Polymer Chemistry
·
2021
·Vol. 12
·期 31
·4524-4531
·
IF 5.582
Xiaoqing Ai,Jiansen Pan,Qingyi Xie,Chunfeng Ma,Guangzhao Zhang
Hyperbranched polymers with high solubility, low viscosity, low crystallinity and dense functional groups are promising to be used in adhesives and coatings. In this study, we have developed a cleavable hyperbranched poly(ester-co-vinyl) with diethylene glycol units and unreacted pendant vinyl groups via radical ring-opening copolymerization of 2-methylene-1,3-dioxepane (MDO), vinyl acetate (VAc) and diethylene glycol divinyl ether. Such a hyperbranched polymer with vinyl groups can form a crosslinked network by UV curing. The cleavable ester bonds are randomly distributed in the main chain, so they can degrade into small fragments with molar masses of 400–600 g mol−1. The degradation rate can be well regulated with MDO content. The protein resistance, antibacterial adhesion and anti-diatom activity of the hyperbranched polymer were examined. The polymer with diethylene glycol units exhibits remarkable antifouling abilities and can effectively inhibit the adhesion of protein, marine bacteria (Pseudomonas sp.) and diatoms (Navicula incerta). The hyperbranched polymer coating can find application in marine antifouling.
研究领域:
材料科学
·
海洋生物学
·
高分子化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Bingfei Nan,Luqi Xiao,Kun Wu,Chang-an Xu,Ending Zhang,Haoting Zheng,Yingjie Zhan,Qiang Zhang,Jun Shi,Mangeng Lu
Polymer-based thermal management nanocomposites with favorable electrical insulation have received increasing attention in the microelectronics industry. How to effectively disperse nanofillers and improve interfacial compatibility with polymer matrix is crucial to enhance comprehensive performance of nanocomposites. In this work, nanodiamond (ND) was first oxidized by hydrogen peroxide and then amino groups generated on its surface via hydrothermal reaction in the presence of ethylenediamine. Amino-functionalized ND particles (ND-NH 2 ) were covalently incorporated into isocyanate-terminated polyurethane prepolymer chains via in situ polymerization, and a series of waterborne polyurethane (WPU)/ND-NH 2 (WPN) nanocomposites with low loading levels (0.5, 1 and 2 wt%) were successfully prepared. ND functionalized with amino groups achieved excellent compatibility with the WPU matrix, improving the interfacial interactions between filler and matrix, and reducing the interface thermal resistances and phonon scatterings, further favoring the formation of thermal conductive paths. The highest thermal conductivity of the WPN nanocomposite with a lower ND-NH 2 loading of 2 wt% was 0.369 W m −1 K −1 , which is about 82% higher than that of the pure WPU film (0.203 W m −1 K −1 ). The excellent electrical insulation was also found at 2 wt% nanofiller content and the volume electrical resistivity reaches 2.525 × 10 15 Ω·cm. Moreover, the incorporating and good dispersion state of ND particles in the WPU-based nanocomposites could increase the thermal stability and mechanical performance of the nanocomposite films. This method provides an effective and promising way to prepare environmentally friendly polyurethane nanocomposites reinforced with reactive surface of functionalized ND.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 12
·1-9
·
IF 3.097
Li Mengqing,Zhang Yudong,Zhu Fang,Zhao Xinrui,Li Runming,Wang Hongxia,Liu Jichun,Li Xiying,Chang Haibo,Lin Tong
Poly(ε-caprolactone) ( PCL)/polyamide 6 (PA6) composites were fabricated by dispersing PA6 powder into PCL. The SEM results show good dispersion of PA6 in the PCL matrix. Crystallization behavior, crystal structure and spherulitic morphology of pure PCL and the PCL/PA6 composites, as well as their thermal stability and dynamic mechanical properties, were characterized using various techniques including differential scanning calorimeter, X-ray diffraction (XRD), polarized light microscope (PLM), thermal gravimetric analysis (TGA) and dynamic mechanical analyzer (DMA). The PCL/PA6 composite showed increased storage modulus and glass transition temperature (T g ). PA6 powder functions as a heterogeneous nucleate to promote PCL crystallization but does not alter orthorhombic crystal form, crystallization mechanism and thermal stability of PCL.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
FIBERS AND POLYMERS
·
2022
·Vol. 23
·期 9
·2638-2647
·
IF 2.347
Xie Yan,Lu Shaofeng,Shi Wenzhao,Wang Haizhu,Wang Kuang
Water-based polyurethane (WPU) provides a number of benefits over typical solvent-based polyurethane. WPU is more environmentally friendly, safe, and reliable. The WPU with polycaprolactone diol/polycarbonate diol (PCL/PCDL) complex soft segment was developed using a prepolymer technique to enhance the color depth of cotton knitted fabrics dyed with reactive dyes. The appearance, particle size, zeta potential, and viscosity of WPU emulsions were analyzed. The chemical structure, thermal stability, phase change performance, and topography of WPU films were characterized by Fourier-transform infrared (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and atomic force microscopy (AFM), respectively. The tensile and hydrophilic properties of the WPU films were examined by an electronic universal testing machine and contact angle goniometer, respectively. The K / S value, rubbing fastness, washing fastness, and wearability of finished and unfinished dark cotton knitted fabrics were measured. Simultaneously, the chemical structure and morphology of fabrics were investigated using FTIR and scanning electron microscopy (SEM). The results show the WPU-2 emulsion demonstrated excellent stability, and the WPU-2 film showed superior thermal stability. The K / S value of the dark cotton knitted fabric finished with WPU-2 emulsion (40 g/ l ) increased by 18.58 %, and the wet rubbing color fastness of the resulting fabric was enhanced. The SEM results show a layer of film covered the surface of the finished fabric. In summary, the WPU can provide a new technique for enhancing the color depth of fabrics.
研究领域:
材料科学
·
纺织工程
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 1
·337-350
·
IF 3.553
Ning Yu-Jie,Zhu Ze-Ru,Cao Wei-Wei,Wu Lei,Jing Li-Chao,Wang Tao,Yuan Xiao-Tong,Teng Ling-Hong,Bin Peng-Shuai,Geng Hong-Zhang
The research and preparation of excellent anti-corrosion coatings is still a difficult task and critical to practical applications. In this paper, phosphoric acid, dodecylbenzenesulfonic acid (DBSA), and polyaniline (PANI) were polymerized in-situ onto graphene oxide (GO) by the one-pot method to prepare dodecylbenzenesulfonic acid-PANI/phosphorylated graphene oxide (DPPGO). The results of TEM, FTIR, Raman spectrum, XRD, TGA, and XPS analysis showed that the DPPGO was successfully prepared. The SEM observations showed that DPPGO has best dispersibility and compatibility than GO and PANI/phosphorylated graphene oxide (PPGO) in waterborne polyurethane (WPU) matrix. To achieve anti-corrosion performance, a new type of graphene-based polymer nanocomposites water-based coating was developed and tested by electrochemical measurements. Through a series of electrochemical tests, it is concluded that the anti-corrosion performance of a composite coating DPPGO is significantly improved. The excellent anti-corrosion properties are due to the perfect dispersion and good compatibility of DPPGO in WPU.
研究领域:
材料科学
·
化学工程
·
表面工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 9
·5265-5274
·
IF 4.036
Han Tao,Feng Liu,Chun Ji,Yuangen Wu,Xiao Wang,Qili Shi
Similar to acetylcholinesterase, the activity of plant-derived esterase can also be inhibited by organophosphorus pesticides. Therefore, an electrochemical sensing platform using kidney bean esterase as a new detection enzyme was proposed for the highly sensitive determination of organophosphorus pesticides. Purified kidney bean esterase was obtained by an efficient and economical aqueous two-phase extraction method. Carboxylated graphene/carbon nanotube composites (cCNTs–cGR) and Au nanoparticles were used to provide a biocompatible environment to immobilize kidney bean esterase and also accelerate electron transport between the analyte and the electrode surface. Due to the good synergistic electrocatalytic effects of these nanomaterials, the biosensor exhibited an amplified electrocatalytic response to the oxidation of α-naphthalenol, which makes the sensor more sensitive. Based on the inhibitory effect of trichlorfon on kidney bean esterase activity, high sensitivity and low-cost detection of trichlorfon was achieved. Under optimum conditions, the inhibition of trichlorfon is proportional to its concentration in the range of 5 to 150 ng L−1 and 150 ng L−1 to 700 ng L−1 with an ultra-low detection limit of 3 ng L−1. Moreover, the validity of the prepared biosensor was verified by analyzing several actual agricultural products (cabbage and rice) with satisfactory recoveries ranging from 94.05% to 106.76%, indicating that kidney bean esterase is a promising enzyme source for the analysis of organophosphorus pesticides in food samples.
研究领域:
生物化学
·
环境科学
·
食品科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 34
·50853
·
IF 3.125
Junzhi Ma,Dong Wang,Shaohai Fu
To improve flame-retardant properties of unsaturated polyester resin (UPR), two phosphorus-containing vinyl monomers with different chemical structures were synthesized to replace styrene molecules and then copolymerized with UPR oligomers to prepare flame-retardant phosphatized UPRs. Curing behavior of phosphatized UPRs was investigated by DSC non-isothermal curing curves, deducing the best curing conditions. Cone calorimeter results demonstrated the obvious reduction of heat release rate and smoke production rate by comparing phosphatized UPRs with flammable UPR. TG-IR-MS coupling technique was utilized to reveal thermal degradation and pyrolytic volatiles including aromatic compounds, hydrocarbons, CO, PO 4 ˙, and so forth, providing more information of smoke toxicity and the gas phase flame- retardant mechanism of phosphatized UPRs. Moreover, the yield, compactness and graphitic degree of char residues of phosphatized UPRs were increased, strengthening the barrier effect to inhibit the permeation of combustion heat and the effusion of pyrolytic volatiles in the condensed phase.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2022
·
IF 4.778
Jia Chen,Zhihong Liu,Jiyan Liu,Xueqing Liu,Xue Yang,Xueliang Jiang
An effective approach is proposed to enhanced the safety of lithium batteries by an intrinsic flame-retardant polyurethane (FR-PU) solid electrolyte , which is constructed by ethylene glycol methyl phosphonate ethylene glycol propionate (EMPEP), polyethylene glycol 800 (PEG800) and hexamethylene diisocyanate (HDI) through a simple polymerization reaction. The FR-PU not only displays benign flame retardancy with the limit oxygen index value of 27.6, but also exhibits excellent flexibility, sufficient mechanical strength and heat resistance which are beneficial to their dimensional stability. Infrared spectroscopy results reveal the complicated coordination relationship between FR-PU and lithium ion . The ionic conductivity of solid electrolyte with FR-PU containing 20 wt% lithium bis-(trifluoromethanesulfonyl)imide (LiTFSI) can up to 1.51 × 10 −4 Scm −1 at 70 °C. The FR-PU-20% Li solid electrolyte possesses a wide electrochemical stability window of 0–4.81 V (vs. Li + /Li). Moreover, the cells which fabricated with lithium iron phosphate (LiFePO 4 ), FR-PU-20% Li, and Li anodes exhibits both superior discharge specific capacity and cycle performance (discharge specific capacity of 155.1 mAhg −1 and coulombic efficiency of 98.3% after 120 cycles at the rate of 0.2 C) at 70 °C. Therefore, FR-PU could be a promising candidate as a high performance polymer electrolyte to improve the safety of lithium batteries .
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Zehong Wang,Wei Wang,Zhikang Jiang,Dan Yu
Flexible conductive circuits on PET fabrics were fabricated by a simple approach. Firstly, well dispersed nano-silver colloids with average size of 87 nm were synthesized with poly (vinyl pyrrolidone). Then, by adding polyurethane and thickening agent into these colloids, Ag NP-based ink was produced and printed on PET fabrics by screen printing. Conductive patterns were achieved through the swelling process of polyurethane and the decrease of contact resistance between nano-silver particles when immersed in dichloromethane (DCM) and diallyldimethylammonium chloride (DMDAAC) mixed solution. After it was dried at 40 °C,the surface resistivity was about 0.197 Ω cm with width 1.9 mm, and thickness 20 μm. Moreover, the effects of different DCM contents on the conductivity and the film forming ability have been investigated. We believe these foundings will provide some important analysis for printing flexible conductive circuits on textiles.
研究领域:
材料科学
·
纺织工程
·
电子制造
✓ 已验证
DOI
高影响因子
ChemElectroChem
·
2017
·Vol. 5
·期 4
·637-642
·
IF 4.136
Zhaohan Hao,Feng Tao,Zhikui Wang,Ximing Cui,Qinmin Pan
Graphical Self-help : An omni-healable aqueous lithium-ion battery, fabricated by integrating all of the electroactive components into polymer networks cross-linked through dynamic borate ester bonding, can self-repair its electrodes and electrolyte simultaneously after mechanical breakage. It can also be tailored into complicated patterns without significant deterioration in lithium-storage properties. Reliability and safety are critical issues for portable power sources aiming for next-generation electronics. However, most lithium-ion batteries (LIBs) will fail to work or will cause safety problems after physical damage or violent deformation. Here, an omni-healable aqueous LIB, which can self-repair its electrodes and electrolyte simultaneously after mechanical breakage, is fabricated by integrating all of the electroactive components into polymer networks cross-linked by dynamic borate ester bonding. Once suffering from repeated cutoffs, the battery quickly recovers its configuration integrity as well as mechanical and electrochemical properties autonomously without external stimuli. Furthermore, the battery can also be tailored into complicated patterns while maintaining its lithium-storage properties. The present investigation offers a strategy to design a smart and sustainable energy-storage device that has potential applications in wearable/flexible electronics, flexible robot or intelligent apparel, and so on.
研究领域:
材料科学
·
能源存储
·
智能设备
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Han Hu,Jiayi Li,Shenggan Luo,Ying Tian,Jinggang Wang,Yi-Lei Zhao,Ruoyu Zhang,Jin Zhu
Nowadays, the promotion and application of aliphatic-aromatic copolyesters, such as poly (butylene adipate–co–terephthalate) (PBAT), are growing into a general trend. Although the structures of diacids exerted substantial impacts on degradation behavior, the underlying mechanisms have rarely been studied. In this work, 2,5-Furandicarboxylic acid was combined with succinic acid (PBSF), adipic acid (PBAF) and diglycolic acid (PBDF) to prepare three kinds of copolyesters. They showed unique degradation behaviors in buffer, enzyme environment and artificial seawater. These characteristics are closely related to the structural compositions of diacids. PBAFs displayed impressive biodegradability when catalyzed by Candida antarctica lipase B (CALB), while the more hydrophilic PBDFs exhibited faster hydrolysis in both buffer and artificial seawater. PBSFs, with hydrophobic and short segments, obtained a relatively slower rate of hydrolysis and enzymatic degradation. The reactivity sites and hydrolytic pathway were revealed by the combination of DFT calculation and Fukui function analysis. MD simulations, QM/MM optimizations and theozyme calculations showed that PBAF-CALB was prone to form a pre-reaction state, leading to the reduced energy barrier in the acylation process. This work revealed the effects of different structural features of diacids on polymer degradation and paved a way to design target biodegradable polymers in different degradation conditions.
研究领域:
材料科学
·
环境科学
·
生物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 11
·48473
·
IF 2.188
Desheng Qi,Jiayu Wang,Yugang Qi,Jing Wen,Shu Wei,Dajun Liu,Shuangjiang Yu
In this work, we present a new type of glutathione (GSH)-responsive polyurethane-based core‑shell nanogels (RS-CS-PUNGs) with hydrophilic methoxypolyethylene glycols (mPEG) shell, which was prepared by a one-pot synthetic method. The obtained RS-CS-PUNGs not only show a good size distribution with the hydrodynamic radii around of 20 nm, but also exhibit good stability in the organic solvent. The results demonstrate that GSH (10 mM) trigger the nanogel swelling and accelerate the loaded drug release in PBS (pH = 7.4). Although the RS-CS-PUNGs loaded with DOX show a slower cellular uptake behavior than the free doxorubicin (DOX), which is likely caused by the controlled drug release property of the nanocarrier, the enhanced cellular uptake fluorescence intensity of RS-CS-PUNGs loaded with DOX is still observed compared to the control group. Both MTT and CCK-8 assay indicate that although an obvious lower initial cytotoxicity is observed compared to free DOX at 24 h postincubation, the cytotoxicity of the RS-CS-PUNGs loaded with DOX is obvious enhanced after treated 72 h, which stayed at the similar level with free DOX. Attributing to the easy preparation progress and GSH-responsive property, RS-CS-PUNGs maybe hold the potential for further application in the field of drug delivery. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48473.
研究领域:
材料科学
·
药学
·
生物医学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）