JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 17
·
IF 1.64
Fang Ping Wang,Jun Ying Zhang,Hu Po Mu,Wan Xia Li,Ting Yuan,Xin Zhen Du
A pH-sensitive hydrogel [P(CE- co -DMAEMA- co -MEG)] was synthesized by the free-radical crosslinking polymerization of N,N -dimethylaminoethyl methacrylate (DMAEMA), poly(ethylene glycol) methyl ether methacrylate(MPEG-Mac) and methoxyl poly(ethylene glycol)-poly(caprolactone)-methacryloyl methchloride (PCE-Mac). The effects of pH and monomer content on swelling property, swelling and deswelling kinetics of the hydrogels were examined and hydrogel microstructures were investigated by SEM. Sodium salicylate was chosen as a model drug and the controlled-release properties of hydrogels were pilot studied. The results indicated that the swelling ratios of the gels in stimulated gastric fluids (SGF, pH = 1.4) were higher than those in stimulated intestinal fluids (SIF, pH = 7.4), and followed a non-Fickian and a Fickian diffusion mechanism, respectively. In vitro release studies showed that its release rate depends on different swelling of the network as a function of the environmental pH and DMAEMA content. SEM micrographs showed homogenous pore structure of the hydrogel with open pores at pH 1.4. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40737.
研究领域:
材料科学
·
药学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Quangang Cheng,Zihao Zhao,Ziran Zhu,Shaoqi Zhang,Liujian Wang,Chuyao Wang,Zheng Cao,Leyi Pan,Liping Zhu,Baoku Zhu
A fabrication strategy for positively charged nanofiltration (NF) membranes is proposed based on the blending system of amphiphilic copolymer poly(acrylonitrile-co-dimethylaminoethyl methacrylate) (AN-DMAEMA) and homopolymer poly(dimethylaminoethyl methacrylate) (PDMAEMA). The membrane is first cast by non-solvent induced phase separation (NIPS), followed by a 5 min annealing-crosslinking post-treatment to synergistically tailor its charge density and pore structure. This system enables the synergistic regulation of positive charge density and pore size of the separation membrane by tuning the blending ratio of PDMAEMA. Experimental results show that the optimized NADBPD-20 % membrane possesses a mean pore size (μp) of 0.84 nm and an isoelectric point (IEP) of 9.07, exhibiting a water flux of 9.56 L/(m 2 h bar) at 0.4 MPa, with rejection rates of 94.2 % and 95.1 % for MgCl 2 and CaCl 2 , respectively. At pH = 5, the rejection rates for poly(hexamethylene biguanide) hydrochloride (PHMB), chlorhexidine (CHX), and hexamidine diisethionate (HDI) reach 99.3 %, 98.4 %, and 93.0 %, respectively. The membrane shows excellent static antifouling performance against Bovine Serum Albumin (BSA) solution, with a flux recovery rate of 89.5 % after dynamic filtration fouling with BSA. Simulated wastewater treatment experiments validate its capability for simultaneous hard water softening and cationic disinfectants removal. Additionally, it maintains continuous filtration stability for 36 h during the filtration of a mixed solution of MgCl 2 and CHX. This study provides a feasible solution for the efficient removal of Ca 2+ /Mg 2+ and cationic pollutants in water bodies.
研究领域:
膜科学
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高分子化学
·
水处理
·
分离技术
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Qian Liu,Liulin Wei,Xiaomei Chen,Xueyun Gao,Jingchan Zhao
In this work, we rationally designed a facile dispersible and self-collectible nano-adsorbent GR@p(POSS-co-DMAEMA) to simplify the dispersive solid-phase microextraction (DSPME). The difficulty of allowing close contact between the nano-adsorbent and donor sample solution was solved, thus improving the extraction efficiency. Furthermore, the GR@p(POSS-co-DMAEMA) with temperature-sensitive property can self-collect at high temperature, simplifying the DSPME steps (7 min). Fabrication and dispersity of GR@p(POSS-co-DMAEMA) were certified by characteristic analyses. Based on above, a method for analyzing four parabens by GR@p(POSS-co-DMAEMA)-DSPME combined with HPLC-UV was established. The feasibility of the method was verified in simulated water targeting four parabens with good precision (RSD%, 1.7–11.3, n = 3) and low detection limits (0.29–0.63 ng mL −1 ) under optimal conditions. The method was successfully applied to analyze three condiments and obtained relative recoveries between 91.20 and 133.71%. The results showed that the proposed method is promising to be a fast, efficient and reliable method for the trace analysis of parabens.
研究领域:
分析化学
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食品科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2016
·Vol. 23
·期 9
·1-9
·
IF 1.969
Kong Zhiyun,Wu Xiaoqing,Wei Junfu,Zhang Huan,Cui Li
The hydrophilic fibers based on 2-(dimethylamino)ethyl methacrylate (DMAEMA) which could remove Cr(VI) ions rapidly were prepared by UV-irradiation induced grafting of DMAEMA through pre-coating photoinitiator on the fibers and modifying with bromoethane(BE). The FTIR, FESEM, XPS, TG-DTG and contact angle spectra manifested that DMAEMA was grafted onto the surface of PP fibers and subsequently was quaternized. The maximum grafting degree (22.9 %) and exchange capacity of DMAEMA (1.2 mmol g −1 ) was obtained when PP fibers was immersed in BP concentration of 0.3 % for 4 h, irradiated with the DMAEMA concentration of 100 % and irradiation time of 20 min, and then was modified with BE. The modified fibers of PP-g-DMAEMA with bromoethane were proved to remove Cr(VI) and As(V) with removal rate of 97.3 % and 96.2 % within 10 min, respectively. The prepared fibers have potential application for the removal of Cr(VI) and As(V) from wastewater highly and rapidly.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Wanyu Zhang,Weiping Chen,Jiamin Lv,Ying Wu,Xinwu Ba,Liping Fang
Multi-responsive hydrogels for temperature sensor and information encryption were developed through the synergistic application of light, temperature and pH response of the hydrogel. The multi-responsive hydrogels were prepared by copolymerization of dimethylaminoethyl methacrylate (DMAEMA) and 7-(2-methacryloyloxyethoxy)-4-methylcoumarin (CoumMAc). Through incorporating coumarin groups into the hydrogels, the crosslinking degree of hydrogels could be increased by photo-crosslinking of polymer chains based on the photodimerization of coumarin groups. After the hydrogel was irradiated by a photomask under UV light (365 nm), the irradiated and unirradiated region in the hydrogel showed different crosslinking degrees, leading to different volume phase transition temperature (VPTT) in the two region of the hydrogel. The pattern in the hydrogel appeared only within a specific temperature range, and the temperature of the environment can be monitored by the prepared hydrogel sensor. After soaking the patterned hydrogel in the acidic solution, no pattern information was displayed at all temperatures, and the pattern information can only emerge by dual decryption (base and temperature). In addition, the information can be erased by UV light (254 nm), which further ensures information security. This work provide a new way for low-cost unpowered temperature sensors and information encryption with more security.
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
CELLULOSE
·
2021
·Vol. 28
·期 10
·6481-6498
·
IF 5.044
Lang Daning,Shi Ming,Xu Xia,He Shixue,Yang Chao,Wang Lu,Wu Ronglan,Wang Wei,Wang Jide
Abstract 4-Nitrophenol is a highly toxic environmental pollutant. It is a challenge to selectively remove it from a mixture of various pollutants. Herein, we report a study on the selective adsorption of 4-nitrophenol by using molecularly imprinted polymers (MIPs). The imprinted polymer was synthesized using cellulose as a framework, onto which, the complex of the imprinting molecule (i.e., 4-nitrophenol) and a candidate material [namely, 2-(dimethylamino)ethyl methacrylate. DMAEMA] was grafted. The obtained MIP showed an excellent adsorption capacity with good selectivity. Also, the adsorption of 4-nitrophenol by the obtained MIP was fast and the adsorbent exhibited good recyclability. The thermodynamics and kinetics of the adsorption process of 4-nitrophenol by MIP was thoroughly studied, where an otherwise-equivalent non-imprinted polymer was used as a control in the experiments. The selectivity of the MIP adsorbent for 4-niteophenol was evaluated by two types of experiments: (1) adsorption experiments in single-component adsorbate systems (containing 4-nitrophenol, 3-nitrophenol, catechol, or hydroquinone), and (2) competitive adsorption experiments in binary adsorbate systems (containing 4-nitrophenol plus either 3-nitrophenol, catechol or hydroquinone). The selectivity coefficient for 4-nitrophenols was twice of those of other phenols (that were all around 2), indicative of the extent of the affinity of MIPs to these phenolic compounds. The recyclability of the adsorbent was evaluated for 5 adsorption–desorption cycles, where the adsorption capacity of the last cycle remained over 90.2% of that of the first cycle. Graphic Abstract
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2018
·Vol. 9
·期 23
·3215-3222
·
IF 4.927
Ni Zeng,Yuyan Yu,Junbing Chen,Xiao Meng,Leilei Peng,Yi Dan,Long Jiang
Although branched polymers find widespread applications, the rational design and synthesis of branched vinyl polymers via the conventional radical (co)polymerization of commercially available monomers is still a challenge for researchers in this field. Using branched polyvinyl acetate (PVAc) as a proof-of-concept, we report a facile approach to synthesize branched polymers via redox-initiated radical copolymerization. In this case, the commercially available monomer 2-(dimethylamino)ethyl methacrylate (DMAEMA), containing both a vinyl group and an initiator fragment (tertiary amine group), serves as an inimer in the presence of an oxidant to copolymerize with vinyl acetate (VAc), leading to the formation of branching architectures. The copolymerization kinetics investigation as well as electron paramagnetic resonance (EPR) measurements were conducted to reveal the reactivity of DMAEMA and the development of branching architectures, while TD-SEC and 1H-NMR were employed to study the structures of the resulted polymers. The results confirm that DMAEMA can serve as an inimer for the preparation of branched PVAc. Moreover, balancing the feed ratio of DMAEMA to VAc enables the fine control of branching degree. Within our experimental design, a high feed ratio of DMAEMA to VAc leads to high branching, as demonstrated by the Zimm branching factor, g′. This novel methodology involves only commercially available monomers and conventional radical polymerization and hence offers a promising future for preparing branched vinyl polymers on a large scale and at low cost.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2020
·
IF 1.701
Hai-Feng Liu,Zhu Wang,Cheng-Jun Sun
The old-fashioned yet effective trans-printing method was adopted to prepare Janus fabric in the study. Nonwoven cotton fabric was firstly immersed in tetrahydrofuran solution containing P(DMAEMA-co-TMSPMA), a polymer synthesized by copolymerization between N, N-dimethylaminoethyl methacrylate (DMAEMA) and 3-(trimethoxysilyl)propylmethacrylate (TMSPMA), followed by thermal treatment, thus endowing the fabric with the demulsification property. Next, one side of the above prepared fabric was overlapped and rolled with donor fabric containing PDMS-g-TMOS, a polymer synthesized by thiol/ene click reaction between multi-vinyl poly(dimethylsiloxane) (vinyl-PDMS) and 3-mercaptopropyltrimethoxysilane (MPTMOS). The PDMS-g-TMOS polymer infiltrated into the fabric cured with P(DMAEMA-co-TMSPMA) to a certain depth, followed by thermal treatment. Thus, the resultant fabric had both the superhyrophilic side for oil coalescence and the superhyrophobic side for oil permeation. The Janus fabric structure was confirmed by metalloscope, unidirectional water transport property (UDWT), scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). When the prepared fabric was used to separate model oil hexadecane (HD) from oil-in-water emulsion, the maximum separation speed was 134.5 kg h−1 m−2. The recovery rate of HD respectively reached 96.0% after 60 min and 99.9% after 150 min. The Janus fabric prepared by the trans-printing method is particularly suitable for industrial production and of great industrial value.
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
RSC Advances
·
2015
·Vol. 5
·期 55
·44435-44446
·
IF 3.84
Yangyang Chen,Funian Mo,Shaojun Chen,Yan Yang,Shiguo Chen,Haitao Zhuo,Jianhong Liu
This study reports a novel shape memory copolymer synthesized with 2-(dimethylamino)-ethyl-methacrylate (DMAEMA) and methyl-allyl-polyethenoxy-ether (TPEG) for potential biological applications. In the DMAEMA–TPEG copolymers, TPEG segments form a semi-crystalline phase that serves as the reversible phase, while DMAEMA segments form an amorphous phase containing physical interactive networks that serve as the hard phase. As the TPEG content increases, the crystallinity and the rate of crystallization increase, and the TPEG phase changes from dispersed small spherical crystals to a continuous crystalline phase. Additionally, good crystallinity of the TPEG phase endows the copolymers with good shape fixity, whereas the shape recovery decreases as the TPEG content decreases. DMAEMA–TPEG copolymers also exhibit the multi-shape memory effect with a good triple-shape memory effect. Finally, the investigation of the water contact angle illustrates that all DMAEMA–TPEG copolymers have good hydrophilicity. Thus, it is proposed that DMAEMA–TPEG copolymers might have great potential for biological applications.
研究领域:
材料科学
·
生物医学工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2017
·
IF 3.684
Jia-Min Li,Chuan-Shan Hu,Jian-Ming Shao,Hui-Juan Li,Peng-Yun Li,Xi-Chuan Li,Wei-Dong He
Ternary hydrogels composed of poly[acrylamide- co -2-(dimethylamino)ethyl methacrylate] [P(AM- co -DMAEMA)], poly(vinyl alcohol) (PVA) and β -cyclodextrin ( β -CD) were fabricated based on the multiple physical interactions such as inclusion complexation, hydrogen bonding and polymer crystallinity , and exhibited high storage modulus . To illustrate the individual role of each physical interaction, symmetrical investigation has been performed. P(AM- co -DMAEMA)s with two compositions , prepared by radical polymerization at −20 °C below the freezing point of reaction medium of water, were served as the inclusion guest for the inclusion host of β -CD. The inclusion complex between dimethylaminoethyl group of DMAEMA and β -CD was identified through 2D NOESY NMR spectroscopy . Hydrogen bonding between each pairs of hydrogel components was confirmed with FTIR analysis and contributed the second form of crosslinkage. Under freezing polymerization and further freezing-thawing treatment, PVA component tended to crystallize to serve as the third type of physical crosslinkage, which was recognized with X-ray diffraction. Rheological and thermo-gravimetrical analysis was used to inspect the modulus and thermal stability of the hydrogels, respectively. Three hydrogels of P(AM- co -DMAEMA)/PVA-g- β -CD, P(AM- co -DMAEMA)/PVA/ β -CD and P(AM- co -DMAEMA)/PVA were synthesized under the same condition to make the comparison. The whole results disclosed the strong dependence of hydrogel properties on the hydrogel components, reflecting the synergistic effects of different physical crosslinkages for the formation of those physical hydrogels.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Zhigang Xiao,Lishuang Wang,Chunyue Lv,Shilong Guo,Xuanxuan Lu,Liwei Tao,Qingsong Duan,Qingyu Yang,Zhigang Luo
Copolymer nanoparticles with pH-responsive properties were prepared by grafting different amounts of 2-(dimethylamine) ethyl methacrylate (DMAEMA) on carboxymethyl maize starch (CMS). The formation of CMS-g-DMAEMA was verified by different techniques and was then used for stabilization of Pickering emulsion at different pH values. The CMS-g-DMAEMA nanoparticles showed pH-responsive properties in Pickering emulsion and the pH-responsivity increased as the amount of DMAEMA increased in the CMS-g-DMAEMA copolymer. The prepared Pickering emulsion underwent emulsion/demulsification transitions at different pH values. The microscopy analysis verified the attachment of CMS-g-DMAEMA on oil-water interface of Pickering emulsion. Pickering emulsion showed different droplets size, contact angle, and Zeta-potential depend on pH value and CMS/DMAEMA ratio in the CMS-g-DMAEMA copolymer. The obtained results revealed that CMS-g-DMAEMA copolymer can be successfully used for preparing and stabilizing of Pickering emulsion at pH 10.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Liang Qiu,Haoran Zhang,Bo Wang,Yong Zhan,Chengfen Xing,Cai-Yuan Pan
CO2-responsive polymeric nano-objects with assembly-related aggregation-induced emission (AIE) are obtained via polymerization-induced self-assembly (PISA) of 2-(dimethylamino)ethyl methacrylate (DMAEMA), 2-(4-formylphenoxy)ethyl methacrylate (MAEBA), and 4-(1,2,2-triphenylvinyl)phenyl methacrylate (TPEMA). These nano-objects exhibit, depending on the feed of MAEBA, a morphology evolution process from spherical micelles to vesicles. Due to the presence of DMAEMA units, CO2 promotes morphology transformation of the nano-objects from spheres to a mixture of “jellyfish” and vesicles and vesicles to complex vesicles. Moreover, TPEMA endows the AIE feature to these nano-objects, offering a strategy to monitor the morphology evolution process in real time. Thus, this approach is significant for exploring the assembly mechanism of copolymer in polymerization-induced self-assembly and designing multistimuli-responsive polymeric nanomaterials with tunable morphologies and sizes.
研究领域:
高分子科学
·
纳米技术
·
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）