JOURNAL OF POLYMER RESEARCH
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2024
·Vol. 31
·期 10
·1-10
·
IF 2.6
Yang Lei,Gao Lijing,Wei Ruiping,Xia Rongying,Wang Ziqi,Liu Huijun,Yao Mingzhu,Ma Guanghui,Xiao Guomin
Ethylene-vinyl acetate (EVA)grafted 2,4,6,8-tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane (V4) polymer EVA-g-V4 was prepared by free-radical solution grafting reaction. The results of the purified grafted products by FT-IR, 1 H NMR, XRD, TG and DSC show that V4 has been successfully grafted onto the main chain of EVA. The effects of the dosage of V4 and BPO on grafting ratio were studied. When the dosage of V4 was 6.0 wt%, and the dosage of BPO was 0.8 wt%, the grafting ratio was up to 1.4%. The cross-linking behaviour was verified by SEM. Compared with pure EVA film, the peel strength, mechanical properties, volume resistivity and hydrophobicity of EVA-g-V4 film all improved with increasing grafting ratio. This work provides a new option in the field of photovolatic encapsulation materials.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2010
·Vol. 35
·期 2
·360-368
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IF 3.006
Xu Fang,Shili Xiao,Mingwu Shen,Rui Guo,Shanyuan Wang,Xiangyang Shi
We report the fabrication of water-stable electrospun polyethyleneimine (PEI)/polyvinyl alcohol (PVA) nanofibers that have super dye sorption capability. Electrospinning parameters including flow rate, applied voltage, and polymer concentration were optimized to obtain smooth and uniform PEI/PVA nanofibers. The nanofibers with a mean diameter of 490 ± 83 nm can be rendered water insoluble via crosslinking using glutaraldehyde vapor. The formed nanofibers with a smooth and uniform morphology before and after crosslinking were characterized using scanning electron microscopy, Fourier transform infrared spectroscopy, and mechanical property testing. The sorption capability of the PEI/PVA nanofibers was confirmed by UV-vis spectrometry. We show that the water-stable nanofibrous mats can effectively absorb methyl blue, which is a typical dye used in the printing and dyeing industry. The dye sorption kinetics and isotherm follow the pseudo-second-order model and the Langmuir model, respectively. The developed polymer nanofiber system has a great potential in decolorizing dyeing wastewater for environmental remediation applications.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 55
·63800-63818
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IF 0
Fan Wenling,Wu Jiali,Sun Long,Gao Meiqi,Zhang Xiaotong
In the realm of oil–water separation technologies, membrane-based separation emerges as an efficacious approach. Nevertheless, crafting a hydrophilic membrane capable of effectively segregating herbal volatile oil remains a formidable challenge. Our study introduces a facile in situ assembly strategy for fabricating a double-crosslinked composite coating comprising phytate (PA)-polyethyleneimine (PEI) polyelectrolyte complexes and PA-Fe 3 ⁺ assemblies. The PA within the PA-PEI/Fe 3 ⁺ coatings form a double cross-linking layer through interactions with amine groups and metal ions, thereby enhancing interfacial interactions and structural integrity of the membranes. Consequently, the resultant PVDF/PA-PEI/Fe 3 ⁺ membranes exhibit improved coating stability, pronounced hydrophilicity, and exceptional antifouling capabilities, rendering them highly suitable for the separation of diverse herbal volatile oil-in-water emulsions. Furthermore, they possess the capability for reuse with an average retention ratio exceeding 90% and a pure water flux reaching up to 3200 L·m⁻ 2 ·h⁻ 1 . Additionally, they demonstrate long-term stability and resistance to corrosion. With a simplistic yet efficient preparation process, the PVDF/PA-PEI/Fe 3 ⁺ membrane holds significant potential for the extraction of oils from herbal volatile oil-in-water emulsions.
研究领域:
材料科学
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环境工程
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中药学
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产品关联
DOI
PubMed
ENVIRONMENTAL POLLUTION
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2020
·
IF 6.793
Bo-Yu Peng,Yiran Li,Rui Fan,Zhibin Chen,Jiabin Chen,Anja M. Brandon,Craig S. Criddle,Yalei Zhang,Wei-Min Wu
Larvae of Zophobas atratus (synonym as Z. morio , or Z. rugipes Kirsch, Coleoptera: Tenebrionidae) are capable of eating foams of expanded polystyrene (EPS) and low-density polyethylene (LDPE), similar to larvae of Tenebrio molitor . We evaluated biodegradation of EPS and LDPE in the larvae from Guangzhou, China (strain G) and Marion, Illinois, U.S. (strain M) at 25 °C. Within 33 days, strain G larvae ingested respective LDPE and PS foams as their sole diet with respective consumption rates of 58.7 ± 1.8 mg and 61.5 ± 1.6 mg 100 larvae −1 d −1 . Meanwhile, strain M required co-diet (bran or cabbage) with respective consumption rates of 57.1 ± 2.5 mg and 30.3 ± 7.7 mg 100 larvae −1 d −1 . Fourier transform infrared spectroscopy , proton nuclear magnetic resonance, and thermal gravimetric analyses indicated oxidation and biodegradation of LDPE and EPS in the two strains. Gel permeation chromatography analysis revealed that strain G performed broad depolymerization of EPS, i.e., both weight-average molecular weight (M w ) and number-average molecular weight (M n ) of residual polymers decreased, while strain M performed limited extent depolymerization, i.e., M w and M n increased. However, both strains performed limited extent depolymerization of LDPE. After feeding antibiotic gentamicin, gut microbes were suppressed, and M w and M n of residual LDPE and EPS in frass were basically unchanged, implying a dependence on gut microbes for depolymerization/biodegradation. Our discoveries indicate that gut microbe-dependent LDPE and EPS biodegradation is present within Z. atratus in Tenebrionidae, but that the limited extent depolymerization pattern resulted in undigested polymers with high molecular weights in egested frass.
研究领域:
环境科学
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微生物学
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昆虫学
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DOI
PubMed
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2016
·Vol. 218
·期 4
·1600449
·
IF 2.495
Yongjie Zhang,Qian Li,Wenbo Wang,Anru Guo,Jie Li,Huayi Li
Surface modification of carbon nanotubes (CNTs) with long polymer chains has attracted great attention since it promises high performance nanomaterials. However, due to the chemical inertness of both polyethylene (PE) and CNT, it still remains a challenge to covalently conjugate CNT with PE in a facile manner. In this report, trimethoxysilane terminated PE (TMS-PE) and trimethoxysilane modified multiwall carbon nanotube (TMS-MWNT) is prepared through radical mediated thiol-ene addition reaction between (3-mercaptopropyl)trimethoxysilane and vinyl terminated PE or pristine carbon nanotube, respectively. Subsequently, organotin-catalyzed hydrolytic co-condensation of TMS-PE and TMS-MWNT lead to PE covalently grafted mutliwall CNT (PE-Si-MWNT) with high graft ratio (17.5 wt%). Such reactions are robust and efficient and the reaction conditions are mild. In addition, the authors provide the very first evidence that end-grafted PE chains in PE-Si-MWNT, which are clearly observed in TEM images, can render high compatibility and good interfacial interactions between CNT and low density PE (LDPE) matrix and thus promote homogeneous dispersion of CNT into LDPE matrix as shown by scanning electron microscopy (SEM) characterization of brittle fracture surfaces of LDPE/PE-Si-MWNT nanocomposites.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2018
·Vol. 42
·期 16
·13382-13392
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IF 3.201
Ke Zheng,Shaoqi Zhou,Xuan Zhou
A series of low-cost poly(vinyl butyral) (PVB)/poly(vinyl chloride) (PVC) blended substrates were fabricated for the preparation of thin-film composite (TFC) forward osmosis (FO) membranes. The effect of PVB blend ratio on the substrate and TFC membrane was investigated. The results showed that the properties of the substrates were significantly improved and that the selective layer became looser, rougher, and less crosslinked after the introduction of PVB. The water permeability was initially improved when the PVB blend ratio increased from 0% to 30%. However, the NaCl rejection was rapidly declined with a further increase in the blend ratio, which should be ascribed to a decrease in the crosslinked degree of the PA selective layer. Meanwhile, the calculated results shows the value of structure parameter is sharply decreased to 186 μm for TFC30 from 2680 μm for TFC0. The results demonstrated that a PVB blend ratio of 30% should be the optimal ratio for fabrication of the substrate for the TFC membrane showing satisfactory FO performance: a high water flux of 29.37/49.85 L m−2 h−1 (FO/PRO mode) and a low specific salt flux of 0.11/0.10 g L−1 (FO/PRO mode) using 1 M NaCl as the draw solution and DI water as feed solution.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2015
·
IF 5.056
Junhui Wu,Zhi Wang,Yao Wang,Wentao Yan,Jixiao Wang,Shichang Wang
It is known that some commercially antifouling reverse osmosis (RO) membranes are coated with polyvinyl alcohol (PVA) layers. In this work, a new antifouling RO membrane was prepared by surface grafting of a commercial RO membrane (RE4021-TE from Woongjin, without a PVA layer) with the positively charged and hydrophilic polyvinylamine (PVAm) which was synthesized in lab. To determine the similarities and differences between the PVAm-grafted and PVA-coated membranes, one lab-prepared PVA-coated membrane (also coating on the TE membrane) and two typical commercially antifouling RO membranes with PVA coating layers (BW30FR from Filmtec and LFC3 from Hydranautics) were used for comparisons. Successful synthesis of PVAm was confirmed by the results of the ATR-FTIR and 1 H-NMR analyses. ATR-FTIR, XPS and zeta potential measurements of the membranes together indicated that the PVAm was successfully grafted onto the TE membrane surface. The membrane surface became more hydrophilic and smoother after the PVAm grafting. More importantly, for the TE membrane, the membrane surface charge climbed from negative to positive values after the grafting of PVAm with increasing concentrations, while the surface was still negatively charged after the PVA coating though the charge density was reduced. Besides, the PVAm grafting had smaller influence on the membrane permselectivity than the PVA coating: after the PVAm grafting (with a concentration of 0.20 w/v%) the salt rejection was slightly increased and the water flux decreased by 12.4%, but after the PVA coating the salt rejection was slightly declined and the water flux decreased by 35.4%. Fouling behaviors of the membrane grafted with 0.20 w/v% PVAm and the other three membranes with PVA coating layers were investigated and compared using two proteins (bovine serum albumin (BSA) and lysozyme), one polysaccharide (sodium alginate, SA), one surfactant (dodecyltrimethylammonium bromide, DTAB) and one colloid (colloidal ferric hydroxide, Fe(OH) 3 ) as model foulants. The results showed that the PVAm-grafted membrane exhibited better antifouling property than the two commercially antifouling RO membranes with PVA coating layers. In addition, fouling behavior of the lab-prepared PVA-coated membrane indicated that lower initial water flux resulted in less initial flux decline in the fouling process. This work provides a new potential strategy for improvement of antifouling property of commercial RO membranes besides the traditional PVA coating process .
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2017
·Vol. 35
·期 7
·866-873
·
IF 1.692
Liang Hua-qing,Zhou Qi-hua,Long Yong-jiang,Wei Wan-chu,Liang Guo-dong,Wu Qing,Gao Hai-yang,Zhu Fang-ming
Herein, we demonstrate the synthesis of a well-defined diblock copolymer consisting of isotactic polystyrene ( i PS) and linear polyethylene, isotactic polystyrene-block-polyethylene ( i PS- b -PE), by the combination of sequential monomer addition and hydrogenation. Isospecific living polymerization of styrene and living trans -1,4-polymerization of 1,3-butadiene were catalyzed by 1,4-dithiabutandiyl-2,2′-bis(6-cumenyl-4-methylphenoxy) titanium dichloride (complex 1) activated by triisobutyl aluminum modified methylaluminoxane (MMAO) at room temperature to provide highly isotactic polystyrene ( i PS) and 1,4- trans -polybutadiene (1,4- trans -PBD) with narrow molecular weight distribution. Furthermore, the iPS-b-1,4- trans -PBD was synthesized via sequential monomer addition in the presence of complex 1 and MMAO. The hydrogenation of the 1,4- trans -PBD block was promoted by RuCl 2 (PPh 3 ) 3 used as a catalyst to produce i PS- b -PE.
研究领域:
高分子化学
·
材料科学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Xinyi Chen,Gang Cao,Xinyun Wang,Hao Fang,Pengpeng Chen,Ying Xu,Wangyan Nie,Shaohua Zeng,Yifeng Zhou
The application of polyvinyl alcohol (PVA) films is still restricted due to their poor hydrophilicity, mechanical strength, and thermal stability. To improve these properties, a teardrop-shaped hollow polystyrene (HPS) nanoparticle was prepared in this work and further applied as the reinforcing nanomaterial. Herein, a teardrop-shaped silica nanoparticle was first used as the hard template; polystyrene was in situ-synthesized on the surface of teardrop-shaped silica, followed by the etching of the silica template. By tuning the synthesis parameters (e.g., styrene concentration and etching time), the optimal structure of HPS was obtained; subsequently, HPS was mixed with PVA by a solution-mixing method, which in turn produced the PVA-based synthetic foam film. Using optimal synthesis parameters of HPS and its loadings, the obtained syntactic foam films exhibited high transparency, excellent mechanical strength and toughness, and good thermal stability. Compared to pure PVA film, the tensile strength and toughness of PVA-based syntactic foam films containing 1.0 wt % HPS were improved by about 55 and 77%, respectively; the glass transition temperature and onset decomposition temperature of PVA-based syntactic foam films increased to about 32 and 66 °C, respectively. The research exemplifies the great promise of HPS toward practical application in polymer syntactic foams.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2023
·Vol. 61
·期 21
·2733-2741
·
IF 3.4
Houying Ma,Yuling Yang,Jianqiang Wang,Zhixiang Zeng,Lijing Zhu
Oil-fouling of the membranes limits further application in the separation and purification of oil-in-water emulsions. Here, anti-oil fouling membranes are engineered by the method of non-solvent induced phase separation (NIPS) which enriches the polysulfonated dopamine (PSDA) and polyethyleneimine (PEI) (PSDA-PEI) to the top surface from mixed casting solution. The obtained membrane achieves excellent anti-oil fouling property as high as 98.2% oil rejection, yet it still possesses good flux of 2362.5 ± 110.9 and 1252.3 ± 71.8 L m −2 h −1 for the separation of 1,2-dichloroethane-in-water and toluene-in-water emulsions. This can be attributed to outstanding hydrophilicity and super underwater superoleophobicity for mussel-inspired PSDA-PEI layer. In addition, the membrane also has excellent stability in acid (pH 1, 3, and 5) or alkali (pH 10 and 12) solutions. This work provides a facile method to engineer underwater superoleophobic membranes with excellent anti-oil fouling by mussel-inspired chemistry for oily water treatment. Graphical
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2023
·
IF 2.8
Hao Wang,Liwei Zheng,Bo Yuan,Shiwei Guo,Chungang Yuan
Polyethyleneimine (PEI) based positive charge nanofiltration (NF) membranes have unique advantages in the removal of heavy metals. The regulation mechanism of the interlayer when PEI was used as monomer was still not clear. In this study, a PVA-based interlayer was constructed on the origin PES sublayer to tailor the interfacial polymerization in PEI systems. It was proved that the PVA interlayer can further elevate the PWP and rejections of heavy metals. Moreover, the absorption effect of interlayers could contribute to better removal of heavy metals. More negative charges of interlayer could result in a more enough and uniform absorption of PEI monomer as well as a slower diffusion rate of PEI monomer during the interfacial polymerization reaction, thus forming a loose top surface but dense sub-separating layer. This study provides new insight into the effect of interlayer on the performance of PEI-based nanofiltration membrane.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Xinyue Wang,Xiangxia Zhang,Dong Xiang,Zhuxi Liu,Libing Liu,Chunxia Zhao,Hui Li,Menghan Wang,Bin Wang,Yuanpeng Wu
Developing flexible and wearable strain sensors that combine high performance and cost-effectiveness remains a challenge. In this work, a carbon nanotube/styrene–butadiene–styrene/ethylene vinyl acetate copolymer (CNT–SBS/EVA) flexible strain sensor with a double percolation structure was prepared by melt mixing and biaxial stretching at different stretching ratios (SRs). As the SR increased, the dispersion and orientation of the CNTs were further improved. Compared with the unstretched 2 wt.% CNT–SBS/EVA-1.0 sample (strain range 100%, gauge factor (GF) = 1237.95), the mechanical properties, sensitivity, and strain detection range were significantly improved after biaxial stretching. The elongation at break of the 2 wt.% CNT–SBS/EVA-1.5 (biaxially stretched at a SR of 1.5) sample increased by 310%. It exhibited higher sensitivity (GF = 176480.58), good linearity ( R 2 = 0.95) and a wider strain detection range (200%), as well as superior sensing performance and durability (2000 cycles), achieving improved performances. Finally, the practical value and potential applications of the CNT–SBS/EVA sensor in the monitoring of human physiological signals were demonstrated through response tests of different strain levels, such as joint and muscle movements.
研究领域:
材料科学
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纳米技术
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传感器
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高分子科学
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生物医学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）