POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 1
·e6277
·
IF 3.1
Anqi Ming,Xiaoxiao Li,Jun Sun,Yanyan Liu,Xingyou Tian,Hua Wang,Lin Chen,Yuxiang Cao,Yun Yuan
The cationic water-soluble polymers, which are widely used in many areas such as papermaking and separation process, are typically synthesized through polymerization of cationic monomers represented by quaternary ammonium salt. In this work, the polymerization reaction kinetics of three typical quaternary ammonium salt cationic monomers including acryloyl oxygen ethyl trimethyl ammonium chloride (DAC), methyl acryloyl oxygen ethyl trimethyl ammonium chloride (DMC), and methyl acrylamide propyl trimethyl ammonium chloride (MAPTAC) was examined by using the dilatometer method. The results showed that the polymerization rate of all three monomers increased with the increase of initiation temperature, monomer concentration, and initiator concentration. Under the same conditions, the polymerization activity of the three monomers followed the order: DAC > DMC > MAPTAC. The activation energies for the polymerization reaction under the specified conditions were E aDAC = 138.97 kJ/mol, E aDMC = 141.24 kJ/mol, and E aMAPTAC = 226.97 kJ/mol, respectively. The polymerization rate equations were R pDAC = k 1 [ M ] 4.25 [ I ] 0.51 , R pDMC = k 2 [ M ] 3.77 [ I ] 0.50 , and R pMAPTAC = k 3 [ M ] 3.30 [ I ] 0.49 . The polymerization activity of the monomers may be influenced by electronic effects and steric hindrance of the monomer structure. This work has provided a theoretical and experimental foundation for the actual work of structural design and preparation of cationic water-soluble polymers.
研究领域:
高分子化学
·
材料科学
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产品关联
DOI
高影响因子
Bioresource Technology Reports
·
2020
·
IF 0
Kai Sun,Qingyin Li,Lijun Zhang,Yuewen Shao,Zhanming Zhang,Shu Zhang,Qing Liu,Yi Wang,Xun Hu
Polymerization is one major issue during acid-catalyzed conversion of sugars/furans to platform chemicals. Reaction medium is one of the main factors impacting the tendencies of sugars/furans towards polymerization. In this study, conversion of sugars (fructose/glucose/xylose/xylan) and furans (hydroxymethylfurfural (HMF)/furfural/furfuryl alcohol (FA)) over a solid acidic resin catalyst in various water-organic bi-solvents (toluene, chloroform , n-butanol, tetrahydrofuran (THF), dimethyl sulfoxide (DMSO) and ethyl acetate (EA)) were investigated. The results showed toluene/chloroform as the co -solvent did not suppress the polymerization of fructose, HMF, furfural and FA while diminished the formation of LA from fructose/HMF. The organic co-solvents remarkably affected properties of the coke formed. The presence of aprotic organic solvents tended to retain the C O group in the coke formed and affected its thermal stabilities and evolution of the functionalities. Additionally, polymerization tendency of the furans with the distinct structures showed very different sensitivity with the water in reaction medium.
研究领域:
化学工程
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生物质转化
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催化反应
✓ 已验证
DOI
Polymers
·
2021
·Vol. 13
·期 4
·609
·
IF 4.329
Guifang Yang,Na Lin,Yuan Li,Xiaoxia Ye,Yifan Liu,Yuancai Lv,Chunxiang Lin,Minghua Liu
A novel cellulose–styrene copolymer adsorbent (cellulose-St) was prepared using free radical polymerization. Successful polymerization was confirmed through Fourier Transform Infrared Spectroscopy (FTIR), Carbon 13 Solid Nuclear Magnetic Resonance (13C NMR) Spectroscopy, Scanning Electron Microscopy (SEM), etc. Cellulose-St possessed good hydrophobicity, and the best water contact angle of cellulose-St samples could reach 146°. It had the ability of adsorption for nitrobenzene (NB), and the adsorption process could be well described by the pseudo-second-order (R2> 0.99) and three-stage intraparticle diffusion (R2> 0.99) kinetic models. Furthermore, the dynamic adsorption experiments revealed that cellulose-St had the potential for continuous separation of NB in water, and the breakthrough point for the initial NB concentration of 10 mg/L reached 1.275 L/g. Moreover, cellulose-St exhibited excellent environmental adaptability that it could maintain its hydrophobicity and adsorption ability for NB in strong acids, strong alkalis, or organic solvents. The used cellulose-St could be reused after washing with ethanol and keep almost constant adsorption capacity after ten cycles.Keywords:cellulose;styrene;hydrophobicity;nitrobenzene;polymerization
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
POLYMER
·
2018
·
IF 3.483
Ruiqi Li,Yudan Wang,Dan Zhou,Lijia Liu,Junqing Li,Yufa Li,Jijin Dai,Yushan Han
The polymerization of aniline (AN) was assisted with an oligomer that possessed two amino end groups ( 2AO ) in the presence of a single enantiomeric acid, (1 S )-(+)-10-camphorsulfonic acid (( S ) CSA). The reaction produced helical polyaniline (PANI) nanofibers with the opposite helical sense due to the concentration changes of ( S ) CSA in the polymerization system. The similar dependence of the circular dichroism (CD) signal on the ( S ) CSA concentration was also observed in the oxidization of the oligomer 2AO by ammonium persulfate (APS) in the presence of ( S ) CSA. In addition, under a certain ( S ) CSA concentration, the 2AO- assisted polymerization at low and high temperatures also produced the PANI fibers with the opposite helical sense. It is likely that these result from the different interaction modes of ( S ) CSA with the 2AO at different ( S ) CSA concentration. As a consequence, the oxidized 2AO (oligomer seeds) with different chirality in the early stage of the polymerization control the helicity of the resulting PANI nanofibers.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Food Science and Technology
·
2022
·
IF 2.602
WANG Lixia,DU Guorong,LIU Pei,WANG Xuehui,ZHAO Pengtao,ZHANG Qianting,LEI Xiaoqing,YUAN Huanhuan,CHEN Tongguo,WANG Xiaoyu
Since the grape skin and seed contain different phenolic substances, the proportion of the skin and seed will affect the wine mouthfeel during the wine making process. During the wine ageing, the interaction between flavanols with anthocyanins is an important reaction and considered linked to astringency. Hence, a major question is whether changing the skin-seed ratio will affect the polymerization of phenolic substances in wine, thus affecting the astringency of wine. To answer this, astringency of wine was studied by changing the content of grape skins and seeds by SDS-PAGE, fluorescence quenching and sensory taste. Besides, acetaldehyde-mediated condensation reaction between different flavan-3-ols and malvidin-3-glucoside were studied in model solution. The result showed that grape skins and seeds contribute differently to astringency sensation, mainly because of the difference in the type and content of flavanols and anthocyanins contained in them. In addition, acetaldehyde-induced flavan-3-ols: anthocyanin mixture presents a strong effect toward the interaction with BSA when compared to other phenolic combinations. Furthermore, it was observed that the protein-binding ability of the polyphenols in red wine has a strong correlation with the wine astringency intensity.
研究领域:
食品科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Jianyang Liu,Wei Wang,Zhipeng Mao,Lin Cao,Meiyan Yu,Shougang Chen
Metal corrosion and rusting have caused significant losses to humans, and environmentally friendly and efficient rust removal methods are receiving increasing attention. Here, we propose a method for rust removal by synthesizing acrylic gel on Q235 steel sheet using a photopolymerization reaction. The weak acidity of acrylic acid decomposes rust, and the gel formed by the reaction of acrylic acid with acrylamide has strong adsorption capacity, which effectively adsorbs rust molecules and metal ions. The introduced Cu 2 O enhances the rust removal system. Cu 2 O reacts with the acrylic acid monomer to form a monovalent copper complex, which can improve the rust removal efficiency during the process through redox reactions. The UV-induced copolymerization of acrylic monomers to form gel enables effective rust removal, with a rust removal rate as high as 85.94 g ·h –1 ·m –2 . This method avoids the use of strong acids commonly found in traditional rust removal methods, offering advantages such as environmental friendliness and low cost. The gel formed during the rust removal process can be easily and conveniently removed from the substrate surface, thus avoiding secondary pollution issues such as waste liquid disposal.
研究领域:
材料科学
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腐蚀与防护
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
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2025
·
IF 4
Yu Shi-Han,Wang Lu,Zhang Meng-Chao,Li Hong-Kun
Exploration of new green polymerization strategies for the construction of conjugated polymers is important but challengeable. In this work, a multicomponent polymerization of acetylarenes, alkynones and ammonium acetate for in situ construction of conjugated poly(triarylpyridine)s was developed. The polymerization reactions of diacetylarenes, aromatic dialkynones and NH 4 OAc were performed in dimethylsulfoxide (DMSO) under heating in the presence of potassium tert-butoxide ( t -BuOK), affording four conjugated poly(2,4,6-triarylpyridine)s (PTAPs) in satisfactory yields. The resulting PTAPs have good solubility in common organic solvents and high thermal stability with 5% weight loss temperatures reaching up to 460 °C. They are also electrochemically active. The PTAPs incorporating tetraphenylethene units manifest aggregation-induced emission features. Moreover, through simply being doped into poly(vinyl alcohol) (PVA) matrix, the polymer and model compound containing triphenylamine moieties exhibit room-temperature phosphorescence properties with ultralong lifetimes up to 696.2 ms and high quantum yields up to 28.7%. This work not only provides a facile green synthetic route for conjugated polymers but also offers new insights into the design of advanced materials with unique photophysical properties.
研究领域:
高分子化学
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材料科学
·
有机合成
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Libo Ba,Chen Chen,Rui Meng,Yuliang Chen,Yuliang Wu,Yijiang Liu,Weiwei Huang,Fei Yang,Jun Cheng,Xuesong Yi
High-efficiency polyamide nanofiltration membranes were recognized as crucial for alleviating freshwater scarcity. However, the rapid reaction rate between piperazine (PIP) and trimesoyl chloride (TMC) resulted in low membrane flux and suboptimal separation efficiency, which limited the application and development of membrane technology. Herein, a novel MOF-303@GO nanomaterials were prepared by in-situ growth method, which were anchored in the framework of the substrate membrane through a phase separation method to regulate the speed of interfacial polymerization reaction to improve the performance of composite nanofiltration membranes. The MOF-303@GO was found to exhibit an adsorption effect on PIP monomers for the accumulation of the PIP molecules around the MOF-303@GO in the membrane pore, which effectively slowed transfer rate of PIP. This process resulted in a thin PA layer and rough surface, which alleviated the resistance to water molecule transport during the membrane separation process. The adsorption mechanism between MOF-303@GO and PIP was profoundly demonstrated by density-functional theory calculations. Besides, the fabricated membrane demonstrated a good water permeability of 14.53 L·m −2 ·h −1 ·bar −1 , along as well as a high Na 2 SO 4 rejection of 96.56 %. This research provided a novel material to regulate the diffusion state of PIP molecules and introduced a key strategy for uniformly blending to modify the substrate membrane, offering a potential solution to the issue of excessively rapid IP reaction rates.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 3
·1705-1714
·
IF 3.809
Liu Ting,Ding Enyong,Xue Feng
Polymer grafting is an efficient way to obtain functional cellulose nanocrystals. In this work, we used a “macro-RAFT (macromolecular reversible addition–fragmentation chain transfer) agent-assisted” strategy, which adds extra amount of amphiphilic macro-RAFT agent with low molecular weight to graft poly(N,N-dimethylacrylamide) (PDMA) from cellulose nanocrystals. Successful grafting was evidenced by different characterization methods, and a high weight ratio of grafted PDMA was obtained (77.6%). The grafting process was studied through the weight ratio of grafted PDMA, monomer conversion, and the molecular weight of free and grafted PDMA at different reaction time. As a result, we have suggested that there were three types of grafted polymer chains on cellulose nanocrystals in this reaction system and discussed their evolution during the grafting reaction. Finally, we summarized several key factors for successful grafting in this macro-RAFT agent-assisted strategy.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2022
·
IF 4.177
Jun Han,Qunfei Zheng,Cheng Jin,Shanmin Wang,Ying Liu,Yusheng Zhao,Jinlong Zhu
The comparison of different stereoisomeric organic compounds under high pressure has been less investigated. Here, we chose different stereochemical configurations of cis/trans-stilbene to study the luminescence properties, polymerization reaction, and structural changes at 0–20 GPa by spectroscopy and XRD. No fluorescence enhancement occurred in cis-stilbene due to π–π stacking. At 16 GPa, the IR, UV–vis, and sample color changes show that it undergoes an irreversible polymerization, that C(sp2)–H changes to C(sp2 + sp3)–H. However, trans-stilbene undergoes fluorescence enhancement at 0–4 GPa due to the reduction of the torsion angle of the benzene ring and the C═C bond leading to the formation of rigid planar molecules, which is further confirmed by the IR and XRD results. At 8 GPa, the new peaks in UV–vis and XRD results show the formation of new substances by structural change. However, the structure of trans-stilbene is more stable, which leads to the return to the raw state after releasing the pressure, and a reversible transformation occurs at high pressure. The cis-trans isomerization under high pressure was also briefly investigated by combining heating and laser irradiation. The cis → trans-stilbene transition can only happen under a fixed-range light irradiation, and the trans → cis-stilbene transition could not happen even under irradiation with a 360 nm laser, which may provide a new idea for synthesizing trans isomers with a higher purity.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Zhichao Wang,Yu Hu,Jianhua Hu,Haitao Wang
One-pot aqueous-phase synthesis of polyimides (PIs) offers great economic and environmental benefits and improves the hydrolytic stability of the precursor (polyamic acid) obviously. However, this method is only suitable for the polymerization of very limited dianhydride and diamine monomers up to now. In this study, the most commonly used dianhydrides and diamines for the preparation of commercially available PI products were selected for one-pot aqueous-phase synthesis of various polyamic acid salts (PAAS). The effects of the structure of monomers, the reaction temperature and the adding process of the organic base on the polymerization reaction were explored by rotational rheology, nuclear magnetic resonance (NMR) and Fourier transform infrared (FTIR) spectroscopy. The polymerization products obtained via the aqueous-phase route show high molecular weight when the reaction conditions have been optimized. Various PI films prepared by the thermal imidization of corresponding PAAS demonstrate good optical transparency, excellent thermal stability, and outstanding mechanical and electrical properties. This work proposes the reaction mechanism of PAAS via one-pot aqueous-phase route and utilizes this novel polymerization strategy to synthesize high-molecular-weight PIs from typical aromatic dianhydride and diamine monomers.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Junjie Liu,Jianmin Wu,Qiwen Sun,Jiancheng Wang,Yan Sun
The high viscosity index poly-alpha-olefin was prepared by 1-decene polymerization under [EBIZrCl 2 /Al( i Bu) 3 /[Ph 3 C] + [B(C 6 F 5 ) 4 ] - system (EBI = rac-C 2 H 4 (1-Ind) 2 ), and its mechanism was investigated by in situ UV–Vis, 1 H NMR and ESI-MS. The results show that the kinematic viscosity at 100 °C (KV 100 ), viscosity index (VI) and yield of product reach to 336.3 cSt, 268 and 90.76 % under optimum reaction condition, wherein Zr/1-decene content, Al/Zr content, B/Zr content, reaction temperature and time are 10 −4 , 200, 2, 90 °C and 120 min, respectively. Meanwhile, temperature plays a crucial role in controlling the KV 100 and VI of product, with impact index of 55.43 % and 44.32 %, respectively. In situ UV–Vis, 1 H NMR, and ESI-MS analyses confirm the simultaneous generation of active (EBIZr-σ-polydecenyl cations) and inactive species (EBIZr-η 3 -(1-propyl-C 7 H 8 ) + ). The active and inactive species are generated through posing complexation to the terminal allyl of 1-decene and H 2 loss of EBIZr(u- i Bu) + , respectively. The second inactivate species (EBIZr-η 3 -(x-propyl-(3-x)-polydecenyl-C 3 H 3 ) + (x = 1 or 2)) can be activated by seizing isobutyl group in Al( i Bu) 3 . Subsequently, the polymer with an Al-capped saturated chain end is formed through chain migration. The polymerization process follows the reaction pathway: [1-decene]+[catalyst]→[active species]+[inactive species]. This is supported by the fact that all fitting curve of conversion versus time, 1-decene consumption and polymer generation conform to the Boltzmann (R 2 = 0.999). Based on those findings, a possible mechanism in ansa-zirconocene catalyzed polymerization of 1-decene is proposed.
研究领域:
高分子化学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）