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Hsu, Shou-Chian; Whang, Wha–Tzong; Chen, Shih-Chia

doi:10.1023/a:1021399617498

Cited by 15 publications

(2 citation statements)

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“…The 6FDA-4BAO homopolymer have been prepared previously in a two-step polycondensation reaction, by preparing first the poly(amic acid) derivative at room temperature followed by a thermal imidization during film formation to obtain mechanically stable membranes. 32,33,58 In our study, we followed similar reaction conditions (one-step thermal imidization) to that used by Damaceanu et al to prepare copolyimides containing the 4BAO monomer. 59 Equimolar amounts of 6FDA and 4BAO were added to NMP in the presence of 5% LiCl, and the reaction mixture was heated to 200 °C for 8 h (Scheme 2a).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Such materials combine the properties of polyimides and polyoxadiazoles to afford a new class of materials with improved chemical and thermal stability, mechanical strength, and processability, which make them suitable for membrane-based gas separation applications. It is worth mentioning that poly(imide–oxadiazole)s have been used for several other applications because of their improved optical properties, − thermal stability, , electron transport, − electrochemistry, and so on. To the best of our knowledge, the gas permeation properties of poly(imide–oxadiazole)s have not been reported previously.…”

Section: Introductionmentioning

confidence: 99%

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Molecular Design of Poly(imide–oxadiazole) Membranes for High-Pressure Mixed-Gas Separation

et al. 2022

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The design of new polymeric materials and the search for new classes of polymers for industrial application in membrane-based gas separation have been the focus of several research groups worldwide. Membranes with high productivity and efficiency under harsh operational conditions of pressure and temperature during mixed-gas separation are of great interest. In this paper, we report the preparation of a series of block copolymers of poly(imide−oxadiazole)s built from 6FDA, Durene, and four different 1,3,4-oxadiazole-based monomers. The pureand mixed-gas separation properties of their corresponding membranes were measured. The mixed-gas separation data were collected at a high feed pressure of up to 900 psi. Such mixed-gas separation testing under harsh conditions is required to subject the membranes to environments similar to industrial use. For example, the mixed-gas CO 2 permeability of 6FDA-Durene/6FDA-4BAO(Me) (3:1) was measured at 900 psi to be ∼130 barrer, and the CO 2 /CH 4 selectivity is around ∼24. These results of permeability and selectivity of poly(imide−oxadiazole) membranes at such high gas feed pressure are considered very attractive and are superior to many glassy polymers reported in the literature and that are industrially observed membranes. This work illustrates well a case scenario of structure−property relationship and demonstrates the exclusivity of mixed-gas testing which could not be predicted from the ideal situation of pure-gas testing. In the near future, the mixed-gas separation properties of thin layer composite and hollow fibers will be evaluated.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Molecular Design of Poly(imide–oxadiazole) Membranes for High-Pressure Mixed-Gas Separation

et al. 2022

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Chemical Vapor Deposition of Conformal, Functional, and Responsive Polymer Films

et al. 2010

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Chemical vapor deposition (CVD) polymerization utilizes the delivery of vapor-phase monomers to form chemically well-defined polymeric films directly on the surface of a substrate. CVD polymers are desirable as conformal surface modification layers exhibiting strong retention of organic functional groups, and, in some cases, are responsive to external stimuli. Traditional wet-chemical chain- and step-growth mechanisms guide the development of new heterogeneous CVD polymerization techniques. Commonality with inorganic CVD methods facilitates the fabrication of hybrid devices. CVD polymers bridge microfabrication technology with chemical, biological, and nanoparticle systems and assembly. Robust interfaces can be achieved through covalent grafting enabling high-resolution (60 nm) patterning, even on flexible substrates. Utilizing only low-energy input to drive selective chemistry, modest vacuum, and room-temperature substrates, CVD polymerization is compatible with thermally sensitive substrates, such as paper, textiles, and plastics. CVD methods are particularly valuable for insoluble and infusible films, including fluoropolymers, electrically conductive polymers, and controllably crosslinked networks and for the potential to reduce environmental, health, and safety impacts associated with solvents. Quantitative models aid the development of large-area and roll-to-roll CVD polymer reactors. Relevant background, fundamental principles, and selected applications are reviewed.

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High‐Efficiency Photoluminescence Wholly Aromatic Triarylamine‐based Polyimide Nanofiber with Aggregation‐Induced Emission Enhancement

Yen

Wang

et al. 2013

Advanced Optical Materials

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Novel AIE‐active, high Tg (up to 420 °C), and solution‐processable wholly aromatic polyimides with triarylamine chromophores are synthesized and fabricated into highly efficient photoluminescence (PL) nanofibers by an electrospinning method. The PL intensity of polymer solutions is induced by aggregation in poor solvents, and they could be fabricated into solid films with high PL quantum yields of up to 22%, demonstrating their aggregation‐induced emission feature. Moreover, the electrospun nanofibers have the highest PL quantum yield of 26% among aromatic polyimides, suggesting their great potential for high‐performance optoelectronic applications.

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Cited by 15 publications

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Molecular Design of Poly(imide–oxadiazole) Membranes for High-Pressure Mixed-Gas Separation

Molecular Design of Poly(imide–oxadiazole) Membranes for High-Pressure Mixed-Gas Separation

Chemical Vapor Deposition of Conformal, Functional, and Responsive Polymer Films

High‐Efficiency Photoluminescence Wholly Aromatic Triarylamine‐based Polyimide Nanofiber with Aggregation‐Induced Emission Enhancement

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