RSC Advances
·
2013
·Vol. 4
·期 1
·510-515
·
IF 2.562
Huan Wang,Baoqing Shentu,Zhixue Weng
A one-pot synthetic approach for the preparation of poly(2,6-dimethyl-1,4-phenylene oxide)/polystyrene (PPO/PS) alloy in aqueous medium was developed. The method was based on the combination of the oxidative coupling polymerization of 2,6-dimethylphenol (DMP) to form PPO in the presence of a reactive swelling agent, styrene (St), and in situ reverse atom transfer radical polymerization (RATRP) of St initiated by 2,2′-azobis[2-(2-imidazolin-2-yl)propane] dihydrochloride (AIBI) in alkaline aqueous solution. The complex of CuCl2 and 4-dimethylaminopyridine (DMAP) was utilized as the catalyst to catalyze the two types of polymerization mentioned above. Oxygen was employed as the sole oxidant to synthesize PPO. The introduction of St during the oxidative polymerization of DMP could increase the molecular weight of PPO. Finally thermodynamically compatible PPO/PS alloy was successfully prepared.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 43
·18562-18573
·
IF 0
Lijia Yang,Beibei Tang,Peiyi Wu
In this work, graphene oxide (GO) was first functionalized with branched polyethyleneimine (PEI). The obtained PEI–GO was incorporated into a brominated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO) matrix by a covalent bond interaction to form a cross-linking network. Then, a novel ultrafiltration (UF) membrane was prepared via casting and phase-inversion methods. The PEI–GO/BPPO membrane showed highly improved water flux, which was almost 6 times higher than that of the pristine BPPO membrane and 2.5 times higher than that of the GO/BPPO membrane, whereas the rejection of PEI–GO/BPPO membrane was still maintained at a high level. The improvement of membrane performance could be attributed to the special property of PEI–GO and the interactions between PEI–GO and the BPPO matrix. First, a cross-linking network of PEI–GO/BPPO membrane was formed because of the reaction between PEI–GO and the BPPO matrix to provide passageways for water rapidly passing through. Second, the high hydrophilicity of PEI–GO could accelerate the exchange rate between solvent and non-solvent, resulting in a rougher and more hydrophilic surface, higher porosity and a more porous structure. Third, the good dispersion and compatibility of PEI–GO promoted the formation of a uniform structure with fewer defects. Proper molecular weight of PEI was very important for the modification of GO, subsequently resulting in an overall enhancement in membrane performance. Anti-fouling experiments and stability tests of the membranes were also conducted. All of these results were confirmed by various characterizations, such as SEM, TEM, AFM and, etc.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Feng Su,Peng Yun,Chenglong Li,Rongye Li,Laishun Xi,Yuandou Wang,Yangsheng Chen,Suming Li
A series of poly(2-ethyl-2-oxazoline)-poly(L-lactide) (PEOz-PLA) diblock copolymers were synthesized by ring-opening polymerization of l -lactide using a monohydroxy terminated PEOz-OH macro-initiator in the presence of stannous octoate as catalyst. The resulting diblock copolymers were characterized by 1 H nuclear magnetic resonance and gel permeation chromatography . Self-assembled micelles were prepared using the co-solvent evaporation method in water and in phosphate buffered saline (PBS) at pH 7.4, 6.5 and 5.0. The resulting micelles exhibit different morphologies, such as spherical micelles and worm-like micelles depending on the hydrophilic/hydrophobic balance. Spherical micelles were exclusively observed for PEOz-PLA copolymers with short PLA blocks, whereas co-existence of worm-like and spherical micelles was observed for copolymers with long PLA blocks. The micelle size increases with decreasing pH due to the electrostatic repulsion between PEOz chains resulting from ionization of the tertiary amide groups along PEOz chains. A hydrophobic anti-tumor drug, paclitaxel , was entrapped in PEOz-PLA micelles. High loading efficiency up to 86.7% was obtained for copolymers with long PLA blocks. Drug release was performed in PBS at different pH values. During the 30-day release period, faster release was obtained for copolymers with shorter PLA blocks than for copolymers with longer PLA blocks, at acidic pH than at pH 7.4. It is thus concluded that pH-responsive PEOz-PLA copolymer micellss could be promising as carrier of anti-tumor drugs.
研究领域:
生物材料学
·
药剂学
·
高分子化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Hailong Yang,Hantian Lu,Yueyue Miao,Yang Cong,Yubin Ke,Jun Wang,Hua Yang,Jun Fu
Non-swelling super-tough polymer hydrogels have great potentials for stable applications in wet conditions. It has been challenging since most polymer hydrogels uptake water from the environment and swell, which deteriorates the mechanical strength and toughness. Here, we present multi-responsive non-swelling polymer hydrogels ( PHFGs ) by using amphiphilic triblock copolymer micelles as non-covalent crosslinkers. Pluronic F127 (or polyethylene oxide- block -polypropylene oxide- block -polyethylene oxide, PEO-PPO-PEO) (F-127) micelles are used as a prototype for the synthesis of micelle-crosslinked poly-(2-hydroxyethylene methacrylate) (PHEMA) hydrogels, without using any modification of F-127 or other crosslinkers. FT-IR and 1 H NMR studies provide first evidence that F-127 micelles form extensive hydrogen bonding and hydrophobic association with PHEMA chains. The non-covalent crosslinked hydrogels show a high fracture elongation about 460 %, a fracture strength about 240 kPa, and a fracture toughness about 660 kJ/m 3 . Negligible swelling is observed for the polymer hydrogels in aqueous solutions. The hydrogels are self-healable, and responsive to variations in pH or water content to change volume, shape, and transparency. Such multiple-responsive polymer hydrogels are utilized as smart switches and shape memory materials that are actuated by environmental stimuli in a controllable manner.
研究领域:
材料科学
·
高分子化学
·
智能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2018
·Vol. 33
·期 1
·212-220
·
IF 0.524
Liu Qingting,Ni Na,Sun Quan,Wu Xiaoxue,Bao Xujin,Fan Zhang,Zhang Rong,Hu Shengfei,Zhao Feng,Li Xiao
Novel organic-inorganic composites were in-situ synthesized by using TriSilanolPhenyl polyhedral oligomeric silsesquioxane (SO-POSS) as fillers and poly(2,5-benzimidazole) (ABPBI) as polymer matrix. The uniformly dispersed 3% SO-POSS particles in ABPBI matrix increased the thermal stability of the composite membranes. It was found that both the water and H 3 PO 4 uptakes were increased significantly with the addition of SO-POSS due to the formation of hydrogen bonds between the POSS and H 2 O/H 3 PO 4 , which played a critical role in the improvement of the conductivity of the composite membranes at temperature over 100 °C. Proton conductivities of H 3 PO 4 doped with 3wt% SO-POSS contained ABPBI membranes increased with the increase of H 3 PO 4 absorbance, reaching the maximum proton conductivity of 2.55 × 10 -3 S·cm -1 at 160 °C, indicating that the ABPBI/SO-POSS composite membrane could be a promising candidate for mid-temperature PEMFCs.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 13
·2748
·
IF 4.967
He Xi,Zhicheng Song,Yonggang Guo,Weijia Zhu,Lisong Ding,Weidong Zhu,Dazheng Chen,Chunfu Zhang
To promote the performance of perovskite solar cells (PSCs), its theoretical power conversion efficiency (PCE) and high stability, elaborative defect passivation, and interfacial engineering at the molecular level are required to regulate the optoelectric properties and charge transporting process at the perovskite/hole transport layer (HTL) interfaces. Herein, we introduce for the first time a multifunctional dipole polymer poly(2-ethyl-2-oxazoline) (PEOz) between the perovskite and Spiro-OMeTAD HTL in planar n-i-p PSCs, which advances the PSCs toward both high efficiency and excellent stability by stimulating three beneficial effects. First, the ether–oxygen unshared electron pairs in PEOz chemically react with unsaturated Pb2+on the perovskite surfaces by forming a strong Pb–O bond, which effectively reduces the uncoordinated defects on the perovskite surfaces and enhances the absorption ability of the resulting PSCs. Second, the dipole induced by PEOz at the perovskite/HTL interface can decrease the HOMO and LUMO level of Spiro-OMeTAD and optimize the band alignment between these layers, thereby suppressing the interfacial recombination and accelerating the hole transport/extraction ability in the cell. Third, the hygroscopic PEOz thin film can protect perovskite film from water erosion by absorbing the water molecules before perovskite does. Finally, the PEOz-modified PSC exhibits an optimized PCE of 21.86%, with a high short-circuit current density (Jsc) of 24.88 mA/cm2, a fill factor (FF) of 0.79, and an open-circuit voltage (Voc) of 1.11 V. The unencapsulated devices also deliver excellent operation stability over 300 h in an ambient atmosphere with a humidity of 30~40% and more than 10 h under thermal stress.
研究领域:
材料科学
·
光伏技术
·
界面工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2012
·
IF 4.951
Suqing Di,Liuming Yan,Shuaiyuan Han,Baohua Yue,Qingxia Feng,Liqing Xie,Jin Chen,Dongfang Zhang,Chao Sun
The boron phosphate-poly(2,5-benzimidazole) (or BPO 4 –ABPBI) nanocomposite proton exchange membranes were prepared by preblending BPO 4 nanoparticles to the 3,4-diaminobenzoic acid solution before its polycondensation . The phosphoric acid doped nanocomposite membrane possesses enhanced proton conductivity compared to the phosphoric acid doped pristine ABPBI membrane without BPO 4 nanoparticles; and a maximum proton conductivity of 27.3 mS cm −1 was observed in the phosphoric acid doped nanocomposite membrane consisting of 25% BPO 4 nanoparticles at 180 °C under anhydrous condition. The enhancement of proton conductivity is attributed to the dangling hydroxyl or geminal hydroxyl groups of the excess phosphoric acid molecules on surface of the BPO 4 nanoparticles based on density functional theory calculations. In addition, the blending of BPO 4 nanoparticles significantly decreases the methanol vapor permeability through the membrane by about two-fold.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Xiao Song,Chuanjiang Zhou,Shengjie Liu,Zhaoqiang Wu,Hong Chen
Although polycarbonate (PC) is widely used in various applications, its inherent hydrophobicity limits its potential in applications that require high light transmittance due to surface fog caused by changes in temperature or humidity in the environment. This work presents a facile method to fabricate transparent antifogging coatings on PC substrates based on poly(2-hydroxyethyl acrylamide- co -2-aminoethyl methacrylate) (P(HEAA-co-AEMA)), in which the AEMA segments have an amino functional group that can react with the ester group on the surface of the PC substrate to form covalent urethane bonds during the heat curing process, avoiding the problems of coating susceptibility to mechanical damage, ease of peeling, etc. Moreover, HEAA units are employed as hydrophilic groups , providing antifogging performance. These antifogging coatings can be easily obtained by coating P(HEAA-co-AEMA) copolymers on PC substrates at room temperature and then curing them by thermal treatment. These transparent coatings exhibited excellent antifogging and self-cleaning performance. Furthermore, the coatings exhibited good adhesion in the cross-cut test and thermal stability in the hot water resistance test. Therefore, the present P(HEAA-co-AEMA) copolymer coatings are promising for practical antifogging applications.
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
Journal of Materials Chemistry B
·
2012
·Vol. 1
·期 7
·978-986
·
IF 0
Jintang Zhu,Jianwu Wang,Qianyun Liu,Yahui Liu,Lei Wang,Changcheng He,Huiliang Wang
This work reports a novel method for fabricating anisotropic hydrogels starting from monomers by combining directional freezing and redox polymerization (DFRP), and poly(2-hydroxyethyl methacrylate) (PHEMA) hydrogels with anisotropic porous structures and mechanical properties are obtained. Scanning electron microscopy (SEM) investigations show that the hydrogels have long and wide (up to several tens of micrometers) aligned channels in the direction parallel to the freezing direction, and pores in the perpendicular direction. The sizes of the channels and pores decrease with increasing freezing rate. Tensile, compressive and tearing tests show that the hydrogels (70 wt% water content) show very good mechanical properties, with tensile strength up to 0.44 MPa, compressive strength more than 20 MPa, and fracture energy up to 1000 J m−2. More importantly, the hydrogels exhibit significant anisotropy in their mechanical properties, which are better in the parallel direction. The hydrogels also show different swelling behaviour in comparison with conventional synthetic hydrogels. The anisotropic tough PHEMA hydrogels may find further application.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
Journal of Materials Chemistry B
·
2015
·Vol. 3
·期 27
·5615-5628
·
IF 4.726
Chong Zhang,Songtao Liu,Lin Tan,Haikun Zhu,Yanmei Wang
Development of surfaces with antifouling properties is of great interest in biomedical applications. In this paper, the research was aimed at rapid preparation of poly(2-methyl-2-oxazoline)-based antifouling coating. We designed and synthesized a set of well-defined multiarm star copolymers hyperbranched poly(ethylenimine)-graft-poly(2-methyl-2-oxazoline) (PEI-g-PMOXA) with different PMOXA grafting ratios and chain lengths. The cytotoxicity of the polymer was tested and the PMOXA-based films were successfully deposited rapidly onto substrates via a simple one-step dopamine-assisted codeposition method. The effect of polymer architecture (linear PMOXA with different molecular weights, star PMOXA with different PMOXA grafting ratios and arm lengths) on deposited films with respect to their deposition kinetics, surface composition, wettability, morphology, cytotoxicity, and antifouling properties was investigated systematically. The antifouling properties of PMOXA-based films were found to be dependent on the surface PMOXA chain densities, which were controlled by the PMOXA grafting ratios and chain lengths. Moreover, the star PMOXA structures gave the surfaces with higher PMOXA chain densities and enhanced antifouling properties compared to the linear ones. Among the star copolymers, PEI-g(70)-PMOXA(5K)/polydopamine and PEI-g(70)-PMOXA(7K)/polydopamine deposited films showed the highest resistance to protein adsorption (96–99% relative to the bare gold surface) and cell attachment (97–99% relative to the bare glass surface), as well as complete inhibition against platelet adhesion. At last, the stability test results showed that the PMOXA-based film exhibited superior stability in long-term applications than the poly(ethylene glycol)-based film.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Xiaoxiao Zhang,Qingting Liu,Lei Xia,Dongyang Huang,Xudong Fu,Rong Zhang,Shengfei Hu,Feng Zhao,Xiao Li,Xujin Bao
To broaden the operating temperature range of phosphoric acid (PA) doped polybenzimidazole membrane-based proton exchange membrane fuel cells (PEMFCs) toward low temperatures, a novel series of poly(2,5-benzimidazole) (ABPBI)/sulfonated sepiolite (S-Sep) composite membranes (ABPBI/S-Sep) with low PA doping levels (DLs) were prepared via in-situ synthesis. The desirably enhanced mechanical, thermal, and oxidative stabilities of ABPBI/S-Sep composite membranes were achieved by constructing ABPBI chains arranged along the sepiolite (Sep) fibers and acid-base crosslinks formed between S-Sep fibrous particles and ABPBI chains. Benefiting from the richness of high temperature stable bound water and the excellent water absorbability of Sep particles that enable the formation of additive proton conducting paths, the composite membranes retained bounded PA and achieved much higher proton conductivities under both anhydrous and hydrous conditions compared to PA-doped ABPBI membranes. Proton conductivity values above 0.01 S/cm at 40–90 °C/20–98% RH conditions and 90–180 °C/anhydrous conditions as well as peak power density of 0.13 and 0.23 W/cm 2 at 80 and 180 °C with 0% RH, respectively from the ABPBI/2S-Sep composite membrane are more holistic compared to Nafion at low temperatures and polybenzimidazole-based membranes at high temperatures, respectively. The excellent properties of ABPBI/S-Sep composite membranes suggest them as prospective candidates for PEMFCs applications in a wide temperature range.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zimin Cai,Fangqin Fu,Sifeng Zhu,Jibin Wu,Xu Han,Shuai Jiang,Zhiyong Qian,Cheng Wang
The pharmacokinetic behavior of nanocarrier in vivo has been confirmed to be greatly influenced by the dynamic protein corona covered its surface, which also affects the ultimate clinical efficacy. Herein, we explored one novel polymersomes based on Poly(2-methyl-2-oxazoline) polymers (PMOXA 5 -PDBH 13 -PMOXA 5 ) with excellent drug-carrying capacity and specific protein corona manipulation. Compared to PEGylated nanoparticle (NP), the polymersomes (PC-SOM) provided a considerable advancement in therapeutic efficiency, which can selectively accumulate in tumor tissues, enhancing cellular internalization via specific proteins covering its surface such as fibronectin and moesin. Notably, in vivo antitumor effect showed that doxorubicin-loaded PC-SOM exhibited superior inhibitory rate 75.5% than 48.24% of PEGylated NP. Furthermore, through protein corona analysis we found that PC-SOM enhanced the adsorption of apolipoprotein A-I while suppressed the adsorption of complement C3 and immunoglobulin in serum from healthy volunteers and human breast cancer volunteers. These elaborated the reasons of longer circulation times and superior tumor-targeting capabilities of PC-SOM. Our work provided a promising nanoagent with novel surface-design by the dynamic protein corona for excellent pharmacokinetic behavior and antitumor effect.
研究领域:
生物医学工程
·
药理学
·
纳米医学
✓ 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）