6FDA型聚酰亚胺共聚物(6FDA-TMPDA/DABA)的合成及气体渗透性能测试  

Synthesis and gas properties of 6FDA copolyimides(6FDA-TMPDA/DABA)

作　　者：张鑫巍[1] 范广宇[1] 李恕广[1] 邓麦村[1] 

机构地区：[1]中国科学院大连化学物理研究所,天邦膜技术国家工程研究中心,大连116023

出　　处：《膜科学与技术》2002年第2期5-9,共5页Membrane Science and Technology

摘　　要：合成了含有易交联极性基团 -COOH的新型 6FDA型聚酰亚胺共聚物 (6FDA -TM PDA/DABA) .6FDA(4,4’ -六氟亚异丙基 -邻苯二甲酸酐 )为二酐单体 ,TMPDA(2 ,4 ,6 -三甲基 - 1,3-苯二胺 )和DABA(3,5 -二氨基苯甲酸 )为二胺单体 .采用乌氏粘度计、DSC(差分扫描量热 )和TGA(热重量分析 )测定了共聚物的比浓粘度、Tg(玻璃化转变温度 )和Td(热分解温度 ) .比浓粘度均高于 0 36 ,说明合成的聚合物有较大的分子量 .Tg 在DSC升温至 4 0 0℃时测量不到 ,Td 均在 5 2 0℃以上 ,显示出合成的共聚物有很好的热稳定性 .在 30℃和 10 132 5Pa下测试了摩尔比为 3∶1、9∶1(TMPDA∶DABA)共聚物的H2 、CO2 和N2 的纯气渗透系数 .结果显示两种共聚物均有很高的渗透系数和CO2 /N2 的理想分离系数 .其中 6FDA -TMPDA/DABA 9∶1体系的CO2 纯气渗透系数达到 1 12 5× 10 - 13m3·m/ (m2 ·s·Pa)Novel crosslinkable 6FDA copolyimides containing strong polar carboxylic acid groups(i.e.6FDA-TMPDA/DABA)were synthesized.In the polymerization reaction 6FDA(4,4'-(hexafluoroisopropylidene)-diphthalic anhydride)was used as dianhydride monomer,TMPDA(2,4,6-trimethyl-1,3-phenylenediamine)and DABA(3,5-diamino benzoic acid)were used as diamine monomers.Viscosities,glass transition temperatures( T g),thermal decomposition temperatures( T d) of copolyimides were determined from the data with a Ubbelohde viscosimeter,a differential scanning calorimetry,a thermogravimetric analysis.Copolyimides exhibited good thermal properties,they showed no T g when temperatures rised about 400 ℃ T d were more than 520 ℃.Membranes of copolyimides 6FDA-TMPDA/DABA 9∶1 and 3∶1 were prepared.The permeabilities of two membranes for CO 2 and N 2 pure gases were determined at 30 ℃ and 101 325 Pa.Two membranes exhibited higher permeability and ideal selectivity for CO 2/N 2.The permeability of membrane 6FDA-TMPDA/DABA 9∶1 was 1.125×10 -13 m 3·m/(m 2·s·Pa).

关 键 词：6FDA型 聚酰亚胺共聚物 6FDA-TMPDA/DABA 合成 气体渗透 性能测试 分离膜 

分 类 号：TQ317[化学工程—高聚物工业]