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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and Characterization of poly(amide-Lmide)s and Their Precursors as Materials for Membranes
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Synthesis and Characterization of poly(amide-Lmide)s and Their Precursors as Materials for Membranes

机译：聚（酰胺-酰亚胺）及其前体作为膜材料的合成与表征

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Water soluble diamine amic acids (DAAs) were synthesized by reacting aliphatic diamines with pyromellitic dianhydride. Poly(amide-amic acid)s (PAAs) were prepared by interfacial polycondensation of DAAs in aqueous sodium hydroxide solution with isophthaloyl chloride in dichloromethane. Poly(amide-imide)s (PAIs) containing alternating (amide-amide)-(imide-imide) sequences were obtained by thermal cycloimidization of the PAA films at 175deg C for 4 h in a forced air woven. The PAIs were readily soluble in polar aprotic solvents such as dimethylformamide, dimethylacetamide, dimethylsulfoxide, and N-methyl-2-pyrrolidone. The inherent viscosities of the polymers are in the range of 0.97-1.7 dL/g. The polymers were characterized by IR, ~1H nuclear magnetic resonance (NMR), and thermogravimetric analysis (TGA). Thin film composite membranes containing PAA ultrathin barrier layer were prepared by in situ interfacial polycondnesation of DAA in water with trimesoyl chloride or isophthaloyl chloride in hexane on the surface of a porous polysulfone membrane. The membranes were characterized for water permeability and for the separation of NaCl and Na_2SO_4.
机译：通过使脂肪族二胺与均苯四甲酸二酐反应合成水溶性二胺酰胺酸（DAA）。聚（酰胺酰胺酸）（PAA）是通过将DAA在氢氧化钠水溶液中与间苯二甲酰氯在二氯甲烷中的界面缩聚制备的。含有交替的（酰胺-酰胺）-（酰亚胺-酰亚胺）序列的聚（酰胺-酰亚胺）（PAI）是通过在强制空气编织中在175摄氏度下将PAA膜热环化4小时而获得的。 PAI容易溶于极性非质子溶剂，例如二甲基甲酰胺，二甲基乙酰胺，二甲基亚砜和N-甲基-2-吡咯烷酮。聚合物的固有粘度在0.97-1.7dL / g的范围内。通过IR，〜1H核磁共振（NMR）和热重分析（TGA）对聚合物进行表征。通过在多孔聚砜膜表面上将DAA在水中与均苯三甲酰氯或间苯二甲酰氯在己烷中进行原位界面缩聚反应，制备了包含PAA超薄阻隔层的薄膜复合膜。所述膜的透水性和NaCl和Na_2SO_4的分离均被表征。

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