JOURNAL OF MEMBRANE SCIENCE
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2021
·
IF 8.742
Zhili Cai,Yitao Liu,Can Wang,Wei Xie,Yang Jiao,Linglong Shan,Peiyuan Gao,Haitao Wang,Shuangjiang Luo
Polymers of intrinsic microporosity have attracted comprehensive attention in membrane-mediated gas separation because of their rigid and contorted structure that facilitates well-defined microporosity for fast and selective gas transport. We report a new macromolecular design synthesizes semi-ladder and fully-ladder polymers of intrinsic microporosity containing 9H -xanthene units by superacid-catalyzed Friedel-Crafts polymerization named SACPs. The prepared SACP membranes display high microporosity with amorphous chain packing structure, high FFV, and high BET surfaces areas. In particular, SACP-3 exhibited the most elevated BET surfaces area of 568 m 2 /g, fractional free volume (FFV) of 0.243, and bimodal micropore size distribution with two maxima at ∼5 and ∼8 Å, respectively. Due to its fully ladder architecture, SACP-3 exhibits highly permeable gas transport with CO 2 permeability of 6497 Barrer and CO 2 /CH 4 selectivity of 7.8, respectively. The microporosity and gas permeation properties of SACP membranes are also demonstrated to be highly tailorable by employing different monomers . The facile polymerization procedure, excellent solubility and processability, highly diverse tunability, and outstanding gas separation performance render SACP membranes attractive for many membrane-mediated gas separation processes.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 3
·270
·
IF 4.501
Wenqian Kang,Sheng Chen,Xiong Wang,Guangquan Li,Xiaoyu Han,Minfeng Da
Porous organic polymers (POPs) are widely used in various areas such as adsorption, separation and catalysis. In the present work, ionic liquid-modified porous organic polymers (IL-POPs) synthesized by dispersion polymerization were applied to immobilize metallocene catalysts for olefin polymerization. The prepared IL-POPs were characterized by Fourier transform infrared spectrometer (FT-IR), nitrogen sorption porosimetry, X-ray photoelectron spectroscopy (XPS), thermal gravimetric analysis (TGA), inductively coupled plasma atomic emission spectrometer (ICP) and scanning electron microscope (SEM) analysis. The IL-POPs obtained pores with surface specific area (SSA) ranging from 16.9 m2/g to 561.8 m2/g, and total pore volume (TPV) ranging from 0.08 cm3/g to 0.71 cm3/g. The supported catalysts Zr/MAO@IL-POPs exhibit great activity (3700 kg PE/mol·Zr·bar·h) in ethylene polymerization, and the GPC-IR results show that the polyethylene has narrow molecular weight distribution (2.2 to 2.8). The DSC results show that the melting point of prepared polyethylene was as high as 138 °C, and the TREF analysis results indicate that they have similar chemical composition distribution with elution temperature at 100.5–100.7 °C.Keywords:ionic liquid;porous organic polymer (POP);metallocene catalyst;ethylene polymerization;heterogeneous polymerization
研究领域:
材料科学
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化学工程
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高分子科学
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DOI
高影响因子
EUROPEAN POLYMER JOURNAL
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2021
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IF 4.598
Suyan He,Li Xiao,Luminita Marin,Yike Bai,Xinjian Cheng
The development of water-soluble polymer dyes is of great practical and scientific significance. In this article, small fluorescent molecule boron-dipyrromethene (BODIPY) bearing C=C bond was synthesized first. And then, via Suzuki reaction, recognition groups were introduced into the 2, 6 positions of BODIPY. Thus polymerizable fluorescent monomers were prepared. Finally, methacrylic acid (MAA) was copolymerized with the as-prepared small molecular fluorescent monomers via reversible addition-fragmentation chain transfer (RAFT) polymerization methodology. Four fully-water-soluble polymer sensors with BODIPY moieties in the end of the polymer chain were obtained eventually. In the presence of long PMAA chain, and by the assistance of it, BODIPY could be dissolved totally in water. These polymer sensors exhibited sensitive and selective recognition ability to Fe 3+ . Even the content rate of BODIPY was as low as 0.5% of the polymer (calculated from element analysis), the detection limit could reach 1.2 μM. The sensors with two recognition groups in one BODIPY unit were more sensitive than that with one recognition groups in each BODIPY unit. The sensing mechanism was investigated as well. By endowing the water solubility to organic sensors, the application scope could be greatly enlarged in sensing metal ions in aqueous environments. This work provides a method to develop water soluble high performance polymer sensors.
研究领域:
材料科学
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化学传感器
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分析化学
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DOI
高影响因子
Biomimetics
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2022
·Vol. 7
·期 2
·50
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IF 3.743
Xutao Ma,Xiaohui Fu,Jing Sun
As awareness of environmental protection increases, environmentally friendly coatings have been receiving great interest. Zwitterionic polymers are considered promising candidates due to their biocompatibility and excellent antifouling properties. In this paper, a type of polypeptoid containing zwitterions on the side chain was synthesized via ring-opening polymerization (ROP) and post-modification. This obtained polypeptoid was subsequently grafted onto the surface of polydimethylsiloxane (PDMS) via plasma and UV-induced surface polymerization. Surface morphology and protein adsorption tests of the resulting coating were systematically carried out. The results show that the modified coating has excellent antifouling properties and thus has great potential for environmentally friendly coating applications.Keywords:zwitterionic polymers;antifouling coatings;ring-opening polymerization
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
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2023
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IF 5.1
Siyuan Yu,Yanting Zhou,Chunyue Zhao,Han Liu,Zhiyun Xue,Jinfeng Xing
Dispersion photopolymerization was carried out under green LED irradiation to rapidly prepare monodisperse poly(methyl methacrylate) (PMMA) microspheres with small size by using a high-efficient three-component initiating system. The polymerization parameters including exposure time, MMA content, stirring speed, water ratio and PVP content were systematically investigated. Crucial parameters were further optimized by response surface method (RSM), and a corresponding polymerization mechanism was proposed. Finally, PMMA microspheres with 375.6 nm of size and 0.101 of PDI were prepared. This study provides a facile method for the rapid fabrication of PMMA microspheres.
研究领域:
材料科学
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高分子化学
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纳米技术
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DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
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2019
·Vol. 33
·期 5
·e4890
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IF 3.259
Farah Naz,Bibimaryam Mousavi,Zhixiong Luo,Christia Jabbour,Philippe M. Heynderickx,Somboon Chaemchuen,Francis Verpoort
A series of spray dried zeolitic imidazolate frameworks (ZIFs = ZIF-8, ZIF-67, and Zn/Co-ZIF) are used as a catalyst for the bulk ring-opening polymerization of δ-valerolactone without any co-catalyst to generate polyvalerolactone. Interestingly, using the same catalyst under the same reaction conditions could manipulate the structure of the product polymer, and thus its physical properties. Thus, using a dried substrate leads to the formation of the cyclic polymer while a linear polymer was formed on using the commercially available substrate. An activated monomer mechanism has been suggested where the propagating zinc alkoxide undergoes an intramolecular transesterification to release cyclic or linear polyvalerolactone. The ROP of δ-VL without drying shows that the polymeric zwitterions have little tendency to cyclize in the presence of moisture. At 140 °C, ZIF-8 shows a superior catalytic activity resulting in the production of cyclic polyvalerolactone having a high molecular weight as compared to ZIF-67 or Zn/Co-ZIF due to the presence of highly active sites. The catalyst could be recycled and reused without any significant loss of catalytic activity.
研究领域:
高分子化学
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材料科学
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催化化学
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生物可降解材料
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DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
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2013
·Vol. 31
·期 3
·393-400
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IF 0.917
Anna Zheng,Bo Chen,Dihang Hu,Yong Guan,Dafu Wei,Shuzhao Li,Dandan Ji
This work confirms the new view of the initiation and propagation mechanism of the anionic polymerization previously proposed, based on the investigation of anionic bulk-polymerization of styrene and α -methyl styrene with the help of a self designed microflow device and characterized by GPC and in situ 7 Li NMR. It was found that n -BuLi tended to form the hexameric-aggregated structure and even to form the huge aggregated structure based on the former. These aggregations of initiators could directly initiate the anionic polymerization and form the supramolecule aggregations. The supramolecule aggregations inevitably blocked the diffusion of the monomers to the ion-pairs and resulted in a stationary-conversion platform. Then the aggregators were dissociated completely into equal binary-aggregated species, and the polymerization continued again rapidly before the termination. Tetrahydrofuran (THF) acted as the electron donator, which could push the electron cloud to Li cation and make the aggregated ring of the active species rather loosened and facilitated the monomer to insert in. Therefore, a little THF can greatly promote the anionic polymerization. However, further addition of THF might block the channel between the ion-pairs and decrease the propagation rate. It was also found that the aggregated structure of the active species during the anionic polymerization only depends on the initiator aggregations which were formed before the polymerization.
研究领域:
化学
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高分子科学
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DOI
高影响因子
Polymers
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2017
·Vol. 9
·期 12
·681
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IF 3.364
Jianbo Tan,Xueliang Li,Jun He,Qin Xu,Yuxuan Zhang,Xiaocong Dai,Liangliang Yu,Ruiming Zeng,Li Zhang
Herein, we report a photoinitiated reversible addition-fragmentation chain transfer (RAFT) dispersion copolymerization of methyl methacrylate (MMA) and methyl methacrylic (MAA) for the preparation of highly monodisperse carboxyl-functionalized polymeric microspheres. High rates of polymerization were observed, with more than 90% particle yields being achieved within 3 h of UV irradiation. Effects of reaction parameters (e.g., MAA concentration, RAFT agent concentration, photoinitiator concentration, and solvent composition) were studied in detail, and highly monodisperse polymeric microspheres were obtained in most cases. Finally, silver (Ag) composite microspheres were prepared by in situ reduction of AgNO3using the carboxyl-functionalized polymeric microspheres as the template. The obtained Ag composite microspheres were able to catalyze the reduction of methylene blue (MB) with NaBH4as a reductant.Keywords:carboxyl-functionalized microspheres;RAFT polymerization;photoinitiated dispersion polymerization
研究领域:
材料科学
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高分子化学
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产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
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2021
·
IF 4.598
Suyan He,Luminita Marin,Xinjian Cheng
Fe 3+ and Fe 2+ are common metal ions in natural water environments and creatures. The development of water-soluble fluorescent sensors for detecting Fe 2+ /Fe 3+ ions was of great significance. In this work, two kinds of boron fluoride dipyrrole (BODIPY) fluorescent small-molecules were synthesized firstly. One of the small molecules contains a thioester bond that can be used as a chain transfer agent to participate in the polymerization process, and the other contains an unsaturated C = C double bond at the meso position. Through the reversible addition-fragmentation chain transfer polymerization (RAFT) polymerization method, methacrylic acid (MAA) and methacrylamide (MAM) were used as the main monomers, and small molecular fluorescent monomers were introduced to the end of the main chain. In this way, fluorescent macromolecules were obtained. The polymers were water soluble owing to the presence of long enough hydrophilic carboxyl and amide chains. These fluorescent probes exhibit high sensitivity to Fe 2+ /Fe 3+ , good selectivity, and anti-interference of other ions. The detection limit for Fe 2+ was as low as 2.3 × 10 −7 M, and the detection limit for Fe 3+ can reach up to 4.5 × 10 −7 M. The results show that these probes can be used as good sensors to identify Fe 2+ and Fe 3+ . Moreover, the fluorophores could be incorporated into polymer chains as the RAFT reagents and/or functional monomers.
研究领域:
化学
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材料科学
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产品关联
DOI
高影响因子
POLYMER
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2022
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IF 4.432
Yu-Lin Hong,Jian Sun,Hong-Wei Yang,Chang Wang,Yun Liu,Zhi-Wei Tan,Cheng-Mei Liu
Nitrile-rich polymers have found applications in carbon fibre, functional materials and rubber industry, though nitrile-rich polyelectrolytes have seldom been reported before. Here we present a nitrile-rich reactive phosphonium-based polyelectrolyte (PVBzTCPC) synthesized by the RAFT polymerization of 4-vinylbenzyl-tris(2-cyanoethyl)phosphonium chloride (VBzTCPC), a CN-rich phosphonium monomer prepared from tris(2-cyanoethyl)phosphine (TCP) and 4-vinylbenzyl chloride. The RAFT polymerization behaviour of the monomer was studied and it was found that the polymerization of monomer proceeded in a controlled/living manner. PVBzTCPC underwent the Wittig reaction and vinyl groups were introduced into the polymer chain as polymerizable pendant groups. Post-polymerization modifications of PVBzTCPC through the nitrile group proceeded successfully and the modified polymers were also phosphonium-based polyelectrolytes. PVBzTCPC showed a high tendency to form an undissolved polyelectrolyte complex with sodium perfluorooctanoate in aqueous solution, which provided a possible way of removing this persistent organic pollutant from water. The DMF solution of CN-rich PVBzTCPC showed LCST-type (lower critical solution temperature) phase transition without adding any foreign salts over 100 °C, and a possible mechanism of LCST transition was proposed.
研究领域:
材料科学
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化学工程
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环境科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2019
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IF 8.456
Xinlong Pang,Ying Tan,Chunyan Tan,Wenlu Li,Nan Du,Yunpeng Lu,Yuyang Jiang
Direct arylation polymerization (DARP) is a novel approach to obtain conjugated polymers (CPs) through the straightforward C–H activation of monomer building blocks. In this work, a convenient DARP method with high efficiency and excellent regioselectivity is developed to synthesize a series of donor–acceptor (D–A)-type CPs composed of electron-acceptor moiety fluorenones (FOs) and various electron-donor moieties. CPs with different band gaps are obtained in good yields and display large Stokes shifts up to 295 nm. Two ionic CPs, PFOP-NEt3(+) and PFOP-COO(−), were prepared in a polar solvent system to improve the water solubility and biocompatibility using the proposed DARP method. Detailed photophysical studies of these two CPs suggest that both solvation and hydrogen bonds play important roles in determining the polymers’ spectroscopic properties. Further studies of the cationic polymer PFOP-NEt3(+) in cell imaging demonstrate its potential application in labeling cell membranes and lysosomes given its low cytotoxicity, excellent photostability, and specific subcellular localization.
研究领域:
材料科学
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生物医学工程
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高分子化学
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DOI
高影响因子
Polymer Chemistry
·
2013
·Vol. 5
·期 7
·2326-2332
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IF 5.231
Jiawei Lu,Weidong Zhang,Sarah-Jane Richards,Matthew I. Gibson,Gaojian Chen
Side-chain functionalized glycopolymers have been successfully prepared in a well-controlled manner via a copper(0)-catalyzed one-pot reaction combining living radical polymerisation and ‘click chemistry’. The polymerisation was confirmed by the first-order kinetic plots, the linear relationships between molecular weights and the monomer conversions while keeping relatively narrow polydispersity (<1.33). The click conversion and polymerisation conversion versus reaction time plots for a Cu(0)-catalyzed one-pot reaction elucidate that the rates of click reaction are significantly faster than the polymerisation rates. Modified gold nanorods (GNRs) with glycopolymeric coatings were prepared through the interaction of Au–S bonds and the glycopolymer substituted GNRs showed strong, specific molecular recognition abilities with lectin (PNA).
研究领域:
材料科学
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生物医学工程
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化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）