JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 22
·52234
·
IF 3.057
Changkai Linghu,Lijin Xie,Le Yang,Xiaolong Li,Yao Tao,Yinhan Xu,Zhu Luo
Grafted maleic anhydrides (MAHs) are common compatibilizers, and the Epoxy (EP) group exhibits high activity of epoxy functional groups and strong affinity with both acidic and basic groups. Therefore, high efficiency and broad-spectrum compatibilizers can be obtained by grafting these two monomers onto the polymer molecular chain. In this study, the grafted MAH was used as the graft platform to add the second graft monomer, and the bisphenol A epoxy resin (E51) with two epoxy functional groups or the tri-epoxy functional triglycidyl isocyanurate (TGIC), was added into the polylactic acid molecular chain, in order to prepare the double-monomer grafted PLA compatibilizers. Three kinds of compatibilizers, polylactic acid grafted maleic anhydride (PLA-g-MAH), polylactic acid double grafted maleic anhydride/bisphenol A epoxy resin (PLA-g-MAH-E51), and polylactic acid double grafted maleic anhydride/triglycidyl isocyanurate (PLA-g-MAH-TGIC) were successfully prepared using this single-step method. Finally, FTIR and 1 H-NMR were adopted to measure the grafting degrees and structures of the grafted products. The grafting degree of PLA-g-MAH20% was 5.36%, the MAH and EP grafting degrees of PLA-g-MAH 20%-E51 6% were 2.47% and 1.15%, respectively, and the MAH and EP grafting degrees of PLA-g-MAH 20%-TGIC6% were 2.30% and 0.93%, respectively. A portion of that EP was grafted onto the PLA molecular chain by reacting with grafted anhydride, resulting in a decrease in the number of grafted anhydride groups.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Wenxu Zhang,Xuyang Mu,Yan Xu,Sijie Li,Xiaoming Liu,Ziqiang Lei
Temperature/pH-responsive hydrogels are one of the most studied environmental-responsive hydrogels, with sensitivity and rapid response being the sought-after properties, while sensitivity and reusability are generally poor. This study prepared a hydrogel with a temperature/pH-responsive core-shell structure by static template polymerization, using the temperature-sensitive monomer dimethylaminoethyl methacrylate polymerized with 2-acrylamide-2-methylpropanesulfonic acid as the temperature-sensitive shell and popcorn with acrylic acid as the pH-responsive core-layer hydrogel. The chemical structure, thermal stability, and morphology of the core-shell structure hydrogels were characterized by Infrared spectroscopy (FTIR), X-ray diffraction (XRD), Brunauer-Emmett-Teller surface (BET), Scanning electron microscopy (SEM), Atomic force microscopy (AFM) and Thermogravimetric analysis (TG), respectively. The pH responsiveness well as the temperature responsiveness of the shell structure was tested. The results showed that the lowest critical solution temperature (LCST) of the core-shell hydrogel is 43 ℃, with good temperature responsiveness in the range of 25–55 ℃, pH responsiveness from pH= 4 to pH= 13, and a short response time. From SEM, AFM, and BET, it can be concluded that the hydrogel has a rough surface and pore structure with a root mean square roughness value of 0.787 nm, a specific surface area of 1.3381 m²/g, and an average pore size of 4.0911 nm. FTIR and XRD can show that popcorn (PCP) is well-doped in the core-shell structure hydrogel, which also proves the existence of the core-shell structure. The design of the core-shell structure enhanced the stability performance of the shell temperature-sensitive hydrogel so that the retention rate of the sample was still 37% at 800 °C, and the water retention rate was still 80.7% after repeated immersion in distilled water 7 times, which has good prospects for agricultural and pharmaceutical applications.
研究领域:
材料科学
·
生物医学工程
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DOI
高影响因子
MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 4
·1-7
·
IF 5.7
Duan Dingding,Wang Jun,Han Pengxin,Liu Xin,Zhao Luhang,Ma Shenao
A molecularly imprinted electrochemical sensor (MIECS) for trace determination of taurine was developed. The sensor was constructed by electropolymerizing dopamine and o-phenylenediamine as dual monomers on the surface of amino-functionalized iron-based MOFs and graphene composite-modified electrode. The porous structure and large specific surface area of amino-functionalized iron-based MOFs not only increase the number of imprinted sites, but also facilitate the binding of molecularly imprinted films. The presence of dual monomers can increase the binding sites during the formation of imprinted films. The linear range of this sensor for taurine detection is 1.00 × 10 −14 –1.00 × 10 −8 mol L −1 with a determination limit of 3.20 × 10 −15 mol L −1 . The proposed MIECS was successfully applied to quantify the amount of taurine in human serum sample with good recovery values from 97.3 to 113%. Graphical Abstract
研究领域:
分析化学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Yiwei Liu,Xiaopeng Hu,Yide Xia,Faqiong Zhao,Baizhao Zeng
In this work, a novel signal on/off ratiometric electrochemical sensor for the selective detection of chlorpromazine (CPZ) was developed. The sensor was constructed by electrodepositing dual-monomer molecularly imprinted polymer (DMMIP) film on the surface of Pt/Co 3 O 4 nanoparticles modified glassy carbon electrode, using CPZ as template molecule, methylene blue and catechol as functional monomers. The copolymerization of two monomers increased the diversity of functional groups for binding template molecules, and enhanced stability. The quantitative detection of CPZ was performed by differential pulse voltammetry, using the peak current of poly (methylene blue) as reference signal and the peak current of CPZ as indicating signal. The results showed that the developed DMMIP sensor not only possessed high selectivity and sensitivity, but also exhibited satisfactory anti-interference ability. Under the optimum conditions, a linear detection range of 0.005–9 μmol L −1 (R 2 = 0.9962) was obtained, and the limit of detection was 2.6 nmol L −1 . Moreover, the sensor showed good reproducibility and stability toward CPZ detection. It was applied to detect CPZ in serum and pharmaceutical samples, and satisfactory recoveries (ranging from 95.3% to 108.0%) were achieved.
研究领域:
分析化学
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电化学
·
药物检测
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yunfeng Yuan,Xiaoqi Liu,Chenjia Jiang,Haodong Zhou,Jinhua Zhu,Abdelhadi El Jaouhari,Xiuhua Liu,Minghua Lu
A novel dual-monomer magnetic molecularly imprinted polymer (D/L-MMIP) was developed for the selective extraction of luteolin (Lut) by synergistically combining covalent and non-covalent imprinting strategies. The D/L-MMIP was synthesized via free radical polymerization using phenylboronic acid-functionalized Fe 3 O 4 nanoparticles (covalent monomer) and acrylamide (non-covalent monomer). Comprehensive characterization (FT-IR, XRD, SEM, VSM) verified the successful fabrication of D/L-MMIP, confirming its molecularly imprinted structure, spherical morphology, and strong magnetic responsiveness, with Fe 3 O 4 enabling rapid separation (<30 s). The adsorption kinetics reached equilibrium within 120 min at room temperature. Adsorption studies demonstrated pseudo-second-order kinetics (R 2 > 0.99) and Langmuir isotherm behavior (R 2 > 0.99), yielding a maximum adsorption capacity (q max ) of 15.9 mg·g −1 , which was significantly higher than those of non-imprinted (D/L-MNIP, 7.3 mg·g −1 ) and single-monomer MIPs (S/L-MMIP: 4.2 mg·g −1 ; S/L-CMMIP: 7.4 mg·g −1 ). The D/L-MMIP exhibited exceptional selectivity for Lut (imprinting factor = 4.76) over structurally similar flavonoids (quercetin, rutin, hyperoside), with selectivity coefficients (α) of 6.15, 2.64, and 1.53, respectively. The pH-responsive boronic ester bond facilitated efficient template release under acidic conditions (pH ∼ 2.1), while the material maintained 83.5 % of its adsorption capacity after five regeneration cycles. When applied to Lonicera japonica Thunb. extracts, D/L-MMIP enrichment improved Lut purity from 36 % to 60 % (as determined by HPCE), demonstrating its practical applicability. This study provides a sustainable and efficient strategy for the selective separation of bioactive compounds, leveraging the complementary advantages of covalent and non-covalent interactions for enhanced molecular recognition.
研究领域:
分析化学
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高分子科学
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材料科学
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分离技术
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天然产物化学
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纳米技术
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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）