The present disclosure relates to a membrane for flue gas separation containing a crosslinked, thermally rearranged poly(benzoxazole-co-imide) copolymer prepared simply by heat-treating a membrane prepared from an o-hydroxypolyimide copolymer having carboxylic acid groups such that thermal crosslinking and thermal rearrangement occur simultaneously or a membrane for flue gas separation containing a crosslinked, thermally rearranged poly(benzoxazole-co-imide) copolymer having a benzoxazole group content of less than 80% in the polymer chain, prepared from transesterification crosslinking of an o-hydroxypolyimide copolymer having carboxylic acid groups and a diol-based compound followed by thermal rearrangement, and a method for preparing the same.
In accordance with the present disclosure, a crosslinked, thermally rearranged poly(benzoxazole-co-imide) copolymer membrane for flue gas separation can be prepared simply through heat treatment without requiring a complicated process such as chemical crosslinking, UV irradiation, etc. for forming a crosslinked structure and a membrane for flue gas separation prepared therefrom exhibits superior permeability and selectivity. Also, the method is applicable to commercial-scale production because the preparation process is simple.
本公开涉及一种用于烟气分离的膜,该膜含有一种交联的热重排聚(
苯并恶唑-
酰亚胺)共聚物,其制备方法很简单,即对由具有
羧酸基团的邻羟基聚
酰亚胺共聚物制备的膜进行热处理,使热交联和热重排同时发生,或者涉及一种用于烟气分离的膜,该膜含有一种交联的热重排聚(
苯并恶唑-
酰亚胺)共聚物,其制备方法很简单,即对由具有
羧酸基团的邻羟基聚
酰亚胺共聚物制备的膜进行酯化交联、由具有
羧酸基团的邻羟基聚
酰亚胺共聚物和二元醇基化合物经酯交换交联后再进行热重排制备的聚合物链中
苯并恶唑基团含量低于80%的热重排聚(
苯并恶唑-
酰亚胺)共聚物,以及制备该共聚物的方法。
根据本公开内容,可通过热处理简单地制备用于烟气分离的交联热重排聚(
苯并恶唑-
酰亚胺)共聚物膜,而无需复杂的
化学交联、紫外线照射等形成交联结构的过程,由此制备的烟气分离膜具有优异的渗透性和选择性。此外,由于制备工艺简单,该方法适用于商业规模生产。