Polyvinyl alcohol/graphene oxide composite film preparation method
A graphene composite and polyvinyl alcohol technology, applied in the field of preparation of polyvinyl alcohol/graphene oxide composite films, can solve problems such as poor oxygen barrier properties, achieve great practical and popularization value, good environmental protection, and safety high effect
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Embodiment 1
[0051] First weigh 5g of expandable graphite and add it to 125ml of 98% concentrated H 2 SO 4 , stirred in an ice-water bath to prepare mixture a; then to mixture a, gradually add 20g KMnO 4 , the reaction was carried out at a temperature of 10°C for 2h, and then the reaction was continued for 1h in a constant temperature water bath at 35°C to obtain a mixture b; then 500ml of deionized water and 10ml of 30% H 2 o 2 , stir well and filter the mixture while hot to obtain a pasty mixture; wash the pasty mixture repeatedly with 40ml of 5% HCl solution and a large amount of deionized water until there is no SO in the filtrate 4 2- , and then disperse the pasty mixture in 3000ml of deionized water by ultrasonic action, and finally dry the dispersion at 50°C for 48h to obtain 7g of dry graphite oxide.
[0052] Take 0.1g of dry graphite oxide and add it to 100ml of deionized water, ultrasonicate at 25°C with an ultrasonic power of 100W, and stir for 2h to obtain a graphene oxide ...
Embodiment 2
[0059] First weigh 4g of expandable graphite and add it to 100ml of 98% concentrated H 2 SO 4 , stirred in an ice-water bath to prepare mixture a; then to mixture a, gradually add 18g KMnO 4 , the reaction was carried out at a temperature of 12°C for 2h, and then the reaction was continued for 1h in a constant temperature water bath at 35°C to obtain a mixture b; then 450ml of deionized water and 8ml of 30% H 2 o 2 , stir well and filter the mixture while hot to obtain a pasty mixture; wash the pasty mixture repeatedly with 35ml of 5% HCl solution and a large amount of deionized water until there is no SO in the filtrate 4 2- , and then disperse the pasty mixture in 2500ml of deionized water by ultrasonic action, and finally dry the dispersion at 40°C for 72h to obtain 6g of dry graphite oxide.
[0060] Add 0.05g of dry graphite oxide into 50ml of deionized water, ultrasonicate at 30°C with an ultrasonic power of 100W, and stir for 1.5h to obtain a graphene oxide colloidal...
Embodiment 3
[0063] First weigh 2g of expandable graphite and add it to 100ml of concentrated H2O with a concentration of 98%. 2 SO 4 , stirred in an ice-water bath to prepare mixture a; then to mixture a, gradually add 10g KMnO 4 , the reaction was carried out at a temperature of 15°C for 2h, and then the reaction was continued for 1h in a constant temperature water bath at 35°C to obtain a mixture b; then 400ml of deionized water and 5ml of 30% H 2 o 2 , stir well and filter the mixture while hot to obtain a pasty mixture; wash the pasty mixture repeatedly with 30ml of 5% HCl solution and a large amount of deionized water until there is no SO in the filtrate 4 2- , and then the pasty mixture was dispersed in 2000ml of deionized water by ultrasonic action, and finally the dispersion was dried at 45°C for 60h to obtain 3.4g of dry graphite oxide.
[0064] Add 0.025g of dry graphite oxide into 25ml of deionized water, ultrasonicate at 40°C with an ultrasonic power of 100W, and stir for ...
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