Preparation method of ternary polyacrylonitrile copolymer
A technology of polyacrylonitrile and copolymer, which is applied in the field of preparation of ternary polyacrylonitrile copolymer, can solve the problems of narrow exothermic peak and concentrated exothermic, and achieve the effects of narrow distribution, gentle polymerization process and high conversion rate
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Embodiment 1
[0027] Under the protection of nitrogen, first raise the temperature of the aqueous solution of maleic anhydride, acrylamide and polyvinyl alcohol to 65 ° C, then add acrylonitrile monomer to keep the temperature for 30 minutes, and finally add the dimethyl sulfoxide solution dissolved in azobisisobutyronitrile, After reacting for 6 hours, the conversion rate was 91.7%, and the viscosity-average molecular weight was 2.97×10 5 , a polyacrylonitrile copolymer with a molecular weight distribution of 1.56. According to the DSC test under nitrogen atmosphere (Using the Q20 differential scanning calorimeter of American TA company, rising from 30°C to 310°C at a rate of 5°C / min), it can be seen that the cyclization initiation temperature is higher than that of homopolyacrylonitrile (the same Prepared under polymerization conditions, the viscosity-average molecular weight (molecular weight: 302,000) decreased by 27.6°C; the exothermic heat of cyclization was 567.3J / g, which was 54.4J / ...
Embodiment 2
[0031] According to the formula in Table 2, under the protection of nitrogen, the aqueous solution of maleic anhydride, acrylamide and polyvinyl alcohol was first heated to 65°C, then the acrylonitrile monomer was added to keep the temperature for 30 minutes, and finally the diisobutyronitrile dissolved in azobisisobutyronitrile was added. Methyl sulfoxide solution was reacted for 6 hours to obtain a conversion rate of 90.3% and a viscosity-average molecular weight of 2.89×10 5 , a polyacrylonitrile copolymer with a molecular weight distribution of 1.74. According to the DSC test under nitrogen atmosphere (Using the Q20 differential scanning calorimeter of American TA company, rising from 30°C to 310°C at a rate of 5°C / min), it can be seen that the cyclization initiation temperature is higher than that of homopolyacrylonitrile (the same Prepared under polymerization conditions, the viscosity-average molecular weight (molecular weight: 308,000) decreased by 29.0°C; the exotherm...
Embodiment 3
[0035] According to the formula in Table 3, under the protection of nitrogen, the aqueous solution of maleic anhydride, acrylamide and polyvinyl alcohol was first heated to 65 °C, then the acrylonitrile monomer was added to keep the temperature for 30 minutes, and finally the dimethyl solution dissolved in azobisisobutyronitrile was added. base sulfoxide solution, reacted for 6h, obtained a conversion rate of 94.6%, and a viscosity-average molecular weight of 3.06×10 5 , a polyacrylonitrile copolymer with a molecular weight distribution of 1.91. According to the DSC test under nitrogen atmosphere (Using the Q20 differential scanning calorimeter of American TA company, rising from 30°C to 310°C at a rate of 5°C / min), it can be seen that the cyclization initiation temperature is higher than that of homopolyacrylonitrile (the same Prepared under polymerization conditions, the viscosity-average molecular weight is 325,000) decreased by 31.4°C; the exothermic heat of cyclization is...
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