JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 59
·期 6
·510-518
·
IF 0
Guangtao Qian,Fengna Dai,Haiquan Chen,Mengxia Wang,Mengjie Hu,Chunhai Chen,Youhai Yu
Three novel diamines, incorporating benzimidazole and amide moieties, namely 4-amino-N-(5-amino-benzimidazol-2-yl)-benzamide (6a), 4-amino-N-(5-amino-1- methyl-benzimidazol-2-yl)-benzamide (6b), and 4-amino-N-(5-amino-1-phenyl -benzimidazol-2-yl)-benzamide (6c), were designed and synthesized. A series of poly(benzimidazole-amide-imide) (PBIAI) films were prepared from the resulting diamines and 4,4-biphthalic dianhydride (BPDA). These flexible polyimides (PIs) showed high glass transition temperatures ( T g = 353–379°C), low coefficients of thermal expansion (CTE = 3.7–12.3 ppm K −1 ) and good mechanical properties ( σ = 152–207 MPa and E = 4.5–7.7 GPa), promising candidates for applications in flexible-display substrates. Furthermore, the data guided a feasible method to enhance T g and reduce CTE by introducing benzimidazole and amide units into PI main chains, and the effect of different N-substituents on performance was revealed. Graphical
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DOI
POLYMER
·
2020
·
IF 4.231
Guangtao Qian,Haiquan Chen,Guangliang Song,Fengna Dai,Chunhai Chen,Jianan Yao
To achieve the superheat-resistant polymers for flexible display substrates, two new diamines, namely 6-amine-2-(4-aminobenzene)-1-methyl-benzimidazole ( m -MePABZ), 5-amine-2-(4-amino-benzene)-1-methyl-benzimidazole ( p -MePABZ) containing N-methyl benzimidazole (BI) were synthesized and a serials of poly(benzimidazole imide) (PBII) films were prepared through thermal imidization. Among them, the flexible polyimide (PI) film derived from m -MePABZ and pyromellitic dianhydride (PMDA) has an ultra-low coefficient of thermal expansion (CTE) down to 2.5 ppm K −1 and an outstanding high glass-transition temperature (T g ) up to 431 °C. Furthermore, the employment of N-methyl overcame an issue of the high H 2 O-absorption of traditional PBIIs, and the effect of “ para -” and “ meta- connecting” methyl on molecular packing and properties of these PIs was investigated. These data provided a useful guide to develop high performance PBIIs by incorporating N-methyl.
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DOI
高影响因子
POLYMER
·
2017
·
IF 3.684
Jiaqi Xiong,Zhi Wei,Tao Xu,Yang Zhang,Chuanxi Xiong,Lijie Dong
A novel polytriphenylamine derivative, poly(4-carbamoyl- N , N -diphenylaniline-2,2,5,5-tetramethyl-pyrrolin-1-oxyl) (PTPA-PO) has been synthesized and utilized for the fabrication of the cathode material for organic rechargeable batteries for the first time. The molecular structure, morphology, and electrochemical performance of the obtained polymers were characterized by Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible spectroscopy (UV–vis), scanning electron microscopy (SEM), cyclic voltammetry (CV), respectively. Additionally, the charge-discharge performance of the obtained polymers as cathode material were explored by galvanostatic charge-discharge tests. As a result, compared with PTPA, the as-prepared polymer presented an enhanced discharge capacity of 134.5 mAh·g −1 with two well-defined plateaus. Besides, the PTPA-PO, as the cathode material, exhibited an improved rate performance and remained above 90% of the initial capacity over 100 cycles. These outstanding electrochemical performances were attributed to the combination of the conducting polymer PTPA and the radical pendant PO together with the novel linear molecular structure, which not only provided a two-electron redox process , but also enhanced the charge carrier transportation along the polymer chain.
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DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2015
·
IF 4.494
Jiexun Huang,Guojing Ning,Feili Li,G. Daniel Sheng
Anaerobic transformation of 2,4-DNT by obligate marine Shewanella marisflavi EP1 was investigated. The cell growth of EP1 was proportional to the total amount of 2,4-DNT reduced. The eventual transformation product was 2,4-diaminotoluene, via 2-amino-4-nitrotoluene and 4-amino-2-nitrotoluene as intermediates. The presence of Cu 2+ , dicumarol, metyrapone and flavins intensively influenced the reduction activity of 2,4-DNT, suggesting that dehydrogenease, menaquinone, cytochromes and flavins are essentially involved in electron transport process for 2,4-DNT reduction. These results indicate that biotransformation of 2,4-DNT by EP1 is a form of microbial anaerobic respiration. Furthermore, EP1 was capable of transforming 2,4-DNT at relatively alkaline range of pH (7–9), and at a wide range of temperature (4–40 °C) and salinity (2–8% NaCl concentration). Our findings not only deepen our understanding of the environmental fate of 2,4-DNT, but also provide an extension to the application of shewanellae in the site bioremediation and/or wastewater treatment.
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）