POLYMER BULLETIN
·
2020
·Vol. 78
·期 8
·4403-4417
·
IF 2.014
Zhu Yongfei,Li Peilin,Lin Runsheng,Su Junming
Both pyrogallol-furfurylamine-based and pyrogallol-aniline-based di-benzoxazines (PG-FA and PG-A) possess a free hydroxyl and latent catalytic characteristics. To decrease the ring-opening polymerization (ROP) temperature of benzoxazine based on phenol and 4,4′-diaminodiphenylmethane (P-DDM) and increase simultaneously thermal property of its polymer, PG-FA and PG-A as catalysts were introduced into P-DDM. DSC and FTIR tests were used to investigate the effect of PG-FA and PG-A on the ROP of P-DDM; DMA, FTIR and TGA were performed to study their effects on the hydrogen bonds and thermal property of the cured P-DDM (PP-DDM). The results indicate that the ROP temperature of P-DDM remarkably decreased with the incorporation of PG-FA and PG-A. FTIR and DMA results illustrate that the total amounts of hydrogen bonds in PP-DDM increased with the addition of PG-FA or PG-A; however, its fraction of –OH⋯N (intra) and O − ⋯ + HN (intra) hydrogen bonds decreased. The decrease in –OH⋯N hydrogen bonds made the cross-linked density of polybenzoxazine increase, resulting in that the thermal stability of PP-DDM enhanced with the introduction of PG-FA and PG-A.
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2018
·Vol. 23
·期 12
·3225
·
IF 3.098
Qianru Liu,Xican Li,Xiaojian Ouyang,Dongfeng Chen
To explore whether and how glucuronidation affects pyrogallol-type phytophenols, scutellarein and scutellarin (scutellarein-7-O-glucuronide) were comparatively investigated using a set of antioxidant analyses, including spectrophotometric analysis, UV-vis spectra analysis, and ultra-performance liquid chromatography coupled with electrospray ionization-quadrupole time-of-flight tandem mass spectrometry (UPLC-ESI-Q-TOF-MS/MS) analysis. In spectrophotometric analyses of the scavenging of 1,1-diphenyl-2-picrylhydrazyl (DPPH•), 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS+•), and 2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide radicals (PTIO•) and the reduction of Cu2+ions, scutellarein showed lower IC50values than scutellarin. However, in•O2−-scavenging spectrophotometric analysis, scutellarein showed higher IC50value than scutellarin. The analysis of UV-Vis spectra obtained after the Fe2+-chelating reaction of scutellarin showed a typical UV-Vis peak (λmax= 611 nm), while scutellarein showed no typical peak. In UPLC-ESI-Q-TOF-MS/MS analysis, mixing of scutellarein with DPPH•yielded MS peaks (m/z678, 632, 615, 450, 420, 381, 329, 300, 288, 227, 196, 182, 161, and 117) corresponding to the scutellarein-DPPH adduct and an MS peak (m/z570) corresponding to the scutellarein-scutellarein dimer. Scutellarin, however, generated no MS peak. On the basis of these findings, it can be concluded that glucuronidation of pyrogallol-type phytophenol antioxidants has a dual effect. On the one hand, glucuronidation can decrease the antioxidant potentials (except for•O2−scavenging) and further lower the possibility of radical adduct formation (RAF), while on the other hand, it can enhance the•O2−-scavenging and Fe2+-chelating potentials.Keywords:scutellarein;scutellarin;pyrogallol-type phytophenol;structure-activity relationship;glucuronidation;antioxidant
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yujia Tong,Chenxuan Shao,Jinbo Chen,Fiona Hammond Quarcoo,Changqing Miao,Xiaohui Ju,Weixing Li
High hydrophobicity of polyvinylidene fluoride (PVDF) membrane surface results in adsorption of oil droplets and membrane fouling . A hydrogel coating with crosslinking network of polyvinyl alcohol (PVA), pyrogallol (PG) and Fe(III) based on PVDF membrane was proposed. Hydrogen bonds between PVA and PG in water were regulated by ethanol to form a uniform hydrophilic hydrogel coating on PVDF membrane. Chelation between PG and Fe 3+ significantly enhanced hydrogel adhesion. The surface energy of the developed PVDF-PVA/PG-Fe 3+ membrane was 39.96 mJ·m −2 , 2.71 times that of the pristine PVDF membrane, while its adhesion to oil is close to 0 μN. The permeate flux reached 1341 L·m −2 · h −1 at 0.1 bar for separating isooctane-in-water emulsions with good separation efficiency (>99 %) and cycling stability. The developed membrane could also effectively separate petroleum ether-in-water and dodecane-in-water emulsions.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Huanbo Wang,Yuan Fu,Yue Liu,Jinpeng Li,Xianzu Sun,Tian Liu
Dynamic covalent networks exhibit intriguing reprocessing and self-healing properties, but they usually require complex synthesis procedures and frequently use hazardous solvents. Herein, we proposed a green synthesis strategy for dynamic polyurethane that was conducted in a one-pot, solvent-free manner that addresses the aforementioned problems. A new type of low-transition-temperature mixture (LTTM) was prepared by blending pyrogallol and poly(ethylene glycol), which allowed the reagents to remain as liquids at room temperature. The formation of LTTMs was ascribed to the presence of intermolecular hydrogen-bonding and van der Waals interactions between the molecules of the two reagents. Self-healing and reprocessable dynamic polyurethane with dissociative exchangeable phenol–carbamate bonds was synthesized by incorporating a hexamethylene diisocyanate trimer as the third component into the LTTMs, followed by thermal curing. The properties of the dynamic polyurethane could be adjusted by modifying the pyrogallol content in the LTTMs. The preparation of LTTMs and dynamic polyurethane did not require any purification steps and solvents, which provides an innovative approach to polymer synthesis that is efficient and environmentally friendly.
✓ 已验证
产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2023
·
IF 7.7
Peilin Li,Jing Zhong,Wenzhong Ma,You Zhang,Xiuxiu Ren,Meng Guo,Yongfei Zhu
Carbon monoliths have the advantages of good heat resistance and no need for molding during use. However, in practical applications, due to its low strength, it often suffers from wear and breakage during multiple adsorption-desorption cycles, which is not conducive to CO 2 adsorption. Pyrogallol and formaldehyde-based polymers were used as carbon precursors, triblock copolymer Pluronic F127 was used as a structural directing agent, and diethylene glycolamine (DGA) as both the polymerization crosslinking agent and structural assembly promoter. In the presence of DGA, the solution can quickly gel within 15–20 min at 90 °C. No catalyst required, no environmental pollution, low cost, and mild reaction. Hydrogen bond interaction and poly(benzoxazine-co-resol) self-assembly synthesized homogeneous and crack-free polymer monoliths. A sturdy framework of carbon monoliths was obtained by adjusting the content of DGA and carbonization temperature. The kind of carbon monolith not only has a fully interconnected mesoporous structure and maintains good shape even after being magnified three times. The tight network skeleton enables it to have good mechanical strength and withstand a pressure of 8.1 MPa, which is 41 times greater than that of nano-casting and soft template carbon monoliths (0.19 and 0.2 MPa). The presence of nitrogen-containing groups and pore structures gives it good CO 2 capture ability (0.9–2.8 mmol/g, 1 bar, 298 K), superior to the regular mesoporous carbon prepared by soft and hard template methods (1.5 and 1.7 mmol/g). Meanwhile, it exhibits high selectivity for capturing CO 2 over N 2 from a 15% (v%) CO 2 /N 2 mixture. They undergo a facile CO 2 release in an argon stream at 25 °C, indicating a good regeneration capacity. After five testing cycles, the carbon monolith still maintained good adsorption and separation performance, with adsorption capacity maintained at 98–100% of the initial adsorption capacity.
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2021
·Vol. 307
·期 3
·2100747
·
IF 4.367
Yudi Zhao,Manlin Yuan,Litong Wang,Xin Lu,Zhong Xin
In this work, a bio-based benzoxazine monomer (C-s) is synthesized from cardanol, stearylamine, and paraformaldehyde through solvent-free method. Pyrogallol is used as a curing catalyst for the ring-opening polymerization of benzoxazine. Differential scanning calorimeter (DSC) results reveal that doping with pyrogallol reduces the exothermic peak temperature ( T p ) of C-s from 256 to 174 °C. The polybenzoxazine/pyrogallol/polyhedral oligomeric silsesquioxane (PC-s/py/POSS) nanocomposites are prepared via thermal curing. The doping of aminopropyl isobutyl POSS (POSS-NH 2 ) can reduce the dielectric constant of polybenzoxazine. The dielectric constant of PC-s/py/POSS is 2.64 at 1 MHz when the doping amount of POSS-NH 2 is 10 wt%. The results of thermogravimetric analysis (TGA) and water absorption test indicate that the PC-s/py/POSS nanocomposites possess good thermal stability and water resistance. In summary, the PC-s/py/POSS nanocomposites with low curing temperature and low dielectric constant are expected to be applied to the low dielectric materials for microelectronic applications.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Chengjiang Zuo,Lingbao Wang,Yujia Tong,Lijian Shi,Wenlong Ding,Weixing Li
Poly(vinylidene fluoride) (PVDF) has been widely used in the field of water treatment due to its outstanding chemical tolerance and excellent mechanical strength. However, PVDF membrane often suffers from oil fouling and low flux for separating oil/water emulsions because of low surface energy and strong hydrophobicity. In this work, we propose a bio-inspired biomimetic hydrophilic coating design strategy, in which pyrogallol (PG) and polyethyleneimine (PEI) are used as reactants, and NaIO 4 (SP) is used as an oxidant to modify PVDF microfiltration membrane. This strategy realized the conversion of PVDF membrane surface wettability from hydrophobic to superhydrophilic. The membrane structures and performances were investigated by SEM, FT-IR/ATR, XPS, PMI, water contact angle, pure water permeability and oil rejection for toluene-in-water emulsion. The experimental results showed that the membranes deposited with a PG/PEI mass ratio of 1:1 exhibited the best hydrophilicity and water permeation flux. PVDF-PG/PEI-0.2/0.2 was used to treat surfactant-stabilized toluene-in-water emulsion with the highest flux of 1053 L·m −2 ·h −1 at 0.1 bar and the oil rejection of 98.3%. Moreover, the flux could be wholly restored after simple washing, indicating that the modified PVDF membrane possessed good reusability. Due to the robust adhesion of PG/PEI composite coatings, the proposed strategy for preparing hydrophilic coatings holds significant potentials in the hydrophilic modification of polymer membranes.
✓ 已验证
产品关联
DOI
高影响因子
HOLZFORSCHUNG
·
2018
·Vol. 72
·期 11
·973-978
·
IF 2.079
Hui-Chao Hu,Tong Zeng,Shaokai Zhang,Lihui Chen,Liulian Huang,Yonghao Ni
A solvent-assisted and pyrogallol (PG)-protected headspace gas chromatography (HS-GC) method was developed to determine the pinene (α- and β-pinene) content in the kraft pulping black liquor (BL). Ethanol (EtOH) addition eliminated pinene’s micelles in BL by complete dissolution in the EtOH/BL medium. PG was applied to protect pinene from oxidation during the sample storage and measurement. The results showed that, with a 25% (v/v) of EtOH content and a 0.1 g of PG in 5-ml of sample solution, a rapid and stable pinene HS extraction can be obtained in 20 min at 80°C. The method has high precision with relative standard deviations within 4.2%. The sensitivity [limits of quantification (LOQ) are ~140 μg l −1 ] was high, and a good accuracy (recovery=96.0–104%) was typical for the pinene detection. The presented method is simple, rapid, accurate and is suitable for pinene quantification in biorefinery related processes and it leads to the preparation of high-value chemicals.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2025
·
IF 8.9
Kui Wang,Lu Shen,Xiang Ji,Jiale Gong,Chenchen Cui,Jiahong Xie,Liang Hong
An organic–inorganic bionic hybrid layer was created to improve the interfacial and mechanical properties of ultrahigh-molecular-weight polyethylene (UHMWPE) fiber-reinforced epoxy (UHMWPE/Epoxy) composites by utilizing the adhesion of pyrogallol and the mineralization of Cu 2+ ions. The findings indicated that the effective application of the hybrid layer introduced a significant quantity of polar groups and inorganic Cu 3 (PO 4 ) 2 particles. Mineralization treatment remarkably increased the fiber’s surface energy from 20.64 mN/m to 31.24 mN/m, achieving 51 % improvement in wettability. The interfacial interactions between the organic–inorganic hybrid layer and epoxy resin were markedly enhanced, increasing the interfacial shear strength (IFSS) from 2.38 ± 0.28 MPa to 7.62 ± 0.74 MPa. Compared with the pristine composite, the modified UHMWPE/Epoxy exhibited up to 63 %, 69 %, and 113 % improvement in mechanical performance, interlaminar shear strength (ILSS), and transverse fiber bundle tension (TFBT), respectively. Upon application of an external force, the bionic hybrid layer facilitated numerous deflections and intricate crack paths at the interface. As a result, a uniform and swift force transmission was established from the epoxy resin to the fiber.
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2018
·
IF 3.741
Runsheng Lin,Yongfei Zhu,Yongjian Zhang,Lemeng Wang,Shujuan Yu
Two kinds of pyrogallol-based di-benzoxazines (PG-FA and PG-A) with a free phenolic hydroxyl between two oxazine rings attaching to the same benzene were synthesized. The chemical structures of PG-FA and PG-A were identified by 1 H NMR, 13 C NMR and FTIR tests. The ring-opening polymerization (ROP) behavior of PG-FA and PG-A was monitored by DSC, TGA, FTIR and in situ FTIR measurements. The pyrogallol-containing benzoxazines showed latent catalytic activity as they reached melting condition. The inter- and intramolecular hydrogen bonds from the phenolic hydroxyl and oxygen or nitrogen were converted into weak OH⋯π intramolecular hydrogen bonding, which easily released the free phenolic hydroxyl. Then, the free hydroxyl could accelerate the breakage of oxazine ring. The para-position of free phenolic hydroxyl in pygarollol-based benzoxazines was preferentially polymerized with the carbocations. The temperature-dependent evolution of the chemical structure of PG-FA and PG-A on ROP was consistent with the change of hydrogen bonds.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yu Du,Yaqi Xu,Jiongrui Hou,Xueling Li,Jing Yang,Jingqin Yang,Shaoyun Shan,Chengxiao Wang,Hongying Su
Adsorbents with high adsorption capacity, selectivity, and antioxidant activity are crucial to enhance the efficacy and prognosis of hemoperfusion treatments for patients with lead poisoning. This study presents the development of polyphenol-analogous dextran hydrogels (PYG@Dex) with abundant chemically conjugated pyrogallol (PYG) groups on their networks, which were prepared by Hantzsch cross-linking reaction involving the formation of 1,4-dihydropyridine from acetoacetylated dextran, 3,4,5-trihydroxybenzaldehyde, and NH 4 OAc. The resulting PYG@Dex hydrogel exhibited superior biocompatibility and robust antioxidant capabilities, achieving a free radical scavenging rate of over 90 %. Notably, the hydrogel with high PYG content displayed an outstanding adsorption capacity of 102.35 mg·g −1 for Pb 2+ ions, due to the coordination interactions with PYG and β -ketoester groups. The adsorption affinity of PYG@Dex for Pb 2+ ions was confirmed in the presence of biologically-relevant metal ions (K + , Na + , Ca 2+ , and Mg 2+ ) in both aqueous solutions and simulated plasma. These findings underscore the potential of PYG-conjugated hydrogels to address the challenges of selective heavy metal removal from blood through hemoperfusion and to provide additional protection against heavy metal-induced oxidative stress responses.
✓ 已验证
产品关联
DOI
高影响因子
Membranes
·
2022
·Vol. 12
·期 11
·1151
·
IF 4.562
Jiawen Wu,Zhiwen Li,Qingfeng Zhou,Mercy Chigwidi,Yang Jiao,Yanchao Xu,Hongjun Lin
The co-deposition between polyphenols and amines has been demonstrated in order to prepare positively charged nanofiltration (NF) membranes for multivalent cation rejection in recent years; however, the low reactivities of the involved polyphenols usually cause a long co-deposition time and unsatisfactory rejection. Herein, a novel plant polyphenol (PG) was co-deposited with tetraethylenepentamine (TEPA) in a much shorter time period to prepare positively charged NF with high multivalent cation rejection membranes. The performance of the co-deposition membranes can be easily controlled by adjusting the mass ratio of PG and TEPA, reaction time, and pH value of the buffer solution. The optimal membrane, prepared under a polyphenol and polyamine mass ratio of 1:1, coating time of 2 h, and pH value of 8.0, shows a decent pure water permeability of 8.43 L m−2h−1bar−1while maintaining a superior 96.24% MgCl2rejection. More importantly, the universality of this method was corroborated by employing other amines with different molecular weights in the co-deposition. This work provides new insights for the preparation of high-performance positively charged NF membranes.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）