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定型纤维状或无定型的聚丙烯腈在高温压力下均可用水水解,且产物中含有酰胺、酰亚胺、羧酸铵盐,经减压干燥后,铵盐部分分解成羧酸,最后的平均相对组成为:羧酸∶铵盐∶酰胺∶酰亚胺≈13∶36∶18∶33。 在我们的反应条件下,聚丙烯腈产生严重的断链现象,分子量大为降低,特别是未经喷丝成型的浆块更严重。 用阳离子交换树脂交换之后再进行分析的方法,一方面避免了滴定两种不同羧基(游离羧基、铵盐的羧基)之间的干扰,同时亦避免了通常方法测定铵盐时酰胺的干扰,因而数据更为可靠。
Stereotyped fibrous or amorphous polyacrylonitrile can be hydrolyzed under high temperature and pressure, and the product contains amide, imide, ammonium carboxylate, dried under reduced pressure, the ammonium salt partially decomposed into carboxylic acid, the last The average relative composition was: carboxylic acid: ammonium salt: amide: imide ≈ 13:36:18:33. Under our reaction conditions, polyacrylonitrile produced serious chain scission phenomenon, the molecular weight is greatly reduced, especially the pulp which is not spinnable is more serious. The method of exchange after cation exchange resin analysis avoids the interference between the titration of two different carboxyl groups (free carboxyl groups, carboxyl groups of ammonium salts) and also avoids the interference of amides in the usual method for the determination of ammonium salts and thus Data is more reliable.