toxic liquid acrylamide-based deep eutectic solvent, and then the deep eutectic solvent liquid is used as a unit of front-end polymerization Body and medium for front-end polymerization to synthesize polyacrylamide hydrogel, the method of the present invention can stably carry out front-end polymerization without using additional liquid solvent for dissolution, can avoid the use of high-boiling point toxic organic solvent dimethyl sulfoxide, and accelerate front-end polymerization The polymerization rate shortens the reaction time of the front-end polymerization, reduces the production energy consumption, and can solve the problem of using the toxic high-boiling point dimethyl sulfoxide organic solvent system in the prior art to prepare polyacrylamide hydrogel for the front-end polymerization of the medium, and the polymerization speed Slower, dimethyl sulfoxide is more polluting to the environment, and it is easy to remain in the polymer gel product, it is not easy to remove, and the disadvantage of affecting the purity of the product

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