HOLZFORSCHUNG
·
2018
·Vol. 73
·期 5
·469-474
·
IF 2.079
Yaoge Huang,Gaiyun Li,Fuxiang Chu
Poplar wood samples (2×2×2 cm 3 ) were vacuum/pressure impregnated in alcoholic solution with 2-hydroxyethyl methacrylate (HEMA) and 3-(methacryloxy)propyltrimethoxysilane (MAPTES) in a mass ratio of 3/1 in the presence of catalytic amounts of azobisisobutyronitrile (AIBN). Because of their good solubility and permeability, the HEMA/MAPTES precursors evenly penetrate the poplar cell wall. The impregnated samples were heated at 75°C for 8 h, followed by a heating period at 103±2°C for 8 h, in the course of which an in situ polymerization occurred in the cell wall. The modified wood was characterized by Fourier transform infrared (FTIR) and Raman spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). Moreover, the dimensional stability of the modified wood was measured and found to be considerably improved.
研究领域:
材料科学
·
木材科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 27
·11704-11709
·
IF 3.288
Chao Fan,Hao Tang,Licheng Wang,Yijing Li,Xusheng Wang,Shuai Wang,Xiaojing Liang
Using N-isopropylacrylamide (NIPAM) as a monomer, a core–shell material was successfully prepared via in situ polymerization on the surface of silica microspheres (named NIPAM@Sil), which acts as a hydrophilic interaction chromatography (HILIC) stationary phase. A method for the in situ polymerization of polymer monomers on a silica surface has been developed. It was shown using scanning electron microscopy (SEM) that NIPAM is evenly distributed on the surface of the silica. The synthesized NIPAM@Sil possesses a polar acylamino group arising from the polymerization of NIPAM. As demonstrated by the hydrophilicity, NIPAM@Sil showed excellent HILIC performance for the separation of hydrophilic compounds. This method provides a simple approach for the preparation of a polymer coated silica core–shell stationary phase.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Junmin Wu,Wenxing Wang,Wenzhe Chen,Can Liu,Tianlong Deng,Xiaoping Yu
The extraction of lithium from liquid minerals, such as salt lake brines and underground brines, has garnered extensive interest due to its eco-friendly and cost-effective properties. However, the effectiveness of this method is constrained by the stability and capacity of the materials. Herein, a new-type inorganic carbon-supported H 2 TiO 3 adsorbent was developed by a novel in-situ polymerization synchronous conversion strategy. It was found that when resorcinol and formaldehyde containing Li 2 CO 3 and TiO 2 were polymerized in-situ and then calcined at 973.15 K, the resin was successfully carbonized to obtain the carbon supporter with a low degree of disorder, and the Li 2 CO 3 and TiO 2 in the supporter were synchronously converted into Li 2 TiO 3 and uniformly dispersed in the carbon matrix. Because of the large specific surface area and strong hydrophilicity of the carbon supporter, the material exhibited a maximum Li + adsorption capacity of 52.14 mg·g −1 , which was far higher than that of inorganic composite materials reported at present. Even the equilibrium adsorption capacity for Li + at a low concentration of 29.26 mg·L −1 reached 28.51 mg·g −1 . Following adsorption, the Li + in the material was easily eluted by 0.25 mol·L −1 HCl, and the elution rate was more than 90 % within 2 h. Dynamic adsorption using a fixed-bed was also performed at 298.15 and 343.15 K, and the adsorption capacity for the same concentration of Li + was 7.08 and 9.44 mg·g −1 , respectively. Because of the high capacity for low-concentration Li + and the promoting effect of temperature on adsorption, the material is well-suited for recovering Li + from liquid resources, particularly from geothermal water with high temperatures and low Li + concentrations.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2017
·
IF 0
Xiao Chen,Hua Lei,Tao Xu,Jie Zhang,Yu Qiu,Lu Tan
PMMA/nanoCu antibacterial plastic was prepared by in situ polymerization using MMA as monomer, BPO as initiator and surface treated nanoCu as antibacterial agent. AMEO was used for surface treatment of nanoCu. ATR-FTIR spectra showed that AMEO successfully reacted on the surface of nanoCu. SEM spectra showed that nanoCu dispersed evenly in the PMMA/nanoCu composite. Antibacterial test results showed that the composite had a strong antibacterial effect on Escherichia coli, and the antibacterial rate reached more than 99%. Therefore, the PMMA/nanoCu composite can be used in various fields of antibacterial plastic products.
研究领域:
材料科学
·
生物学
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Mingming Zuo,Tianqing Liu,Jingjing Han,Yuanchun Tang,Feng Yao,Yufeng Yuan,Zhihong Qian
A new series of microcapsules for the fabrication of gel breakers were prepared by in situ polymerization with polypyrrole and glycerol as shell materials and ammonium persulfate as core material. The morphology, shell wall thickness and size distribution of the microcapsules were characterized through transmission electron microscope, scanning electron microscopy, dynamic light scattering and optical microscope. The controlled releases of ammonium persulfate in the microcapsules were studied at different temperatures. The release time and rate were completely controlled by changing the shell wall thicknesses, components and temperature.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 8
·1530
·
IF 4.967
Hui Fang,Lingjie Zhang,Anlin Chen,Fangjuan Wu
Polylactic acid (PLA)-thermoplastic polyurethane (TPU) copolymer (PTC) was prepared by melting TPU pellets in molten lactide, followed by in situ ring-opening coordination polymerization. The results from FTIR and1H-NMR confirmed the formation of the copolymer. PLA/TPU blends with different TPU contents were prepared by melt blending method. SEM and mechanical properties showed a conspicuous phase separation between PLA and TPU. In order to further improve the mechanical properties of the blend, PTC was used as the compatibilizer and the effects of the PTC content on the properties of the blend were investigated. The addition of PTC made TPU particles smaller in PLA matrix and improved the compatibility. With the loading of 5 wt.% PTC, the impact strength of the PLA/TPU blend reached 27.8 kJ/m2, which was 31.1% and 68.5% higher than that of the blend without PTC and pure PLA, respectively. As the content of PTC was more than 5 wt.%, the mechanical properties declined since the compatibilizer tended to form separate clusters, which could reduce the part distributed between the dispersed phase and the matrix, leading to a reduction in the compatibility of the blend. Moreover, the DMA results confirmed PTC could improve the compatibility between PLA and TPU.Keywords:polylactic acid;thermoplastic polyurethane;in situ polymerization;compatibility
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 22
·7827
·
IF 4.927
Yunhao Zhao,Yueyue Wang,Rui Liang,Guobin Zhu,Weixing Xiong,Honghe Zheng
The overall electrochemical performance of natural graphite is intimately associated with the solid electrolyte interphase (SEI) layer developed on its surface. To suppress the interfacial electrolyte decomposition reactions and the high irreversible capacity loss relating to the SEI formation on a natural graphite (NG) surface, we propose a new design of the artificial SEI by the functional molecular cross-linking framework layer, which was synthesized by grafting acrylic acid (AA) and N,N′−methylenebisacrylamide (MBAA) via an in situ polymerization reaction. The functional polymeric framework constructs a robust covalent bonding onto the NG surface with —COOH and facilitates Li+conduction owing to the effect of the —CONH group, contributing to forming an SEI layer of excellent stability, flexibility, and compactness. From all the benefits, the initial coulombic efficiency, rate performance, and cycling performance of the graphite anode are remarkably improved. In addition, the full cell using the LiNi0.5Co0.2Mn0.3O2cathode against the modified NG anode exhibits much-prolonged cycle life with a capacity retention of 82.75% after 500 cycles, significantly higher than the cell using the pristine NG anode. The mechanisms relating to the artificial SEI growth on the graphite surface were analyzed. This strategy provides an efficient and feasible approach to the surface optimization for the NG anode in LIBs.Keywords:natural graphite;artificial SEI;in situ polymerization;lithium-ion batteries
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SN Applied Sciences
·
2019
·Vol. 1
·期 11
·1-8
·
IF 0
Zhang Xue,Sun Lei,Chen Yingbo,Yin Cuiyu,Liu Dongqing,Ding Ermin
Flame retardant polyamide 6 (PA6) composites (PA6/PTCDA) were prepared by in situ polymerization of caprolactam with adding 0.01–2.5 wt% perylene-3,4,9,10-tetracar-boxylic dianhydride (PTCDA). The structure and properties of PA6/PTCDA composites were studied by Fourier transform infrared spectroscopy, X-ray diffraction, differential scanning calorimetry, thermogravimetric analysis, thermal conductivity, and limiting oxygen index (LOI) measurements. The results indicated that the crystallization of the PA6 chains was suppressed with 2.5 wt% PTCDA, and the LOI of the composite was 29.5. At the same time, the addition of PTCDA made the composites form a coke layer in the process of combustion, protecting the flammable components from volatilization and enhanced the flame retardant performance of the composites. This indicated that the PA6/PTCDA composite prepared by in situ polymerization possessed good flame retardant properties.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 18
·9131-9137
·
IF 5.968
Mimi Tao,Fu Liu,Lixin Xue
A method of obtaining a hydrophilic and antifouling poly(vinylidene fluoride) (PVDF) membrane is developed via in situ polymerisation of 2-hydroxyethyl methacrylate (HEMA) in PVDF solution and subsequent micro-phase separation. The immobilization of PHEMA in a PVDF membrane was verified by Fourier Transform Infrared Spectroscopy (FTIR) and 1H Nuclear Magnetic Resonance Spectroscopy (1H-NMR). X-ray Photoelectron Spectroscopy (XPS) studies further unveiled the enrichment of PHEMA on the PVDF membrane surfaces. Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) images revealed that the modified membrane had a fibrous-like microstructure in the cross section and a porous top surface. Water contact angle measurement suggested that the modified membrane formed by in situ polymerisation and micro-phase separation possessed higher hydrophilicity than the control membrane formed by blending PVDF and pre-polymerised PHEMA. The protein fouling of the modified membrane was considerably alleviated and the dried membrane showed spontaneous wettability and excellent permeability. Based on Wide-Angle X-ray Diffraction (WAXD) and the above results, a possible membrane formation mechanism for the in situ polymerisation and subsequent micro-phase separation was proposed.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Chengyu Zheng,Dechao Hu,Zhengbiao Liu,Xiancheng Zhang,Kanghua Yu,Wenshi Ma
Thermal insulation coatings are an efficient thermal management material that can effectively prevent heat exchange between the building and outside world, realizing building energy efficiency. In this paper, a new thermal insulation coating was innovatively developed by synthesizing silica xerogel within acrylic emulsion via in situ polymerization. Compared to the pure acrylic coating, the thermal insulation coating with 30 % silane concentration forms a promising xerogel structure, resulting in a thermal conductivity of 0.07 W/(m·K), which is 61 % lower than that of pure acrylic coating. And the surface temperature of the thermal insulation coating with 30 % silane concentration was found to be 12.1 °C lower than pure acrylic coating after placing on the hot stage for some time. These findings indicate that silica xerogel network was effectively synthesized in the acrylic emulsion through in situ polymerization and that the thermal insulation coating displays low thermal conductivity and admirable thermal insulation qualities. The xerogel-acrylic composite coating produced by this research offers a novel form of thermal insulation coating, and the in situ polymerization of silica xerogel can also promote the synthesis of multifunctional composite coatings in various aqueous emulsions.
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
IRANIAN POLYMER JOURNAL
·
2020
·Vol. 29
·期 3
·275-286
·
IF 1.707
Shao Ming-lu,Yue Xiang-an,He Jie
To better control the gelation time of in situ polymerization of gel system in reservoir, an activator regenerated by AGET (activator generated by electron transfer) ATRP (atom transfer radical polymerization) initiating system was developed. The AGET ATRP initiating system was composed of an initiator 1,2-dibromoethane, a catalyst ferric chloride and a reducing agent vitamin C, and the effects of these three component proportions on the gelation time and gel viscosity were systematically investigated. Results of bottle tests indicated that the gelation time can even be more than 20 h at 60 °C at optimal concentration ratios. Moreover, the viscosity decreased and the gelation time increased with the increase of salinity and temperature. The gelation time of the core test was 1.5 times or even longer in comparison with that of the bottle test owing to the influences of dilution, adsorption, and rock skeleton isolation. It was also confirmed that the AGET ATRP initiating system can initiate the cross-link gelation of monomers in the core. The enhanced oil recovery result indicated that the oil recovery increased by 9.17% after the gelation of the gelling solutions, and final oil recovery was 40.05%. This research provided a brand-new method to control the gelation time of the in situ polymerization of gel system.
研究领域:
化学工程
·
石油工程
✓ 已验证
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2013
·Vol. 291
·期 7
·1573-1580
·
IF 2.161
Zhao Xuejuan,Zhang Jun,Chen Shuangjun,Wang Xiaolin,Wang Jianxin
The in situ polymerization of poly(ethylene glycol) methyl ether methacrylate (PEGMA) in poly(vinylidene fluoride) (PVDF) solution was carried out to prepare hydrophilic PVDF/PPEGMA blends. Based on T
g data, the system displayed some miscibility at low PPEGMA content because there were some interactions between PVDF and PPEGMA, as illustrated by Fourier transform infrared spectroscopy analysis, while the miscibility disappeared at high PPEGMA content. The β phase was the predominant crystalline phase of PVDF in the in situ blends, which was independent on PPEGMA content. However, the addition of PPEGMA could change the unit cell structure in the direction of the a -axis of β phase. The degree of crystallinity of the in situ blends calculated by wide-angle X-ray diffraction and differential scanning calorimetry displayed different tendencies with PPEGMA content. The scanning electron microscopy showed that the “spherulites” size increased with the increase in PPEGMA content, since the “spherulites” were comprised of not only crystalline PVDF but also amorphous PVDF and PPEGMA. In addition, the in situ blend had a great improvement in the hydrophilicity; specifically, its water contact angle was down to 26° when the PPEGMA content only increased to 26.9 wt.%.
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
危险品化学品经营许可证（带存储）