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本文合成了一系列均聚和共聚酰亚胺,研究了它们对H_2、O_2和N_2三种气体的透过性能与分子结构之间的关系。结果表明,在30℃和6atm的条件下,SiDA-ODA对H_2和O_2的透过系数分别为11.7和0.764Barrer,比BPDA-ODA高一个数量级;H_2/N_2和O_2/N_2分离系数分别为113和7.4在(BPDA/SiDA)-ODA共聚物中,随着SiDA含量的增加,其透氢系数P_(H_2)和透氧系数P_(O_2)均有较大的增加,而H_2/N_2和O_2/N_2分离系数则降低。当SiDA含量占二酐组分的60%时,P_(H_2)和P_(H_2)/P_(N_2)分离系数分别达8.78Barrer和147。
In this paper, a series of homopolymers and copolyimides were synthesized and the relationship between them and the molecular structure of H_2, O_2 and N_2 gases was studied. The results show that at 30 ℃ and 6 atm, the permeation coefficients of Si-ODA to H 2 and O 2 are 11.7 and 0.764 Barrer respectively, which is an order of magnitude higher than that of BPDA-ODA. The separation coefficients of H 2 / N 2 and O 2 / N 2 are 113 And 7.4 in the (BPDA / SiDA) -ODA copolymers, the hydrogen permeation coefficient P_ (H_2) and the oxygen permeability coefficient P_ (O_2) increased with the increase of SiDA content, while the contents of H_2 / N_2 and O_2 / N2 separation factor is reduced. When the content of SiDA was 60% of the dianhydride component, the separation coefficients of P_ (H_2) and P_ (H_2) / P_ (N_2) were 8.78 Barrer and 147, respectively.