【摘要】 采用水相沉淀聚合法制备了含有0-25 mol%丙烯酰胺(AM)的丙烯腈(AN)-丙烯酰胺共聚物,采用傅立叶变换红外光谱(FTIR)、核磁共振光谱(NMR)、差示扫描量热仪(DSC)、热重分析(DTG)和X射线衍射分析(XRD)等方法对聚合产物进行了表征。结果表明,聚合产物中AM的摩尔含量略高于投料比,随AM摩尔含量的增加,共聚物的分解温度先降低后又升高。共聚物中AM含量为20mol%时分解温度仅为262.5℃;放热量先减少后增加。AM的引入将聚合物的环化机理从自由基环化机理过渡为离子基环化机理。更多还原

【Abstract】 Acrylonitrile(AN)/Acrylamide(AM) copolymers containing 0～25 mol% AM were synthesized by deposition polymerization in water.Fourier Transform Infra-red microscopy(FTIR),Nuclear Magnetic(NMR),Differential Scanning Calorimetry(DSC),Derivative Thermogravimetry(DTG) and X-ray Diffraction(XRD) etc were used to characterize the structures and properties of the copolymers.The results show that,the measured AM molar ratios in the copolymers are slightly higher than the theoretical values,which are calculated from the raw material ratios.The molar ratio of AM affects the decomposition temperature,the exothermic heat and crystallinity of the copolymers.The decomposition temperature of the copolymer decreases firstly and then rises with the increase of the AM molar ratio.The decomposition temperature drops to 262.5℃ when the content of AM is 20 mol%.The quantity of exothermic heat also decreases firstly and then increases with the increase of AM molar ratio.The presence of AM changes the cyclization reaction mechanism of the copolymers from a free radical cyclization reaction to an ionic one.更多还原