Preparation method of conductive self-adhesion hydrogel with frost resistance and heat resistance
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A hydrogel and self-adhesive technology, which is applied in the field of preparation of conductive self-adhesive hydrogel, can solve the problems of constraints, poor environmental stability of conductive hydrogel, etc., and achieve excellent conductivity, high toughness and good effect
Inactive Publication Date: 2018-01-19
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
Therefore, the poor environmental stability of conductive hydrog
Method used
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Embodiment 1
[0016] A. Functionalization of conductive nanomaterials
[0017] 0.26 g of carbon nanotubes and 0.5 mg / ml of dopamine were reacted for 20 minutes under the condition of PH=8 to obtain a dispersion of dopamine-modified conductive nanomaterials.
[0018] B. Preparation of hydrogel
[0019] Weigh 2.0 g of acrylamide, 0.4 g of acrylic acid, 1% (wt.%) ammonium persulfate and 1% (wt.%) N,N-methylenebisacrylamide and add them into step A. Stir well to make it evenly mixed, then add 20% (vol.%) glycerin and 5ul tetramethylethylenediamine and stir well, and finally free radical polymerization forms a hydrogel.
Embodiment 2
[0021] A. Functionalization of conductive nanomaterials
[0022] 0.26 g of carbon nanotubes and 1 mg / ml of dopamine were reacted for 20 minutes under the condition of PH=10 to obtain a dispersion of dopamine-modified conductive material.
[0023] B. Preparation of hydrogel
[0024] Weigh 2.0 g of acrylamide, 0.4 g of acrylic acid, 5% (wt.%) ammonium persulfate (APS) and 1% (wt.%) N,N-methylenebisacrylamide and add them into step A. Stir well to make it evenly mixed, then add 50% (vol.%) glycerin and 10ul tetramethylethylenediamine and stir well, and finally free radical polymerization forms a hydrogel.
Embodiment 3
[0026] A. Functionalization of conductive nanomaterials
[0027] 0.26 g of carbon nanotubes and 2 mg / ml of dopamine were reacted for 25 minutes under the condition of PH=10 to obtain a dispersion of dopamine-modified conductive material.
[0028] B. Preparation of hydrogel
[0029] Weigh 2.0 g of acrylamide, 0.4 g of acrylic acid, 10% (wt.%) ammonium persulfate (APS) and 10% (wt.%) N,N-methylenebisacrylamide and add them into step A. Stir well to make it evenly mixed, then add 75% (vol.%) glycerin and 20ul tetramethylethylenediamine and stir well, and finally free radical polymerization forms a hydrogel.
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Abstract
The invention provides a preparation method of conductive self-adhesion hydrogel with frost resistance and heat resistance. According to the preparation method, a glycerin/water mixed solvent is adopted to replace a single solvent system in traditional hydrogel, and by means of polydopamine modification and synergistic effect of glycerin/water, dispersion of a conductive nanomaterial in hydrogel is improved and mechanical property and electrical conductivity of the hydrogel are enhanced. Meanwhile, the hydrogel is endowed with good self-adhesion property under synergism of glycerin and polydopamine. Besides, water is stably fixed in a polymer network under the action of strong hydrogen bonds between glycerin and water in a solvent system formed by glycerin and water through mixing, formation of ice crystal lattices can be broken at the low temperature, water volatilization is prevented at the high temperature, and the hydrogel is endowed with long-term stability, frost resistance and heat resistance. The prepared conductive self-adhesion hydrogel with frost resistance and heat resistance can be taken as a bioelectrode for collecting biological signals under some extreme conditions,and can also be taken as wearable dressing for protecting skin from frostbite or burn.
Description
technical field [0001] The invention relates to the technical field of hydrogel application and preparation, in particular to a method for preparing a conductive self-adhesive hydrogel with antifreeze / heat resistance properties. Background technique [0002] Due to their flexibility, conductive hydrogels can be used in related bioelectronic devices of the human body, such as wearable electronics, artificial intelligence tactile sensors, health monitoring electrodes, etc. Traditional conductive hydrogels are generally formed based on conductive polymers, such as polyaniline, polypyrrole, poly-3,4-ethylenedioxythiophene, etc. However, such hydrogels have poor mechanical properties and flexibility, so limit its practical application. [0003] Recently, there have been researches on combining carbon-based nanomaterials and metal nanoparticles in polymer networks to successfully prepare conductive hydrogels. However, poor dispersion of conductive nanomaterials in aqueous soluti...
Claims
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