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苯乙烯-苯二乙烯共聚体在三氯化铝存在下,与三氯化磷起反应,随以硝酸氧化之,制成交换量与直径(由0.15—0.75毫米)不同的膦酸阳离子交换树脂。交换量,膨胀度与水分,因苯二乙烯与树脂直径的递增而减少。从磷含量的实验值与交换量测定的结果,知道每苯环上约含0.76—0.85％原子的磷,且大部分成五价膦酸存在。电位滴定曲线证明这些树脂为二元酸。
Styrene-styrene divinyl-ene copolymer reacts with phosphorus trichloride in the presence of aluminum trichloride and is oxidized with nitric acid to produce a phosphonic acid cation exchange resin with a different amount of exchange (from 0.15 to 0.75 mm in diameter) . Exchange volume, degree of expansion and moisture, due to styrene diamine and resin diameter decreases. From the experimental results of the phosphorus content and the results of the exchange amount measurement, it is known that phosphorus is contained in an amount of about 0.76 to 0.85% of atoms per benzene ring, and most of them are pentavalent phosphonic acids. Potentiometric curves demonstrate that these resins are dibasic acids.