POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 31
·期 10
·2239-2249
·
IF 2.578
Qiling Zong,Ailing Xu,Kun Chai,Yanhua Zhang,Yongming Song
Green and renewable foaming poly(lactic acid) (PLA) represents one of the promising developments in PLA materials. This study is the first to use the lignin graft PLA copolymer (LG-g-PLA) to improve the foamability of PLA as a biobased nucleating agent. This agent was synthesized via ring-opening polymerization of lignin and lactide. The effects of LG-g-PLA on cell nucleation induced by the crystallization, rheological behavior, and foamability of PLA were evaluated. Results indicated that LG-g-PLA can improve the crystallization rate and crystallinity of PLA, and play a significant nucleation role in the microcellular foam processing of PLA. LG-g-PLA improved the foam morphology of PLA, obtaining a reduced and uniform cell size as well as increased expansion ratio and cell density. With the addition of 3 wt% LG-g-PLA content, the PLA/LG-g-PLA foams increased the compressive strength 1.6 times than that of neat PLA foams. The improved foaming properties of PLA via a biobased nucleating agent show potential for the production and application of green biodegradable foams.
研究领域:
材料科学
·
生物工程
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DOI
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2018
·Vol. 21
·期 3
·303-312
·
IF 1.454
Zexia Fan,Zhiyu Deng,Tengfei Wang,Weipeng Yang,Kun Wang
Tea saponin (TS) is a relatively inexpensive natural nonionic surfactant extracted from parts of tea plants, which can be modified into an anionic surfactant to achieve better surface activity. In this paper, the synthesis of TS-based succinic acid sulfonate as an anionic foaming agent is described. TS used as the hydrophobic source was modified by maleic anhydride (MAH) and then reacted with sodium bisulfite. Orthogonal experiment of a 2-step reaction was designed and performed, resulting in 9 kinds of succinic acid tea-saponin sulfonate (STS). 4-Dimethylaminopyridine and tetrabutylammonium bromide were, respectively, used as catalyst for the esterification with MAH and the sulfonation with sodium bisulfite. During the synthesis process, N , N -dimethylformamide was employed as the solvent and ethyl acetate as the extractant. The molecular structure of STS was confirmed by infrared spectroscopy and mass spectrometry. The foaming property of STS was investigated through comparison with different kinds of common surfactants. The results show great prospects of these environmentally friendly anionic surfactants. Graphical
研究领域:
化学工程
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环境科学
·
材料科学
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2022
·Vol. 24
·期 14
·5490-5501
·
IF 11.034
Pengzhi Li,Bin Lan,Xutao Zhang,Siyuan Lei,Qi Yang,Pengjian Gong,Chul B. Park,Guangxian Li
As the most produced thermoplastic after polyolefins, an urgent issue for polyesters is to improve their environmentally friendliness in processing, application, and recycling. However, the performance of polyesters significantly deteriorates in the above stages. This work breaks through the difficulties when applying traditional polyesters by the green in situ construction of a novel covalent adaptable network, which has an ultrafast exchange reaction rate attributed to the synergistic catalytic effect of neighboring group participation (NGP) and the tertiary amine structure. This polyester-based vitrimer shows advanced performance in repairability (fast self-healing), foamability (matching fast CO2 diffusion) and recyclability (efficient reprocessing), due to the ultrafast exchange reaction rate in the system. The obtained vitrimer then possesses excellent self-healing behavior, as the damage was recovered within 32 min at 245 °C, possesses great foamability, as the foam prepared via green scCO2 foaming technology has a density as low as 0.039 g cm−3 and has a thermal conductivity as low as 28 mW/(m K)−1, and, meanwhile, possesses an advanced reprocessing ability without performance loss. Furthermore, the proposed strategy shortens the preparation time of the vitrimer to 3.5 min, providing a practical green method for the continuous process and industrial production of the polyester vitrimer via the synergistic catalytic effect of NGP and the tertiary amine structure, which is also constructive to the improved performance, environmentally friendly upcycling, and green application of the polyester vitrimer.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2024
·
IF 3.1
Liang Zhijie,Peng Jiayu,Xu Yang,Wang Haifeng
A series of carboxyl-modified polyether block silicone (CPES) surfactants were synthesized by the polymerization of 1,1,3,3-tetramethyldihydrodisiloxane, D4, allyl polyoxyethylene and sodium chloroacetate. The structures of the surfactants were characterized by IR and 1 H-NMR. Furthermore, the surface tension, wetting properties, foam properties, emulsifying properties and cleansing properties of the synthesized products were investigated. The results show that these compounds have high surface activity and good foaming stability. The wetting properties are general, but increasing temperature can improve the wetting ability of the product. Besides, CPES surfactants exhibit good emulsifying and cleaning ability.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Man Liu,Tong Song,Xuan Wu,Qian Li,Shiwei Wang
In this paper, the foamed polylactic acid (PLA) composites with different ratios of titanium dioxide (TiO 2 ) and lignin (Lg) are prepared. Molecular dynamics simulation analysis indicates that the fillers enhance the mechanical properties of the composites. The optimal foaming temperatures for PLA/Lg and PLA/TiO 2 composites are found to be 110 and 100°C, respectively. The supercritical carbon dioxide foaming process is applied to get the foamed composites, and their mechanical and thermal properties are analyzed. The results show that the addition of TiO 2 improves the melting point and compression properties of the PLA composites. Furthermore, the inclusion of Lg increases the molecular chain mobility, foaming multiplicity, and compression strength of the composite materials.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
TENSIDE SURFACTANTS DETERGENTS
·
2017
·Vol. 54
·期 2
·165-170
·
IF 0.869
Ruixia Niu,Jingling Wang,Wenyi Wang,Biao Long,Hua Song,Chao Wang,Daqiang Wang,Lingzhi Liao
Series of bi-component nonylphenol alkyl sulfonate surfactants (C 12 /C n -NPAS, n = 8, 10, 14, 16) were synthesized through sulfonation-alkylation-neutralization using a mixture of linear alpha olefin (C 12 -olefin and C n -olefin, n = 8, 10, 14, 16), SO 3 and nonylphenol as raw materials. The effect of the raw materials composition on the properties, such as surface tension, interfacial tension, wettability, foam properties of the prepared C 12 /C n -NPAS ( n = 8, 10, 14, 16) surfactants was systematically investigated. The critical micelle concentrations (CMC) of C 12 /C 8 -NPAS, C 12 /C 10 -NPAS, C 12 /C 14 -NPAS and C 12 /C 16 -NPAS are 0.42, 0.26, 0.22 and 0.40 mmol · L −1 , and surface tensions at CMC (γ CMC ) are 34.7, 27.9, 31.8 and 33.3 mN · m −1 , respectively. Compared with SDBS and HABS, the surface properties of the prepared C 12 /C n -NPAS are superior to traditional surfactants. Interfacial tension between Daqing crude oil and weakly alkaline ASP oil flooding system containing 0.1 wt% of C 12 /C 14 -NPAS could reach an ultralow level of 9.78 × 10 −3 mN · m −1 , which is lower than that for C 12 -NPAS and HABS. C 12 /C 10 -NPAS shows better wetting performance and foamability and foam stability than other synthesized surfactants.
研究领域:
化学工程
·
界面科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Xu Li,Chunsheng Pu,Xin Chen
Carbon nanotube (CNT) is one of promising materials for stabilizing foam. However, the aggregation of CNT seriously affects its foam-stabilizing performance. Herein, this study employed the ultrasonic waves to improve the dispersity of hydroxylated multiwalled carbon nanotube (HMCNT) in SDBS solution. The ultrasonic treatment can disentangle the HMCNT through cavitation and chip effects and the SDBS molecules adsorbed on the HMCNT may increase the electrostatic repulsion between nanotubes , leading to a good dispersion of HMCNT. Besides the conventional evaluations in bulk phase, this study developed a visualized cylinder filled with quartz glass beads to estimate the foam properties in porous media . Experimental results indicate that the novel SDBS/HMCNT foam has a good foaming and foam-stabilizing performance both in bulk solution and porous media. A series of analysis experiments have been conducted to reveal the foam-stabilizing mechnism of HMCNT, including the surface tension and dilational viscoelastic modulus measurements, and the optical microscope and fluorescence microscope observations. This study found that the SDBS-modified HMCNT can adsorb on the gas-liquid interface and gather around the bubbles. As a result, the dilational viscoelasticity and thickness of foam films increase, which help to slow down the gas diffusion rate and restrain the film drainage. Finally, the fractured-core flooding tests showed that the SDBS/HMCNT foam system can effectively plug the millimeter-sized cracks in low-permeability cores and have a good potential in enhanced oil recovery.
研究领域:
材料科学
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石油工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 11
·115302
·
IF 1.929
Furong Li,Qingqing Zhang,Shouzheng Jiao,Zhicheng Sun,Jinyue Wen,Xiaoyang Du,Ruping Liu,Luhai Li
Thermal expansion microcapsules (TEMs) are widely used in various fields due to their unique structures. In recent years, TEMs have attracted much attention and have broad market application prospects. In this study, thermally expandable microcapsules with a core–shell structure were prepared by suspension polymerization using acrylonitrile (AN), methyl methacrylate (MMA), and methyl acrylate (MA) as monomers and low-boiling alkane as the core material. Through particle size analysis, morphology test, thermal analysis and other methods, the effects of core material types, single core material and mixed core material, dispersion system on the microcapsule structure, particle size distribution, and expansion properties were compared. Moreover, the core material with a content of 35% can make the expansion ratio of the microcapsules up to 4 times. The expansion performance of the microcapsules with a mixture of isopentane and isooctane (ratio 1:1) as the core material was increased by 27% compared with that of a single core material. In addition, comparing with colloidal SO2/PVP dispersant, the expansion ratio of the microcapsules with magnesium hydroxide as the dispersant was increased by 20%. Finally, the optimized method for preparing thermally expandable microcapsules was obtained.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2022
·
IF 2.719
Hui Xu,Yan Chen,Nannan Liu,Xinglong Chen,Dan Wu,Binshan Ju,Minglu Shao
The foam instability is still a question to enhance oil recovery. In this work, the modification process of the SiO 2 nanoparticles by kH-570 was described and the models of SDS and SiO 2 nanoparticles at the gas–liquid interface established were aimed to verify the mechanism of SiO 2 nanoparticles on foam stability. The results showed that the foam performance of the hydrophilic SiO 2 /SDS dispersion was better than that of SiO 2 /SDS dispersion depending on desorption energy and maximum capillary pressure of SiO 2 nanoparticles at the gas–liquid interface. Finally, the oil recovery (45.25%) by using hydrophilic SiO 2 /SDS dispersion at 2.0% modified SiO 2 + 0.4% SDS.
研究领域:
石油工程
·
材料科学
✓ 已验证
DOI
高影响因子
ULTRASONICS SONOCHEMISTRY
·
2023
·
IF 8.4
Zhihui Yu,Li Ma,Binbin Liu,Wenqing Wang,Ziqi Shang,Huichao Dang,Chunyou Liu
Ovalbumin (OVA), characterized by its high concentration in eggs, possesses remarkable foaming properties. Nevertheless, OVA is highly sensitive to thermal changes and acid-base conditions, substantially hampering its application potential for foaming purposes within the food industry. This experiment aimed to examine the effects of preheating and high-intensity ultrasound (HIU) treatment at different powers on OVA foaming properties and explore the underlying mechanisms. The results revealed that OVA exhibited the highest foaming capacity (31.5 %) and foaming stability (96.7 %) under the treatment condition of 200w + 60°C. Additionally, significant improvements were observed in the content of free sulfhydryl groups (37.27 μmg/g), solution viscosity (142.33 mPa·s), and surface hydrophobicity (37.27 μg BPB) under this condition. The absolute value of the zeta potential (-10.28 mV) was significantly increased in the 200w + 60°C treatment group. Moreover, the polymer dispersity index of OVA (0.6045) was significantly reduced, resulting in improved dispersion than the control group. The structural analysis revealed significant changes in the α-helix and β-sheet content of OVA after treatment at 200w + 60 °C. The X-ray diffraction pattern exhibited sharper peaks, indicating a crystal structure, and the fluorescence peak displayed a slight blue shift along with increased hydrophobicity. Moreover, the preheating and HIU treatment induced a continuous uneven and irregular pore structure in OVA, which ultimately enhanced its foaming properties. In conclusion, the preheating and HIU treatment offers a novel approach to enhance the foaming properties of OVA.
研究领域:
食品科学
·
化学工程
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PETROLEUM CHEMISTRY
·
2021
·Vol. 61
·期 11
·1305-1318
·
IF 1.029
Zhu Wenxi,Zheng Xiuhua
Abstract Colloidal Gas Aphron (CGA) drilling fluid is one of the most promising
techniques in underbalanced drilling with excellent plugging and reservoir
protection functions. Due to the limitation of poor thermal stability of
commercial foaming agents used in oilfields, the research on high-temperature
resistant CGA drilling fluid is still a challenge. In this study, a
biodegradable glycine foaming agent AGS-12 was synthesized via a one-step
method. The surface activity, foaming performance (25–150°C) of AGS-12 and the
high temperature performance of AGS-12 based CGA drilling fluid (120–150°C) were
studied. All the results provide a basis for the potential application of AGS-12
as an eco-friendly foaming agent in high-temperature CGA drilling fluids: 1) The
product AGS-12 with 87% conversion rate was synthesized successfully by one-step
method, which can be verified by FT-IR. TGA analysis suggested that AGS-12 had
good thermal stability within 315°C. Moreover, AGS-12 is easily biodegradable
and fully meets the first level discharge standard of petrochemical industry
pollutants. 2) AGS-12 can reduce the surface tension of solvent water from 72.38
to 28.44 mN/m. Analysis of fundamental surface activity parameters illustrates
the higher surface activity of AGS-12, compared with a variety of amino acid
surfactants. 3) Waring-Blender test showed that foams generated by 3% AGS-12
always have higher half-life, foam quality and lower drainage speed than the
foaming agents available on market within 150°C. 4) At 120/140/150°C, aphrons
with diameter of 10–150 µm have been successfully generated in CGA drilling
fluid by using AGS-12 as foaming agent. Rheological and filtration tests
suggested that AGS-12 based CGA drilling fluid is a high-performance drilling
fluid with strong shear thinning behavior, high viscosity, and low filtration
invasion.
研究领域:
石油工程
·
环境科学
·
材料化学
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2019
·
IF 6.282
Xun Fan,Guangcheng Zhang,Jiantong Li,Zhengyang Shang,Hongming Zhang,Qiang Gao,Jianbin Qin,Xuetao Shi
The functional multi-walled carbon nanotubes (fMWCNTs) and liquid carboxy-terminated butadiene-acrylonitrile copolymer (CTBN) were incorporated into epoxy (EP) resin to fabricate thermosetting composites, which were foamed using supercritical carbon dioxide (SCCO 2 ). The foamability, electrical conductivity and electromagnetic interference (EMI) shielding effectiveness (SE) of foams were discussed. Owing to the heterogeneous nucleation caused by carbon nanotube, the average cell size of ∼400nm and cell density of ∼10 12 cells/cm −3 were obtained, resulting in the excellent foamability of EP-CTBN-fMWCNTs systems. The biaxial stretching during cell growing facilitates fMWCNTs to align, forming 2D conductive networks, and resulting in the improvement of electrical property. The composite foam with fMWCNTs content of 5.0 wt% possesses EMI SE of 22.90 dB and specific EMI SE of 37.54 dB/(g cm 3 ), which attributes to its high electrical conductivity of 0.43 S/m and cellular morphologies that made electromagnetic microwaves multi-reflect from one cell to another and then be attenuated by conductive filler.
研究领域:
材料科学
·
复合材料
·
电磁学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）