Preparation method of temperature, pH and ultraviolet multi-stimuli-responsive semi-interpenetrating network nanocomposite hydrogel
A semi-interpenetrating network and nano-composite technology is applied in the field of preparation of smart gels to achieve uniform cross-linking, few cross-linking points and good mechanical properties.
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Embodiment 1
[0039]
[0040] Example 2
[0041] Dissolve 4g of NIPA, 0.22g of 4-[(4-acryloyloxy)phenylazo]benzoic acid, 1.22g of lithium diatomaceous earth, and 0.094g of sodium pyrophosphate in 40g of water and place it in a container under nitrogen protection at 0 Stir in an ice bath at °C for 120 minutes until uniform and transparent, then add 0.6g of CMC, and continue to stir for 2 hours to obtain a uniform and transparent pre-polymerization solution; dissolve 0.04g of KPS and 0.03g of TEMED in 2g of water, stir well and add to the pre-polymerization solution, nitrogen Stir quickly under protection for 2 minutes until uniform; then pour into a mold of a certain shape and react at 0°C for 24 hours, and then react at room temperature for 24 hours. After the obtained gel is taken out, the product is obtained by soaking and changing water repeatedly in deionized water.
Embodiment 2
[0043] Example 3
[0044] Dissolve 4.5g of NIPA, 0.2g of 4-[(4-acryloyloxy)phenylazo]benzoic acid, 2.1g of lithium diatomaceous earth, and 0.161g of sodium pyrophosphate in 45g of water and place it in a container under nitrogen protection at Stir in an ice bath at 0°C for 120 minutes until uniform and transparent, then add 0.8g of CMC, continue to stir for 2 hours to obtain a uniform and transparent pre-polymerization solution; dissolve 0.045g of KPS and 0.034g of TEMED into 2.25g of water, stir well and add to the pre-polymerization solution , under the protection of nitrogen, stir rapidly for 2 minutes until uniform; then pour it into a mold of a certain shape and react at 0°C for 24 hours, and then react at room temperature for 24 hours. After the obtained gel is taken out, the product is obtained by soaking and changing water repeatedly in deionized water.
Embodiment 3
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