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东华大学 纤维材料改性国家重点实验室 上海 201620
E-mail: dj01@dhu.edu.cn
纸质出版日期:2022-05-20,
网络出版日期:2022-03-18,
收稿日期:2021-10-19,
录用日期:2021-12-31
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肖娴,徐小尘,李琇廷等.含聚醚链段聚酰亚胺膜的制备及气体分离性能[J].高分子学报,2022,53(05):505-513.
Xiao Xian,Xu Xiao-chen,Li Xiu-ting,et al.Preparation and Gas Separation Properties of Polyimide Membranes Containing Polyether Segments[J].ACTA POLYMERICA SINICA,2022,53(05):505-513.
肖娴,徐小尘,李琇廷等.含聚醚链段聚酰亚胺膜的制备及气体分离性能[J].高分子学报,2022,53(05):505-513. DOI: 10.11777/j.issn1000-3304.2021.21313.
Xiao Xian,Xu Xiao-chen,Li Xiu-ting,et al.Preparation and Gas Separation Properties of Polyimide Membranes Containing Polyether Segments[J].ACTA POLYMERICA SINICA,2022,53(05):505-513. DOI: 10.11777/j.issn1000-3304.2021.21313.
利用均苯四甲酸二酐(PMDA)与4
4
'
-二氨基二苯醚(ODA)和聚醚胺(PPO
M
n
~2000)共聚合,合成聚酰胺酸前驱体,经热处理得到一系列含PPO链段的聚酰亚胺薄膜. 研究了PPO链段的引入对薄膜结构及气体分离性能的影响. 结果表明,在芳香族聚酰亚胺中引入柔性链段PPO有利于气体分子的传输. 得益于PPO链段在分离膜内部形成的微相分离结构,气体分子在分离膜内的扩散系数随PPO含量的增加显著提升. 当PPO含量为65 wt%时,PPO链段在分离膜内仍呈现非晶相,CO
2
渗透系数高达131.61 Barrer,比PMDA/ODA均聚聚酰亚胺薄膜提高22倍. 同时,得益于聚醚链段对CO
2
独特的亲和作用,随着PPO含量的提高,分离膜对CO
2
/N
2
的分离系数由18.77提高至30.12. 结果表明PPO链段的引入对于调控聚酰亚胺膜的结构和气体分离性能具有重要作用.
A series of polyimide membranes containing polyether amine (PPO) segment were successfully synthsized by thermal imidization of the poly(amic acid) (PAA) precursors copolymerized of pyromellitic dianhydride (PMDA) with 4
4
'
-diaminodiphenyl ether (ODA) and amine functionalized polyether amine (
M
n
~2000). The effects of PPO on the microstructure and gas separation property of the resultant membranes were investigated in detail. The results show that the fractional free volume (FFV) of the membranes increases with the content of the PPO. Meanwhile
a micro-phase separation behavior is detected in the resultant membranes with the incorparation of PPO
which can act as the continuous gas transmission channel. As a consequence
the permeability of the membrane increases rapiadly. As the PPO content reaches 65 wt%
the CO
2
permeability is as high as 131.61 Barrer
which is nearly 22 times higher than that of the PMDA/ODA homopolyimide membrane. Moreover
due to the special interaction between the PPO and CO
2
the CO
2
/N
2
selectivity increases from 18.77 for the PMDA/ODA membrane to 30.12 for the copolyimide membrane with 65 wt% PPO. Accordingly
the incorporation of PPO plays an important role in modifying the microstructure and gas separation property for the polyimide membranes.
聚酰亚胺聚醚胺气体分离膜相分离
PolyimidePolyether amineGas separation membraneMicro-phase separation
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