ACS Applied Engineering Materials
·
2024
·
IF 0
Yan Liao,Jian Li,Chenyi Wang,Qiang Ren
Poly(3,4-ethylenedioxythiophene):poly(sodium styrenesulfonate) (PEDOT:PSS) is widely used in many aspects due to its good electrical conductivity. However, the low solid content of the PEDOT:PSS aqueous dispersion hinders its further application. Aiming to address this problem, a kind of novel “long-armed” crosslinked microspheres (cPBA@PSS), with crosslinked poly(butyl acrylate) as the core and poly(sodium styrenesulfonate) as the “long arm”, is synthesized via reversible addition–fragmentation chain transfer (RAFT) soap-free emulsion polymerization. With the “long-armed” crosslinked microspheres as the template, poly(3,4-ethylenedioxythiophene):poly(butyl acrylate-co-sodium styrenesulfonate) (PEDOT:cPBA@PSS) with a high solid content and low viscosity is successfully fabricated. The structures of cPBA@PSS are confirmed by infrared spectroscopy and hydrogen nuclear magnetic resonance spectroscopy. A PEDOT:cPBA@PSS aqueous dispersion with a solid content as high as 25 wt % is obtained by using long-armed crosslinked microspheres as the template due to the reduction of the entanglement between macromolecules. The kinetic study shows that the solid content of the dispersion has little effect on the polymerization rate of 3,4-ethylenedioxythiophene (EDOT). However, the viscosity of PEDOT:cPBA@PSS aqueous dispersions increases with an increase in the solid content. A PEDOT:cPBA@PSS aqueous dispersion with a solid content of up to 25 wt % shows a viscosity of about 37 mPa·s. The effect of the solid content on the transparency of PEDOT:cPBA@PSS films is studied, and no significant impact on film transparency is observed. The transmittance of the films at 550 nm is over 80%. The conductivity of the PEDOT:cPBA@PSS film increases with an increase in the solid content of the dispersion. The PEDOT:cPBA@PSS aqueous dispersion with a solid content of 25 wt % shows a conductivity of 0.68 S/cm when the ratio of PEDOT to cPBA@PSS is 1:1. The conductivity of the PEDOT:cPBA@PSS film can also be enhanced by secondary doping of dimethyl sulfoxide (DMSO), and the conductivity of the PEDOT:cPBA@PSS film can be increased to about 3.82 S/cm. This study shows that the use of the long-armed crosslinked microsphere cPBA@PSS as a template is an effective method to fabricate PEDOT aqueous dispersions with a high solid content and low viscosity.
研究领域:
材料科学
·
高分子化学
·
电化学
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xiaoqian Li,Dechao Wang,Zhongjie He,Fangfang Su,Nan Zhang,Yangyang Xin,Hongni Wang,Xiaolu Tian,Yaping Zheng,Dongdong Yao,Mingtao Li
Porous liquids (PLs) as a novel class of materials combine the permanent porosity of microporous solids, the rapid mass transfer of liquids, and fluidity, thus exhibiting extraordinary promise for gas capture and separation. However, the practical application of PLs was severely restricted by their undesirable relative high viscosity and melting temperature. In this work, the symmetric dicationic ionic liquids [C 6 BIm 2 ][NTf 2 ] 2 was synthesized as a steric hindrance solvent to construct a type of low viscosity zeolitic imidazolate frameworks (ZIFs)-based PLs. Specifically, the ZIF-67-PLs-2 ( i.e. , ZIF-67 loading of 2.0% in PLs) presented a low viscosity with 543.4 mPa·S at 25 °C, which was about 20 times lower than that of type III PLs reported previously. Meanwhile, ZIF-67-PLs showed long-term stability even over 180 days and broke the fluidity limitation down to −64 °C, broadening the work conditions. Moreover, ZIF-67-PLs-10 ( i.e. , ZIF-67 loading of 10.0% in PLs) achieved 55 times CO 2 and 7 times toluene adsorption capacity more than those of the corresponding pure DILs, respectively. Remarkably, the fascinating features of ZIF-67-PLs including lower viscosity, wide liquid range and higher adsorption pave a new way for the optimal design of novel PLs towards gas uptake and separation.
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
HIGH PERFORMANCE POLYMERS
·
2020
·
IF 1.568
Hong Li,Hang Su,Letian Wang,Lingyu Sun,Jiping Yang
The difficult forming process and construction caused by high viscosity has been the main problem restricting the application of high-performance thermoplastic/epoxy blends. In this contribution, low viscous polyetherketone (PEK)/diglycidyl ether of bisphenol A epoxy resin (DGEBA) blends were prepared by mixing the ultrafine PEK powder and DGEBA monomer at ambient temperature. Rheological behaviour shows that complex viscosity of the undissolved blends containing 20 wt% PEK powder is two orders of magnitude lower than that of the dissolved one. Interestingly, diffusion and phase separation of PEK powder in the undissolved PEK/DGEBA/2-methylimidazole/dicyandiamide (M-DICY) blends are affected by the curing processes. Phase-inverted morphology was observed after curing at 120°C/1h + 160°C/0.5 h for the undissolved 20 wt% PEK/DGEBA/M-DICY blends which also exhibited outstanding tensile strength and lap shear strength both at 298 and 77 K. We believe this work should provide a new insight into the preparation of advanced thermoplastic/epoxy blends.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Ge Gao,Xiaoyi Gao,Bin Xu,Wufeng Jiang,Zhenghong Zhao,Fan Wu,Xiaoshan Li,Cong Luo,Liqi Zhang
The CO 2 phase change absorbents(CPCAs) formed by introducing phase-splitting agents have attracted increasing attention because of their great energy-saving potential. However, the volatilization problem of the phase-splitting agents and the high viscosity of the solution affect the application of CPCAs. In this work, a novel CPCAs based on 2-Methylpiperazine (2MPRZ)/H 2 O was established by introducing triethylene glycol monobutyl ether (TGBE) with a high boiling point as a phase-splitting agent, and the 2MPRZ/H 2 O/TGBE system exhibited low volatility and low viscosity. The CO 2 capture performance of the novel CPCAs with different ratios was investigated in this work. The best CO 2 absorption rate was achieved by 2.5 M 2MPRZ/H 2 O/TGBE. The viscosity of this system before and after the CO 2 absorption process was merely 7.68 mPa·s and 11.64 mPa·s, respectively, and no volatilization of the phase-splitting agent was observed simultaneously. A convenient and rapid titration method was employed to determine the distribution of the 2MPRZ products in the two phases, which showed that 98 % of the 2MPRZ products were located in the CO 2 -rich phase. In addition, the CO 2 -rich phase captured 99 % of the total CO 2 , indicating that this system has superior phase-splitting behaviors. The regeneration energy consumption of this biphasic absorbent was 2.59 GJ/t CO 2 , which was 32.6 % lower than that of traditional MEA. Furthermore, the salting-out effect was proved to be the cause of the phase-splitting behavior by 13 C NMR analysis.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 5
·2189-2197
·
IF 3.591
Yangyang Xin,Dechao Wang,Dongdong Yao,Hailong Ning,Xiaoqian Li,Xiaoqian Ju,Yichi Zhang,Zhiyuan Yang,Yahong Xu,Yaping Zheng
Porous liquids (PLs), a new class of materials with permanent pores and macroscopic flowing behaviors, have attracted much attention for CO2 capture. However, the preparation of PLs is always complicated, which is not suitable for the scale-up. Herein, we propose a rather simple and feasible strategy based on post-synthetic modification of pore generators and the like-dissolves-like principle to synthesize UiO-66-PLs with low-viscosity. To be specific, the metal–organic framework (MOF) UiO-66 with hydroxyl groups (denoted UiO-66-OH) was modified by an organosilane (denoted KH550 or SID) via a post-synthetic modification method, obtaining the pore generator UiO-66-OS (denoted UiO-66-KH550 or UiO-66-SID). Then, the UiO-66-OS was dispersed into two different sterically hindered polydimethylsiloxane solvents (PDMS400 or PDMS6000). Thereby, a series of type 3 PLs (UiO-66-PLs) with superior fluidity at room temperature and accessible porosity were obtained. For instance, the viscosities of UiO-66-KH550-PDMS400 and UiO-66-SID-PDMS400 were 1.1 and 1.5 Pa S at 25 °C, respectively, which were far lower than those of values reported thus far. In addition, gas sorption–desorption measurements indicated that the UiO-66-PLs exhibit superior CO2 sorption performance and great potential for CO2/N2 separation. Moreover, molecular simulation was carried out to verify the retained accessible porosity. Notably, the strategy of constructing type 3 PLs based on the post-synthetic modification of MOFs with organosilane and the like-dissolves-like principle not only provides a new solution for the development of low-viscosity PLs, but also opens a new path for the construction of other types of advanced porous material (APM)-based (e.g., covalent organic frameworks (COFs), porous organic cages (POCs)) PLs, which have potential applications in the fields of gas trapping storage, and catalysis.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Chunlin Ren,Peixin Niu,Shihu Zhang,Xiaonan Han,Zhiqiang Guo,Yujin Zhang,Saisai Zhang,Xingjiang Liu,Liuhe Wei
Silane-modified polyurethanes (SPU-MDI, SPU-IPDI, and SPU-HDI) were synthesized by reacting various isocyanates (MDI, IPDI, and HDI) with poly(ether triol), followed by siloxane capping. The branched structures and properties of these SPUs were systematically characterized and evaluated. These SPU resins, upon moisture curing, yield elastomers exhibiting excellent mechanical properties and high transmittance (>92%). Incorporating polyether tertiary alcohol into the polymer chain markedly reduces the viscosity and average particle size of the SPUs due to its de-entangling effect. Specifically, the SPU-HDI resin displayed a low viscosity of 2548 mPa·s at 25 °C and an average particle size of 3.12 nm. Notably, elastomers derived from SPU-MDI and SPU-IPDI resins demonstrated tensile strengths greater than 10 MPa, surpassing that of SPU-HDI-based elastomer (∼5.0 MPa). This significant enhancement broadens the potential applications of these materials.
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
Journal of Coatings Technology and Research
·
2023
·Vol. 21
·期 3
·907-923
·
IF 2.3
Lou Kunpeng,Li Siliang,Cao Yang,Li Menghang,Zou Xiaoxuan,Jing Bo
In this paper, waterborne polyurethane (WPU-SL) with high solid content and low viscosity was successfully prepared by compounding large particle size emulsion (WPU-L) with a variety of small particle size emulsions (WPU-S) by investigating the effects of small particle size type, particle size ratio, and volume ratio on the emulsion properties. A series of characterization techniques of the waterborne polyurethane was carried out by FTIR, DSC, contact angle, viscometer, particle size meter, and universal testing machine. The results show that the WPU-L/WPU-S = 5/1 emulsion has a high solid content, good emulsion stability, and excellent coating film properties. When WPU-S 1 and WPU-S 3 , two small particle size emulsions with a particle size ratio of 2.45 and 3.79, were emulsified with WPU-L, the solid content was up to 61.23%, the viscosity was only 342 mPa s, the tensile strength reached 20.97 MPa, and the adhesion grade was 5B, which was the most excellent overall performance, showing satisfactory results. Graphical
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Ke Li,Hao Fang,Xiuzhi Duan,Dongshun Deng
Development of high-efficient solvents for NH 3 capture to improve the quality of atmosphere and ecological environment is a hot research topic. Deep eutectic solvents (DESs) as NH 3 absorbents can overcome some problems troubling the traditional NH 3 capture process. In this work, NH 4 SCN was paired with imidazole (Im) DESs to form low viscous DESs with dual active sites for highly efficient NH 3 absorption. The effects of absorption temperature, gas flow rate, water content, molar ratio on NH 3 absorption performance as well as physical properties of NH 4 SCN/Im DESs were systematically investigated. The results show that NH 4 SCN/Im DESs can rapidly capture NH 3 with good recycling performance, while the gas flow rate only shortens the absorption time. The NH 3 absorption capacity of NH 4 SCN/Im DESs decreased with increasing temperature and NH 4 SCN/Im molar ratio. The absorption capacity of NH 4 SCN/Im (1:2) DES reaches 9.65 mol NH 3 /kg DESs for atmospheric NH 3 . Based on 1 H NMR and IR spectroscopy analysis, the strong hydrogen bond between protic ammonium cation and NH 3 plays the major essence of efficient NH 3 capture for NH 4 SCN/Im DESs.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Reaction Chemistry & Engineering
·
2024
·Vol. 10
·期 1
·203-213
·
IF 3.4
Ning Ma,Liu Yang,Zhenchang Fang,Kaijia Jiang,Xinling Li,Zhen Huang
Deficiencies such as high viscosity, volatility, and rich phase precipitation limited the engineering application of non-aqueous absorbents. A series of high boiling point solvent screening experiments were conducted to develop an absorption saturated solution with a homogeneous phase at low viscosity (14.71 mPa s) in this study. Further addition of polyamines increased the absorption capacity by 42% (3.55 mol CO2 per kg). The 13C NMR results indicated that in the DETA/MEA/NMF blended amine system, MEA was involved in the deprotonation process of DETA zwitterions as proton acceptors. Quantum chemical calculations were utilized to compare the energies of each possible single-step reaction, providing insights into the reaction pathways of the blended amine system. The rate constant of the MEA/CO2 reaction was found to be 1.98 times that of the DETA/CO2 reaction, indicating lower reaction activity, consistent with NMR results. In addition, the results of the analysis of weak interactions revealed that the hydrogen bonds were key factors affecting the viscosity change and precipitation in non-aqueous absorbents, providing a new method for designing novel low-viscosity non-aqueous absorbents. The combination of theoretical analysis and experimental results underscores the potential of the blended amine non-aqueous absorbent as a feasible alternative for the industrial applications of CO2 capture.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2013
·Vol. 7
·期 2
·555-562
·
IF 7.475
Songqi Ma,Xiaoqing Liu,Libo Fan,Yanhua Jiang,Lijun Cao,Zhaobin Tang,Jin Zhu
Graphical An epoxy on both your houses! A trifunctional bio-based epoxy resin (denoted TEIA) is synthesized from itaconic acid. Its curing reaction with poly(propylene glycol) bis(2-aminopropyl ether) (D230) and methyl hexahydrophthalic anhydride (MHHPA) is investigated. As a result of high epoxy value and low viscosity, TEIA shows high performance and good processability. A bio-based epoxy resin (denoted TEIA) with high epoxy value (1.16) and low viscosity (0.92 Pa s, 25 °C) was synthesized from itaconic acid and its chemical structure was confirmed by 1 H NMR and 13 C NMR spectroscopy. Its curing reaction with poly(propylene glycol) bis(2-aminopropyl ether) (D230) and methyl hexahydrophthalic anhydride (MHHPA) was investigated. For comparison, the commonly used diglycidyl ether of bisphenol A (DGEBA) was also cured with the same curing agents. The results demonstrated that TEIA showed higher curing reactivity towards D230/MHHPA and lower viscosity compared with DGEBA, resulting in the better processability. Owing to its high epoxy value and unique structure, comparable or better glass transition temperature as well as mechanical properties could be obtained for the TEIA-based network relative to the DGEBA-based network. The results indicated that itaconic acid is a promising renewable feedstock for the synthesis of bio-based epoxy resin with high performance.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY
·
2022
·
IF 8.857
Xiaobin Zhou,Chao Liu,Yinming Fan,Lihao Zhang,Shen Tang,Shengpeng Mo,Yinian Zhu,Zongqiang Zhu
Biphasic solvents have been widely studied for CO 2 capture due to their remarkable energy-saving potentiality. However, most existing biphasic solvents suffer from the high viscosity of their CO 2 -rich phase. This study proposed a novel low-viscous secondary amine-based nonaqueous biphasic solvent for CO 2 capture. With dimethyl sulfoxide (DMSO) as the organic diluent and pentamethyldiethylenetriamine (PMDETA) as the phase splitting agent, the secondary amine of 2-methyl-ethynolamine (MAE) was proved to be the optimal candidate for preparing the biphasic solvent. The MAE/DMSO/PMDETA (M/D/P) biphasic solvent could realize a high CO 2 loading of 0.84 mol mol −1 and the viscosity of its CO 2 -rich phase was only 8.87 mPa s, which was significantly lower than that of most reported biphasic solvents. The reaction mechanism analysis revealed that M/D/P absorbed CO 2 to form products of protonated amines, carbamate, and carbamic acid species. Since the products were polar and showed a stronger affinity to polar DMSO, while less polar PMDETA was isolated, thereby resulting in a phase change. Thermodynamics analysis showed that the M/D/P biphasic solvent could sharply cut down the sensible heat and latent heat during CO 2 desorption. Eventually, the total regeneration energy penalty of M/D/P was significantly reduced by 46.3% compared with the benchmark aqueous MEA solution.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Korean Ceramic Society
·
2023
·Vol. 60
·期 3
·581-590
·
IF 2.5
Zhang Xu,Zhang Jingde,Tian Yuhang,Xiao Shikang,Li Jianzhang,Han Guifang
Slurries with high solid content and low viscosity are highly necessary to lower the sintering shrinkage and avoid possible defects for ceramic components fabricated by vat photopolymerization technique. However, the viscosity of slurry dramatically arises with the increase of solid content, which severely affects the printing process and the quality of preformance. To solve this issue, a novel combined strategy of powder surface modification and selection of dispersant was proposed to significantly increase the solid load without too much increase in viscosity. The surface of Al 2 O 3 particles was modified by Silane A174 to improve its wettability with resins, and then the use of KOS 110 formed steric hindrance between particles achieving good dispersion. The synergistic effect of the modifier and dispersant was realized. Al 2 O 3 slurry with a high solid loading up to 65 vol% and low viscosity of 20.0 Pa·s at 30 s −1 was prepared for stereolithography-based DLP 3D printing, which had among the highest performance in photosensitive Al 2 O 3 slurries.
研究领域:
材料科学
·
3D打印技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）