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離子交換膜按膜的宏觀結構分的三大類
日期:[2023-5-29 15:42:13]   文章錄入:www.penangsiddha.com   共閱[307]次
  離子交換膜是具有離子交換性能的、由高分子材料制成的薄膜,它與離子交換樹脂相似,都是在高分子骨架上連接一個活性基團,但作用機理和方式、效果都有不同之處。當前市場上離子交換膜種類繁多,也沒有統一的分類方法。一般按膜的宏觀結構分為三大類:
  1. 非均相離子交換膜
  由粉末狀的離子交換樹脂加黏合劑混煉、拉片、加網熱壓而成,樹脂分散在黏合劑中,因而其化學結構是不均勻的。
  2. 均相離子交換膜
  均相離子交換膜系將活性基團引入一惰性支持物中制成,它沒有異相結構,本身是均勻的。其化學結構均勻,孔隙小,膜電阻小,不易滲漏,電化學性能優良,在生產中應用廣泛。但制作復雜,機械強度較低。
  3. 半均相離子交換膜
  也是將活性基團引入高分子支持物制成的。但兩者不形成化學結合,其性能介于均相離子交換膜和非均相離子交換膜之間。
  此外,離子交換膜按功能及結構的不同,可分為陽離子交換膜、陰離子交換膜、鑲嵌離子交換膜、聚電解質復合物膜五種類型。
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