A5078274943- Synthesis and properties of polymers
- Membrane Separation and Gas Transport
- Fuel Cells and Related Materials
- Covalent Organic Framework Applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Silicone and Siloxane Chemistry
- Epoxy Resin Curing Processes
- Dielectric materials and actuators
- Advanced Battery Materials and Technologies
- Membrane Separation Technologies
- Advanced battery technologies research
- Metal-Organic Frameworks: Synthesis and Applications
- Membrane-based Ion Separation Techniques
- Luminescence and Fluorescent Materials
- Synthetic Organic Chemistry Methods
- Molecular Sensors and Ion Detection
- Conducting polymers and applications
- Graphene research and applications
- Advanced ceramic materials synthesis
- Mesoporous Materials and Catalysis
- Tribology and Wear Analysis
- High voltage insulation and dielectric phenomena
- Polymer composites and self-healing
- Organic Electronics and Photovoltaics
Institute of Process Engineering
2019-2024
University of Chinese Academy of Sciences
2019-2024
Chinese Academy of Sciences
2021-2024
Tokyo Institute of Technology
2017-2019
Hanyang University
2014-2016
Hunan University of Arts and Science
2012-2016
Seoul Institute
2016
Government of the Republic of Korea
2016
Sichuan University
2012-2013
Abstract Low-cost anion exchange membrane fuel cells have been investigated as a promising alternative to proton for the last decade. The major barriers viability of are their unsatisfactory key components—anion ionomers and membranes. Here, we present series durable poly(fluorenyl aryl piperidinium) membranes where possess high OH − conductivity 208 mS cm −1 at 80 °C, low H 2 permeability, excellent mechanical properties (84.5 MPa TS), 2000 h ex-situ durability in 1 M NaOH while water vapor...
Aliphatic/alicyclic (Al)-containing polyimides (PIs), including fully-Al-PIs and partially-Al-PIs, are widely employed in electric, electronics, optical materials, other advanced material fields. Examples include high speed multiplayer printed wiring boards, alignment films for liquid-crystal displays, fuel cells, batteries, gas separation membranes, pervaporation biomedical applications, composites/hybrid materials. In the past decades, research has focused on synthesis molecular design of...
Polyimides with intrinsic microporosity were readily prepared by introducing Tröger's base (TB) into the polymer backbone via polymerization between imide-containing diamines and dimethoxymethane (DMM). Two reaction of 2,5-dimethyl-1,4-phenylenediamine (DPD) 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA). The resulting polyimides soluble in common organic solvents, had good mechanical properties, tensile strength range...
Novel random poly(benzoxazole-benzimidazole-imide) copolymers were synthesized via the poly(amic acid)s from reaction of 5-amino-2-(4-aminobenzene)benzoxazole (BOA) and 5-amino-2-(4-aminobenzene)benzimidazole (BIA) with 3,3′,4,4′-biphenyl tetracarboxylic dianhydride (BPDA). The corresponding homopolyimides also prepared for comparison. resulting polyimides characterized by different techniques to obtain their molecular packing properties. copolyimide films not only showed ordered arrangement...
The correlations between the molecular structures of four Tröger's base (TB)-based polyimides (PIs) and two non-TB containing analogues physical properties including thermal conductivity (λ) dielectric both at low high frequencies were investigated in detail. TB-based PI films exhibited constants (Dk = 2.25–2.80) 10 GHz. They possessed much lower λ values (0.035–0.145 W/mK) compared to commercial Kapton (0.240 W/mK). influences incorporating TB units into chain backbones on aggregation PIs...
Insufficient mechanical properties are one of the major obstacles for commercialization ultrahigh permeability thermally rearranged (TR) membranes in large-scale gas separation applications. The incorporation preformed benzoxazole/benzimidazole units into o-hydroxy copolyimide precursors, which themselves subsequently rearrange to form additional benzoxazole units, were prepared first time. Using commercially available monomers, mechanically tough from random and block TR...
A facile two-step synthesis to prepare copolyimides by Tröger's Base (TB) formation provides membranes for the first time with tunable gas transport and good mechanical thermal properties.
A facile approach to synthesize poly(benzoxazole-co-imide)s without thermal rearrangement at high temperature is proposed. Poly(benzoxazole-co-imide)s with improved mechanical and solution-processable properties were prepared through polycondensation of 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) three synthesized novel benzoxazole-containing diamines a commercial diamine. These had tensile strengths 110.3–122.0 MPa good elongation break 11.9–26.3%, stability glass transition...
This study proposes a molecular design and synthetic route to novel colorless, transparent polyimides that exhibit dual fluorescence/phosphorescence emission at long wavelengths applicable solar energy conversion. Partially alicyclic (Ac-PI-TBs) based on Tröger's base (TB) denoted as Ac-PI-TB-1, Ac-PI-TB-2, Ac-PI-TB-3 were synthesized by in situ TB formation. The resulting Ac-PI-TBs are readily soluble common organic solvents have good mechanical properties with tensile strengths of...
A diamine monomer 5-amino-2-(4-hydroxy-3-aminobenzene)-benzimidazole (OH-BIA) containing both benzimidazole and hydroxyl groups was synthesized through a facile two-step reaction polymerized with four commercially available dianhydrides to yield polyimides. The solubility, chain packing, mechanical performance, thermal stability, gas transport properties of the polyimides were investigated in detail. exhibited good excellent (tensile strengths ≥103.3 MPa), high stability glass-transition...
Two series of random sulfonated poly(benzothiazole-co-benzimidazole) polymers (sPBT-BI) with 70% and 60% degree sulfonation were evaluated as proton exchange membranes. sPBT was also prepared for a comparative study. The mechanical properties sPBT-BI greatly enhanced by incorporation benzimidazole (BI); sPBT-BI70-10 showed tensile strength 125 MPa elongation at break 38.9%, an increase 56.5% 145%, respectively, compared sPBT. solubility, dimensional stability, thermal properties, oxidative...
Improving the low-temperature performance of lithium–sulfur batteries is significant for future applications. Meanwhile, a low temperature often leads to sluggish charge transfer kinetics and energy output. Herein, we designed thick freestanding TiO2 nanoparticle-embedded three-dimensional carbon composite (TiO2@C@CSC) host with high directional channels, aiming at achieving high-performance battery. The carbon-coated nanoparticles (TiO2@C) are derived from polyimide-coated embedded in...
To ensure the stable performance and extended service life of high-integrity high-power electronic devices, it is imperative for dielectric materials to consistently exhibit a low constant (Dk) dissipation factor (Df) across wide temperature range. Here, we have undertaken synthesis two distinct polyimides (PIs), namely, 6FDA-GA 6FDA-GB, featuring varying biphenyl side groups. These selected groups been intentionally incorporated impede interchain stacking PI macromolecules enhance twist...
In this study, a novel diamine monomer (BTPA) containing benzocyclobutene (BCB) cross-linking site was synthesized, and two polyimides (PIs), PI-BCB-1 PI-BCB-2, were synthesized using BTPA with dianhydrides, 4,4′-(hexafluoroisopropyl) diphenyl anhydride (6FDA) 4,4′-(4,4-isopropylidenediphenoxy)bis(phthalic anhydride) (BPADA), respectively. The BCB-based PIs soluble in common organic solvents exhibited desirable toughness. behavior of the investigated nonisothermal differential scanning...