Journal of Natural Fibers
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2023
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IF 3.5
Yanan Wang,Hao Xu,Lijie Huang,Xiaoxue Han,Zhehao Wei,Qi Mo,Xiyue Wang,Yishan Li
Fiber reinforcement is the most common method for modifying polylactic acid (PLA). However, poor compatibility between fibers and PLA, especially at high cellulose contents, can promote cellulose agglomeration in the continuous phase, which damages the mechanical properties of composite materials. To address these issues, bagasse cellulose (BC) was used as a substrate and bifunctional glycidyl methacrylate (GMA) was used as a reactive monomer for graft modification. GMA-modified BC (BC-GMA)/PLA composite materials with different particle sizes were prepared using a blending grafting method, and the influence of the type and content of BC-GMA on the mechanical properties of the composite materials was explored. During the grafting modification of BC, a longer reaction time was found to result in smaller BC particles and a higher degree of grafting. For BC-GMA, the degree of grafting reached 27.02% with a maximum thermal decomposition temperature of 359.31°C. Furthermore, the BC-GMA/PLA composite material had a greater relative crystallinity of PLA, indicating that BC-GMA was evenly dispersed in the continuous phase. This study demonstrates that grafting modification can successfully achieve high cellulose loading in composite materials and thus reduce the production costs of PLA-based packaging materials.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CHEMICAL PAPERS
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2024
·Vol. 78
·期 8
·4827-4839
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IF 2.1
Zhang Zhijian,Luo Wenjun
A novel monolithic amidogen-rich biomass adsorbent was successfully prepared. Corn bract (CB) was employed as adsorbent matrix, and arginine (Arg) was selected as a bonding bridge between the hydroxyls on cellulose that came from CB and modifier molecules to enrich reactive sites and improve reaction activity. Polyethyleneimine (PEI) was then grafted to the surface of CB in a heterogeneous reaction. The resultant CB-g-PEI (CB-grafted-PEI) held a grafting ratio of 60.6%. And the maximum adsorption for (acid red 18) AR18 was reached 506.7 mg/g. As a necessary content of adsorption behavior research, models about isotherm adsorption, adsorption kinetics and adsorption thermodynamics were all inspected. According to the research conclusions obtained, the pseudo-second-order model provides the best explanation for the kinetics of adsorption. The adsorption isotherm of AR18 is in better agreement with the Langmuir isotherm model. The adsorption and desorption experiments were conducted over 6 times. The samples were characterized using FT-IR, SEM and EDS. The study suggests that the CB-g-PEI is an available adsorbent. Graphical abstract
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CARBOHYDRATE POLYMERS
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2014
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IF 3.916
Jingchun Lv,Qingqing Zhou,Guoliang Liu,Dawei Gao,Chunxia Wang
Carboxymethyl chitosan (CMCS) was prepared with a view to develop a multifunctional finish on saponified polyethylene terephthalate (PET) fabric. CMCS was synthesized by chemical reaction with chloroacetic acid, and its chemical structure was characterized by Fourier Transform Infrared Spectrum (FTIR) and nuclear magnetic resonance (NMR). CMCS was grafted on saponified PET fabric using 3-(3-dimethylaminopropyl)-1-ethylcarbodiimide hydrochloride (EDC)/N-hydroxysuccinimide (NHS) and polyethylenimine (PEI)/glutaraldehyde (GA) as cross-linking agent. FTIR, scanning electron microscope (SEM) and energy dispersive X-ray (EDX) analyses confirmed CMCS grafting on saponified PET fabric surface. TGA indicated saponification and CMCS grafting did not affect thermal property of PET fabric. The CMCS grafting greatly improved wettability, antistatic property of saponified PET fabric without harmful effect on their physico-mechanical properties.
研究领域:
材料科学
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纺织工程
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高分子化学
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DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS B-ENZYMATIC
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2015
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IF 2.128
Ruirui Liu,Aixue Dong,Xuerong Fan,Qiang Wang,Yuanyuan Yu,Artur Cavaco-Paulo
The horseradish peroxidase (HRP)/hydrogen peroxide system can catalyze the free-radical polymerization of aromatic compounds such as lignins. In this study, to improve the hydrophilicity of lignin-rich jute fabrics, acrylamide (AM) was grafted onto their surface by HRP-mediated oxidative polymerization. The resulting AM-lignin graft polymer in jute fibers, from which the lignin was removed by extracting with dioxane, was characterized by gel permeation chromatography, elemental analysis, matrix-assisted laser desorption/ionization mass spectrometry, nuclear magnetic resonance, scanning electron microscopy, and Fourier transform infrared spectroscopy. The results show that AM was grafted to the jute fiber by HRP . Furthermore, the hydrophilicity of the fabrics was determined in terms of wetting time, balance moisture regain, and static contact angle. Compared to the control sample, the wetting time, balance moisture regain, and static contact angle of the grated fabrics varied from 11.62 min to 7.45 min, from 9.78% to 10.40%, and from 122.30° to 92.84°, respectively, indicating that the hydrophilicity of the raw jute fabric improved. The modification conditions of the HRP-catalyzed AM-grafting reaction were optimized in terms of the nitrogen content of the jute fabrics.
研究领域:
材料科学
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生物化学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
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2025
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IF 4.7
Weihua Zhang,Changwen Zhao,Wantai Yang
High efficiently conducting Norrish II type UV-induced graft polymerization on fully aromatic liquid crystal polymers (LCPs) is still a great change due to its lack of sp3 hybridized C–H bonds. Here, a facile strategy for photograft modification of LCP film surfaces was developed. First, the LCP surface was modified by the UV-assisted aminolysis reaction to introduce H atoms that can be effectively abstracted by Norrish II type photosensitizers. Then, photograft polymerization of acrylic acid or styrene/maleic anhydride on the surface of modified LCP was achieved under UV irradiation by using benzophenone (BP) as a photosensitizer. The water contact angle of LCP decreased from 86° to 40° after being photografted with poly(acrylic acid) (PAA). The highest grafting density reached 7.78 × 10–2 mg/cm2, which is much higher than the unmodified LCP directly photografted with PAA (2.57 × 10–3 mg/cm2). The strategy showed excellent spatial controllability in preparation of the regionally modified LCP surface. Patterned polymer brushes of PAA and styrene-maleic anhydride copolymer could be introduced onto the surface of the LCP film with the help of a photomask, which were further used to selectively deposit a silver pattern by electroless plating and immobilize protein, respectively. The PAA-modified LCP deposited with the copper layer exhibited improved adhesive property with copper foil and had a peeling strength of 12.3 N/cm, which was much higher than the peeling strength of blank LCP (0.7 N/cm). This success of the two-step UV-induced graft surface modification of LCP has promising applications in the fields of high-speed electronic communication, biomedical materials, composite materials, and other fields.
研究领域:
材料科学
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高分子化学
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生物医学工程
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DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2024
·Vol. 64
·期 7
·3289-3302
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IF 3.2
Xian Wang,Zehan Zhang,Feng Gao,Xuelian He
Surface chemical grafting modifications of carbon fibers (CFs) using 5-(triethoxysilyl)norbornene (TOS), norbornene carboxylic acid tert-butyl ester (NB-TBE), and 5-norbornene-2,3-dicarboxylic anhydride (NA) improved interfacial interactions between CFs and poly(dicyclopentadiene) (PDCPD) resin. The ring-opening metathesis polymerization (ROMP) of DCPD, catalyzed by Grubbs catalyst II, enabled the fabrication of PDCPD/CF layered composite materials with resin and fibers tightly adhered. The optimal composite exhibited remarkable mechanical properties, with a tensile strength of 654.6 MPa and flexural strength of 510.7 MPa. Excellent thermal stability with a maximum weight loss rate in temperatures above 450°C and good chemical resistance with a weight change of about 1% in both acidic and alkaline media highlight the promising potential of these materials for use in harsh environments. The simple yet efficient approach of TOS, NB-TBE, and NA-enhanced layered CF shows great promise as advanced composite materials for industrial applications. Highlights Norbornene derivatives such as TOS, NB-TBE, and NA are suitable modifiers for CF. ROMP of DCPD and norbornene group onto CFs, fabrication of PDCPD/CF composite materials. The composite exhibited remarkable interfacial adhesion and mechanical properties.
研究领域:
材料科学
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复合材料
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化学工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 131
·期 23
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IF 1.64
Xia Li,Yiming Cao,Guodong Kang,Haijun Yu,Xingming Jie,Quan Yuan
A simple two-step surface modification method of polyamide nanofiltration membrane, involving the activation of amide groups by formaldehyde and the subsequent cerium [Ce (IV)]-induced graft polymerization of zwitterionic 3-(methacryloylamino) propyl-dimethyl-(3-sulfopropyl) ammonium hydroxide) (MPDSAH) monomers, was employed to improve membrane antifouling property. The membranes before and after modification were characterized by attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), scanning electron microscopy, and atomic force microscopy. The changes in both surface chemical composition and morphology of membranes confirmed the successful graft polymerizations of MPDSAH onto polyamide nanofiltration membrane. The static water contact angle measurements showed that surface hydrophilicity of the modified membranes was significantly enhanced. As the MPDSAH concentration increased, the water flux of grafted membrane decreased gradually, while salt rejection increased slightly. The fouling experiments with bovine serum albumin solution demonstrated that modified membranes exhibited better resistance to protein fouling. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 41144.
研究领域:
材料科学
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环境工程
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高分子化学
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产品关联
DOI
高影响因子
POLYMER
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2021
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IF 4.43
Jun Yin,Hui-fang Zhang
The block copolymer , Pluronic F127- block -poly(acrylic acid) (PAA-b-F127-b-PAA) was firstly synthesized via RAFT polymerization . Then, the copolymer was utilized as the blending modifier for fabricate polyethersulfone (PES)/PAA-b-F127-b-PAA composite membrane by nonsolvent induced phase separation technique. The hydrophilic PAA segments were concentrated onto the membrane surface due to the surface segregation phenomenon in the membrane formation process, which improved the hydrophilicity of the membrane surface and provided active sites for further surface grafting modification. Subsequently, the amine-terminated poly(sulfobetaine methacrylate) (NH 2 -PSBMA) was prepared through ARGET ATRP and used as surface modifier to fabricate PES/PAA-b-F127-b-PAA/PSBMA composite membrane by amination reaction. The composite membrane exhibited the highest pure water flux and oil flux around 358.25 and 217.53 L m −2 h −1 , which equal to 5.6 times and 19.6 times of unmodified PES membrane respectively. The flux recovery rate increased from 45.74% to 94.64%, suggesting the fouling-resistance of the composite membranes was greatly improved. The hydrophobic PPO segments of PAA-b-F127-b-PAA used as anchor segments and amalgamated with PES molecular by hydrophobic interaction and physical intertwisting, resulting in the PAA-b-F127-b-PAA was firmly embedded in the membrane. Moreover, the PSBMA segments were grafted onto the membrane surface by forming strong chemical bonds, exhibiting excellent stability. It shows that this membrane material prepared by physical blending and surface grafting has a good application prospect in oil/water separation.
研究领域:
材料科学
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环境工程
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化学工程
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DOI
高影响因子
PLASMA CHEMISTRY AND PLASMA PROCESSING
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2024
·Vol. 44
·期 5
·1951-1969
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IF 2.6
Siyuan Sui,Guohua Ni,Hongmei Sun,Ling Kong,Tao Sun
In this paper, a novel method is presented to enhance the antimicrobial properties of polyvinyl chloride (PVC) via plasma-induced grafting of quaternary ammonium (QA). The results show that the content of oxygen-containing functional groups on PVC surface is significantly increased after Ar-O 2 plasma treatment, beneficially enhancing the thickness and adhesion of QA coating. Plasma treatment time critically affects the morphology of PVC surface, which is closely related to the number, depth and diameter of pit on the surface. With the increase of pits size, the PVC surface forms ridge-like protrusions. The coating formed by grafting QA maintains the morphology characteristics of plasma-treated PVC surface. Results of antibacterial test show that specimens have the best antibacterial activity when there are a high and sharp ridge-like structure of QA coating on the plasma-treated PVC surface.
研究领域:
生物材料学
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表面科学
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高分子化学
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抗菌材料
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医学工程
✓ 已验证
DOI
高影响因子
FIBERS AND POLYMERS
·
2019
·Vol. 20
·期 11
·2289-2296
·
IF 1.439
Li Chunli,Ma Wei,Ren Xuehong
In this study, 2-(2-hydroxy-4-acryloyl)-2H-benzotriazole (BTHA), a benzotriazole ultraviolet absorber monomer, was synthesized from 2-(2,4-dihydroxyphenyl)-benzotriazole (BTDP) and acryloyl chloride. The synthesized BTHA was characterized by 1 H-NMR, FTIR, and ultraviolet spectroscopy, and grafted onto polyester fabrics by the traditional pad-dry-cure (PDC) process. The effects of monomer concentration and initiator concentration on the UPF values of the grafted PET fabrics were studied. The grafted fabrics were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA). The breaking strength of the grafted PET fabrics was comparable with the original PET fabrics in warp and weft directions. The UV protection factors improved significantly after grafting. The modified PET fabrics exhibited good durability to washing. The grafting of BTHA onto PET fabrics protected the damage of UV light to PET fabrics and decreased the strength loss of PET fabrics after UVA light exposure.
研究领域:
材料科学
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纺织工程
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高分子化学
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DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 12
·4201
·
IF 3.4
Deqi Wu,Mingxuan Luo,Rui Yang,Xin Hu,Chunhua Lu
Fluoropolymer/inorganic nanofiller composites are considered to be ideal polymer dielectrics for energy storage applications because of their high dielectric constant and high breakdown strength. However, these advantages are a trade-off with the unavoidable aggregation of the inorganic nanofillers, which result in a reduced discharge of the energy storage density. To address this problem, we developed polyvinylidene fluoride (PVDF) graft copolymer/cellulose-derivative composites to achieve high-dielectric and energy-storage density properties. An enhanced dielectric constant and improved energy density were achieved with this structure. The optimal composites exhibited a high discharge energy density of 8.40 J/cm3at 300 MV/m. This work provides new insight into the development of all-organic composites with bio-based nanofillers.Keywords:polyvinylidene fluoride;graft modification;cyanoethyl cellulose;composites;polymer dielectrics
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Meng-Long Liu,Yan-Hong Shen,Tao Zhou,Xu Han,Wen-Wen He
High-temperature proton exchange membrane fuel cells (HT-PEMFCs) exhibit higher catalytic efficiency and lower hydrogen purification costs. However, the conductivity and stability of high-temperature proton exchange membranes (HT-PEMs) still do not meet the requirements of commercial use. In this work, we synthesize 1,3,5-triphenylbenzene branched poly(terphenyl piperidine) and subsequently graft different ratios of long alkyl piperidine side chains, obtaining a series of novel HT-PEMs with excellent performance. The 1,3,5-triphenylbenzene improves the mechanical properties and chemical stability of membranes. The grafted side chains can increase PA uptake and optimize PA distribution, thereby improving the proton conduction capacity of the membrane. The test result shows that the b-PTP-75MPD membrane can achieve a high proton conductivity (137.7 mS cm −1 ) and high power density (742.9 mW cm −2 ). In conclusion, these strategies pave a new avenue for simple and low-cost method for developing high-performance HT-PEMs.
研究领域:
材料科学
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能源技术
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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）