The pyrolysis reaction of acrylonitrile(AN)/N-vinylpyrrolidone(N-VP) copolymer in air was studied with DSC. The apparent activation energy of pyrolysis reaction of copolymer was calculated by the Kissinger method. The...The pyrolysis reaction of acrylonitrile(AN)/N-vinylpyrrolidone(N-VP) copolymer in air was studied with DSC. The apparent activation energy of pyrolysis reaction of copolymer was calculated by the Kissinger method. The effect of different copolymerization conditions on the apparent activation energy of copolymer was discussed. It was found that with an increase of DMSO concentration in mixture solvent,the degradation apparent activation energy rose rapidly. When the weight ratio of N-VP/AN was less than 5/95, the apparent activation energy of degradation reduced quickly with the comononer N-VP concentration rising, and when the ratio was more than 5/95, the apparent activation energy became almost constant. When the copolymerization temperature rose, the apparent activation energy also increased.展开更多
Effect of inorganic salts on viscosities of dimethyl sulphoxide(DMSO)solutions of acrylonitrile(AN)/ N vinylpyrrolidone( N VP) copolymer was discussed Viscosity was determined by revolving viscosimeter It was shown th...Effect of inorganic salts on viscosities of dimethyl sulphoxide(DMSO)solutions of acrylonitrile(AN)/ N vinylpyrrolidone( N VP) copolymer was discussed Viscosity was determined by revolving viscosimeter It was shown that solution viscosity decreased quickly with addition of KCl and NaCl and the effect of NaCl was more prominent than KCl As the concentration of KCl and NaCl beyond 0 025 mol·L -1 , the viscosity tended to increase The viscosity increased considerably with addition of FeCl 3 and CuCl 2 The change of solution viscosity became less obvious with addition of ZnCl 2 With increasing temperature, the viscosity of copolymer solution containing NaCl decreased most quickly and the copolymer solution containing FeCl 3 decreased most展开更多
文摘The pyrolysis reaction of acrylonitrile(AN)/N-vinylpyrrolidone(N-VP) copolymer in air was studied with DSC. The apparent activation energy of pyrolysis reaction of copolymer was calculated by the Kissinger method. The effect of different copolymerization conditions on the apparent activation energy of copolymer was discussed. It was found that with an increase of DMSO concentration in mixture solvent,the degradation apparent activation energy rose rapidly. When the weight ratio of N-VP/AN was less than 5/95, the apparent activation energy of degradation reduced quickly with the comononer N-VP concentration rising, and when the ratio was more than 5/95, the apparent activation energy became almost constant. When the copolymerization temperature rose, the apparent activation energy also increased.
文摘Effect of inorganic salts on viscosities of dimethyl sulphoxide(DMSO)solutions of acrylonitrile(AN)/ N vinylpyrrolidone( N VP) copolymer was discussed Viscosity was determined by revolving viscosimeter It was shown that solution viscosity decreased quickly with addition of KCl and NaCl and the effect of NaCl was more prominent than KCl As the concentration of KCl and NaCl beyond 0 025 mol·L -1 , the viscosity tended to increase The viscosity increased considerably with addition of FeCl 3 and CuCl 2 The change of solution viscosity became less obvious with addition of ZnCl 2 With increasing temperature, the viscosity of copolymer solution containing NaCl decreased most quickly and the copolymer solution containing FeCl 3 decreased most
