Despite efforts by the membrane community to develop polymeric materials with improved O 2 /N 2 separation performance, limited progress has occurred for almost a decade. Molecular sieving media, which can exhibit gas separation properties superior to polymers, tend to be brittle and uneconomical to
Gas transport properties of polyimides and polypyrrolone containing ester linkage
β Scribed by Gao Xuesong; Lu Fengcai
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 338 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0032-3861
No coin nor oath required. For personal study only.
π SIMILAR VOLUMES
## Abstract A series of novel polyimides was prepared from various diamines (with bisphenol units) and various aromatic tetracarboxylic dianhydrides via a twoβstep (thermal imidization) method. The monomers and polymers were produced in high yields. The benzophenone series exhibited better solubili
Aromatic polyimides derived from 2,2'-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (GFDA) and 3 3 -or 4,4'-diaminodiphenylsulfone (m-DDS or p-DDS) have been synthesized with a chemical imidization. The disappearance of amic acid groups and the appearance of imide groups are determined by I