CHEMICAL PAPERS
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2021
·Vol. 75
·期 10
·5561-5569
·
IF 2.097
Shao Tantan,Gong Yilu,Chen Xiaolong,Chen Lijun
Novel self-crosslinking long fluorocarbon acrylate polymer latex has been successfully prepared by semi-continuous seeded emulsion polymerization with methyl methacrylate(MMA), butyl acrylate (BA), dodecafluoroheptyl methacrylate (DFMA) and hydroxypropyl methacrylate(HPMA) as main monomers, 10-undecylenic acid (10-UA) and diallyl phthalate (DAP) as functional monomers. During the latex polymerization, the monomers were emulsified by the mixed surfactants of nonionic surfactant alcohol ether glycoside (AEG) and anionic surfactant sodium dodecylbenzene sulfonate (SDBS), and initiated by potassium persulfate (KPS). The resultant latex showed excellent properties. The chemical composition of latex was determined with Fourier transform infrared spectrum (FTIR) and the glass transition temperature (Tg) of polymer was detected by differential scanning calorimetry (DSC) and the water repellency of the prepared film was measured by water contact angle measurement (WCA). The reaction conditions were optimized and obtained as follows: the optimal monomer dosage was MMA: BA: DFMA: HPMA = 12.75:12.75:0.9:1.2, the amount of 10-UA and DAP was both 4% of all monomers, the dosage of AEG: SDBS was 5% (1:1) and KPS was 0.5%, respectively. The result indicated that the conversion of the mixed monomers was more than 98% and the coagulation was less than 1% and the resultant latex also had the outstanding appearance and latex performance.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Bowen Zhang,Yiqi Zhang,Jiufu Zhu,Zhanchen Cui,Wei Wang,Zuosen Shi
High performance polymeric dielectrics are of critical importance for obtaining high carrier mobility and realizing low operating voltage in OTFTs. In this work, copolymers poly(methyl methacrylate) containing 4-fluorostyrene monomer were used as insulating layers for OTFTs devices of C10-DNTT. With the increase of 4-fluorostyrene, the threshold voltage shifted positively, and the random copolymer poly(4-fluorostyrene–methyl methacrylate–glycidyl methacrylate)-5 (P(FSt-co-MMA-co-GMA)-5) exhibited a threshold voltage lower to 1.8 V, a hole mobility of up to 0.518 cm2 V–1 s–1, and a dielectric constant value of 5.66. XRD spectra reveal that C10-DNTT has the best morphology at (001) peak as the dielectric copolymer contains 5% 4-fluorostyrene monomer.
研究领域:
材料科学
·
电子学
·
高分子化学
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DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2016
·
IF 2.478
Bin Chen,Shenwen Fang,Ting Chen,Yan Xiong,Ming Duan
Compound poly(methylmethacrylate (MMA)-acrylic acid (AA)-ethyl acrylate (EA))/Fe 3 O 4 superparamagnetic nanoparticles were synthesized successfully by emulsion polymerization and solvothermal reaction methods. The nanoparticles were characterized by transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), Fourier transform infrared spectra (FT-IR), X-ray diffraction (XRD) and thermogravimetry analysis (TGA). P(MMA-AA-EA)/Fe 3 O 4 nanoparticles exhibited superparamagnetic properties with a saturation magnetization value of 20 emu/g. The selective adsorption behaviors of nanoparticles toward dyes were investigated and the function of electronic interaction during the adsorption process was also discussed.
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
高影响因子
Polymers
·
2021
·Vol. 13
·期 6
·968
·
IF 4.329
Yuzhi Xu,Ning Li,Guangbin Wang,Chunpeng Wang,Fuxiang Chu
The conversion of cornstalk lignin derived from the co-product of bio-refinery into value-added products such as polymeric material has remarkable environmental and economic potential. A novel bio-based methyl methacrylate copolymerized with butyl acrylate (MMA-co-BA) hybrid resin in our research was prepared by the reversible addition–fragmentation chain transfer method using lignin-graft-polyacrylamide (lignin-g-PAM) as a bio-derived macromolecular chain transfer agent. The molecular architecture of lignin-g-PAM and the lignin-based MMA-co-BA hybrid resin was elucidated using1H nuclear magnetic resonance and attenuated total reflectance–Fourier transform infrared. The thermal behavior and mechanical performance of the resultant lignin-based MMA-co-BA hybrid resins were also investigated through thermogravimetric analysis, differential scanning calorimetry, and a stress–strain test, respectively. The lignin-based acrylate resins system exhibited structure-related thermal and mechanical properties. Compared with pure MMA-co-BA resin, the incorporation of lignin into various lignin-based MMA-co-BA graft copolymers resulted in an improved tensile strength and a higher Young’s modulus. This research could provide not only a new avenue to utilize waste biomass for high-value applications, but also a reference for designing new materials for coatings or adhesives.Keywords:lignin;macromolecular chain transfer agent;RAFT miniemulsion polymerization;thermal behavior;mechanical performance
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
SURFACE AND INTERFACE ANALYSIS
·
2026
·
IF 2.7
Huiling Jia,Yuequan Jian,Jiayi Lv,Jinxiu Wu,Xiaoxiong Ma
The double-shell P (MMA-MPS)/SiO 2 /CeO 2 composite abrasive was designed and prepared through the soap-free emulsion polymerization, the sol–gel method, and the in situ chemical precipitation method. Take 3-(methacryloyloxy)propyltrimethoxysilane-modified methyl methacrylate (P (MMA-MPS)) microspheres as the core. The a SiO 2 and b SiO 2 inner shells were coated on the core in acidic and alkaline environments, respectively. The CeO 2 outer shell was then deposited on the inner shell. The morphology, structure, and chemical mechanical polishing performance on KDP crystals of composite abrasives were characterized using SEM, TEM, XRD, FTIR, XPS, and AFM. The results indicate that the P (MMA-MPS)/ a SiO 2 /CeO 2 abrasive possesses the “loose net-like” inner shell of a SiO 2 with the positive charge (-Si-OH 2 + ), leading to the sparser outer shell of CeO 2 and the expanded CeO 2 lattice. After polishing, the surface roughness (Ra) of KDP crystal is 0.69 nm, and the material removal rate (MRR) is 125.6 nm/min. The P (MMA-MPS)/ b SiO 2 /CeO 2 abrasive possesses the “dense strawberry-like” inner shell of b SiO 2 with the negative charge (-Si-O − ), which facilitates the uniform deposition of Ce 3+ through electrostatic adsorption, and forms the dense, complete and highly crystalline outer shell of CeO 2 . The proportion of Ce 3+ is increased by 2.5%. After polishing, the Ra of the KDP crystal further decreases to 0.43 nm, and the MRR increases to 146.2 nm/min. In summary, the comprehensive performance of the P (MMA-MPS)/ b SiO 2 /CeO 2 abrasive is superior to that of the P (MMA-MPS)/ a SiO 2 /CeO 2 abrasive.
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2015
·Vol. 33
·期 6
·857-868
·
IF 1.835
Du Chun-hui,Ma Xu-min,Wu Chun-jin,Cai Mei-qiang,Hu Meng-xin,Wang Ting
Polymerizable ionic liquid copolymer P(MMA- co -BVIm-Br) was synthesized by radical polymerization technique, and characterized by Fourier transform infrared spectrometry (FTIR), 1 H Nuclear magnetic resonance ( 1 H-NMR) and gel permeation chromatography (GPC). The resulting copolymer was used to prepare poly(vinylidene fluoride) (PVDF) blend membranes via a phase inversion method. The effects of the copolymer on the polymorphism, surface wettability and zeta potential ( ζ ) of the blend membranes were investigated by ATR-FTIR, contact angle instrument and zeta potential analyzer. Scanning electron microscopy (SEM and SEM-EDS) was also applied to investigate the morphology and the surface element changes of the fabricated membranes. The results indicated that P(MMA- co -BVIm-Br) copolymer existed on the surface of the membrane which made the blend membrane have a positive surface during the experimental pH range. The copolymer was also in favor of the formation of β crystal phase in PVDF membranes. The contact angle experiment indicated that P(MMA- co -BVIm-Br) copolymer could switch the wettability of the blend membranes from hydrophilic to hydrophobic by exchanging Br − anion with PF 6
− . Compared with pure PVDF membranes, the water flux and water recovery flux of the blend membranes were enhanced obviously. The results from the flux recovery ratio (FR) and total fouling ratio ( R
t ) all suggested that the blend membranes had good anti-fouling properties.
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
Polymer Chemistry
·
2015
·Vol. 6
·期 15
·2837-2843
·
IF 5.52
Yipeng Wei,Pingwei Liu,Wen-Jun Wang,Bo-Geng Li,Shiping Zhu
In emulsion atom transfer radical polymerization (ATRP), escape of catalytic copper ion species from the particle to the aqueous phase represents one of the major challenges which causes uncontrollable polymerization and/or unstable latex. We addressed this issue by employing a functional surfactant–ligand (SL) design as the capture agent (CA), which prevented the copper species from escape in the emulsion ATRP. In this work, emulsion ATRP of methyl methacrylate (MMA) mediated CuCl2/4,4-di(5-nonyl)-2,2′-bipyridine (dNbpy) was carried out with Brij-98 as a surfactant in the presence of a small amount of CA. The CA molecules effectively captured dissociated copper ions inside the particle, thus efficiently decreasing the copper ion concentration in the aqueous phase. Only 3 wt% of surfactant loading (0.6 wt% CA and 2.4 wt% Brij-98 based on MMA) was needed to achieve well-controlled ATRP and to stabilize the emulsion system, which is a significant reduction from a typical 13–18 wt% often used in the studies reported in the literature.
研究领域:
高分子化学
·
材料科学
·
纳米技术
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胶体与界面科学
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可控聚合
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DOI
高影响因子
Polymer Chemistry
·
2017
·Vol. 8
·期 39
·6073-6085
·
IF 5.375
Yan-an Wang,Yan Shi,Zhifeng Fu,Wantai Yang
Hexamethylphosphoramide (HMPA) has been found to be a novel and highly efficient organic catalyst for the reversible-deactivation radical polymerization (RDRP) of methyl methacrylate (MMA) with an in situ formed alkyl iodide initiator. The polymerization results exhibited typical features of “living”/controlled radical polymerization. The polymerization process efficiently controls the molecular weight and chemical structure of the resultant poly(methyl methacrylate) (PMMA). Furthermore, the inhibition period was shortened and the polymerization rate was increased upon the addition of HMPA as compared to blank controls. Due to the high reactivity of HMPA, the molecular weight and molecular weight distribution of the resultant PMMA were well controlled at high monomer conversions at mild temperatures (Mw/Mn = 1.12–1.22, 60–70 °C). Notably, high-molecular-weight PMMA with a narrow molecular weight distribution were successfully obtained (Mn up to 104 000, Mw/Mn = 1.34). The living feature of the obtained polymers was confirmed by chain extension and block copolymerization. The mechanism for the controlled polymerization catalyzed by HMPA was also discussed. In brief, HMPA as a catalyst for RDRP with in situ formed alkyl iodide not only could simplify the polymerization process but also would be applicable as a powerful and robust method for well-defined polymers.
研究领域:
高分子化学
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有机催化
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聚合反应机理
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功能高分子材料
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可控自由基聚合
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DOI
高影响因子
Advanced Materials Technologies
·
2019
·Vol. 4
·期 5
·1900039
·
IF 5.395
Ce Zhang,Zhenfu Liu,Hongxia Liu,Shuai Wang,Yang Zhang,Chunhao Li,Yun Wu
The control of surrounding humidity by porous films is an interesting aspect for improving human comfort. Especially, light triggered humidity control is of relevance because light stimulus is contactless so that reducing the impact on both materials and surroundings. In this work, reversible light responsive films with tunable wettability and the ability of regulating surrounding humidity are developed from acrylated spiropyran (SPA)–methyl methacrylate (MMA) copolymer by electrospinning. The electrospun films for regulating wettability and surrounding humidity can be reversibly manipulated by the simple switch of UV and visible light irradiation because of the unique transformation between polar ring-opened status and nonpolar ring-closed status of spiropyran units. Morphology analyses and Cassie theory are used to explain this phenomenon and it is found that surface microstructure and effective chemical composition of the film surface can both significantly influence the reversible variation range of the value of surrounding humidity and surface wettability. The results show that the ability to regulate humidity of 40 wt% poly(SPA- co -MMA) film possessing bead-on-string fiber surface structure is the best.
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
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 17
·
IF 1.86
Chunhui Du,Xumin Ma,Jing Li,Chunjin Wu
This study describes the fabrication and properties of poly(vinylidene fluoride) (PVDF) filtration membranes modified by blending with ionic liquid block copolymer P(MMA- b -MEBIm-Br), which is synthesized via reversible addition-fragmentation chain transfer polymerization method. The attenuated total reflectance-Fourier transform infrared spectroscopy and X-ray photoelectron analyses reveal that the ionic liquid block copolymers are immobilized on PVDF membrane surface. The modified PVDF membrane exhibits excellent charged and antifouling properties because of the charged and hydrophilic properties of the copolymer. Scanning electron microscopy and atomic force microscopy also indicate the morphological characteristics of the membrane and demonstrate that the surface porous structure becomes denser after adding the copolymer. The data of filtration and the zeta potential of the membranes suggest that the charged properties of the ionic liquid block copolymers are mainly responsible for the improvement of the reversible fouling ratio and the decrease in the total fouling ratio of the membranes. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44751.
研究领域:
材料科学
·
环境工程
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产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 11
·2501
·
IF 5
Panpan Zhang,Qiongqiong Xu,Wenyu Mao,Jiaxing Lv,Haodong Tang,Huadong Tang
A novel synthesis of ultrahigh molecular weight poly(methyl methacrylate) (PMMA) using organosulfur compounds combined with a catalytical amount of transition metal carboxylates as an initiator has been developed. The combination of 1-octanethiol with palladium trifluoroacetate (Pd(CF3COO)2) was found to be a very efficient initiator for the polymerization of methyl methacrylate (MMA). An ultrahigh molecular weight PMMA with a number-average molecular weight of 1.68 × 106Da and a weight-average molecular weight of 5.38 × 106Da has been synthesized at the optimal formulation of [MMA]:[Pd(CF3COO)2]:[1-octanethiol] = 94,300:8:23 at 70 °C. A kinetic study showed that the reaction orders with respect to Pd(CF3COO)2, 1-octanethiol, and MMA are 0.64, 1.26, and 1.46, respectively. A variety of techniques such as proton nuclear magnetic resonance spectroscopy (1H NMR), electrospray ionization mass spectroscopy (ESI-MS), size exclusion chromatography (SEC), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and electron paramagnetic resonance spectroscopy (EPR) were employed to characterize the produced PMMA and palladium nanoparticles (Pd NPs). The results revealed that Pd(CF3COO)2was firstly reduced by the excess of 1-octanethiol to form Pd NPs at the early stage of the polymerization, followed by the adsorption of 1-octanethiol on the surface of nanoparticles and subsequent generation of corresponding thiyl radicals to initiate the polymerization of MMA.Keywords:ultrahigh molecular weight;PMMA;polymerization;kinetics;mechanism
研究领域:
高分子化学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2025
·
IF 6.3
Yazhou Duan,Weihan Tao,Yinchun Fang,Xianfeng Wang
Textiles-based wearable sensors with colorimetric sensing can transform external stimuli to visible color changes, which are ideal for the development of low-cost wearable sensors. Among them, textile-based water-response structural color colorimetric sensors have received wide attention for their pollution-free and eco-friendly characteristics. In this research, poly (styryl-methyl methacrylate-[3-(methylacrylamide) propyl] trimethyl ammonium chloride) (P(St/MMA/MAPTMA)) microspheres with hydrophilic quaternary ammonium salt groups were prepared, which were atomized and deposited on textile fabrics anticipating to prepare textile-based water response colorimetric sensors. P(St/MMA/MAPTMA) microspheres with different particle diameters were obtained by adjusting the mass ratios of the monomers, which were assembled on the fabrics to form different structural colors. These structural colors showed fast water response property to change color when they were wetted by water within 2 s. The P(St/MMA/MAPTMA) microspheres structural colors on the fabrics can return to their original structural colors after drying showing the reversible water responsiveness, which have the promising application prospect of water-response colorimetric sensors. Moreover, the antibacterial rates of these structural colors on fabrics were greater than 98 % showing excellent antibacterial properties. This research shows that this textile-based water-response structural color colorimetric sensors exhibit potential application prospects in the field of water content monitoring, such as the diapers for monitoring the amount of baby’s urine, or the clothing for monitoring the amount of human sweat.
研究领域:
材料科学
·
传感器与传感技术
·
可穿戴电子
·
光子材料
·
智能纺织品
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）