COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2019
·
IF 6.282
Rui Cui,Jianping Ding,Yukun Chen
The effect of magnesium acrylate (MgMA) on the interfacial compatibility and shape memory behavior of ethylene propylene diene monomer (EPDM)/polypropylene (PP) thermoplastic vulcanizates (TPVs) prepared through peroxide-induced dynamic vulcanization was investigated in this paper. MgMA could react with both PP and EPDM at their phase interface , which improved the EPDM/PP interfacial compatibilization . The PP continuous phase fixed the temporary shape and the crosslinked EPDM particles provided driving force for shape recovery. The improved phase interface played a significant role in the stress transmission between PP and EPDM phases. It is found that the shape fixity ratio (R f ) and the shape recovery ratio (R r ) of TPVs exceeded ∼90% and ∼92.5%, respectively. With the increase of MgMA content, the R f of TPVs increased firstly and then decreased, while the R r and recovery rate enhanced in the whole process. Furthermore, the mechanical properties of TPVs were also improved with the increasing MgMA content.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Qinqin He,Wenhao Lu,Hang Zhou,Xiaonan Ji,Wei Hu,Kuo Pang,Zedong Teng,Xin Zhao,Lintao Wang,Keyu Fan,Feichao Hu,Min Li
Endogenous phosphorus (P) release is one of the key factors leading to eutrophication of water body. Phosphorus in sediments is difficult to be removed or recovered due to its chemical stability and complex morphology. Meanwhile, lanthanide metal organic framework (La-MOF) shows high efficiency in phosphate adsorption, but faces challenges in solid-liquid separation due to its powder form. In this study, the phosphorus solubilizing bacteria (PSB), Leclercia adecarboxylata L1–5, was used to transform some fractions of insoluble phosphorus in sediment into soluble phosphorus, and the La-MOF/Polypropylene (La-MOF/PP) fabric was innovatively prepared for phosphate adsorption. Solvothermal method was used for the preparation of La-MOF/PP fabric and the optimum synthesis time was 12 h. The best effect of phosphate removal was achieved when the La-MOF/PP fabric dosage was 1 g/L and the pH was 7. The regeneration efficiency of the material remained stable after five cycles of adsorption and desorption. Furthermore, the simulation results showed that PSB can release dissolved phosphate up to 5.40 mg P/L from sediment. After coupling with the La-MOF/PP fabric, the concentration of phosphate in the overlying water was significantly reduced to 0.38 mg P/L, which was much lower than that in the CK group (2.4 mg P/L). This study demonstrated that the coupled system of PSB and La-MOF/PP fabric could effectively reduce the sediment phosphate content, mitigate the negative impact of possible release of sediment phosphorus and degradation of the overlying water quality. It provided a promising technique for in-situ remediation of sediment phosphate.
研究领域:
环境科学
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材料科学
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生物技术
·
水污染控制
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Haihong Yin,Zhirun Qian,Yunfeng Wu,Zhipeng Chen,Fuzhi Wang,Tingting Chen,Bocheng Su,Kangwei Wen,Haijian Chen,Zhenguo Wang,Lin Qin
Lithium-sulfur batteries (LSBs) provide high capacity and energy density for advanced energy storage but encounter performance and safety issues due to lithium polysulfides (LiPSs) dissolution and dendrite formation. This study introduces a dual-functional SnO 2 -CNT-PANI||PP=|SnO 2 separator (DF-SNCPS) aimed at improving the stability and safety of LSBs. The separator includes a SnO 2 -CNT-PANI layer on the sulfur cathode side for enhanced electrical conductivity and polysulfide adsorption and a SnO 2 nanoparticle (nano-SnO 2 ) layer on the lithium anode side to regulate lithium-ion concentration and inhibit dendrite growth. Density functional theory (DFT) and the phase field method have verified the relevant material's catalytic performance and dendrite suppression ability. These methods have provided a comprehensive understanding of the underlying mechanisms, providing auxiliary explanations for their role in catalyzing polysulfide conversion and suppressing lithium dendrite growth. This innovative design mitigates the shuttle effect and enhances cyclic stability and sulfur utilization, achieving a notable cyclic performance with a capacity retention of 0.05 % per cycle over 800 cycles at 1 C. The synergistic effects of the modified separator present a viable pathway for LSB commercialization.
研究领域:
材料科学
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能源存储
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电池技术
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纳米技术
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Mengmeng Xu,Chengzhong Zong
It is challengeable to obtain shape memory effect in the traditional thermoplastic vulcanizate (TPV) with sea-island microstructure. Herein, we successfully achieved shape memory behavior in the type of ethylene propylene diene monomer/polypropylene thermoplastic vulcanizate (EPDM/PP TPV) compatibilized by the graft products of magnesium maleic (MgMA) and maleic anhydride (MAH) on the interface of EPDM/PP. MgMA and MAH derived from the in situ neutralization reaction of maleic acid (MA) with magnesium oxide (MgO) and the dehydration reaction of MA respectively. In this paper, the mole ratio of MA and MgO on the performance of EPDM/PP TPV was studied. With the incorporation of MA and MgO, the mechanical property and shape memory performance were improved. The result of DMA, FTIR, and SEM verified the successful graft reaction of MgMA and MAH on the polymer chains. The compatibilized EPDM/PP TPV achieved the improved mechanical property of tensile strength (12.9 MPa) and elongation at break (583.5%), the increased R f of 96.2% and R r of 86.7% at the tailoring mole ratio of MA:MgO (1:1.5).
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2023
·
IF 4.6
Mengmeng Xu,Yingxia Zong,Chengzhong Zong
The effects of magnesium maleate (MgMA) and maleic anhydride (MAH) on the interfacial interaction and the shape memory properties of ethylene propylene diene monomer (EPDM) and polypropylene (PP) thermoplastic vulcanizate (TPV) with sea island structure prepared by dynamic vulcanization were investigated in this study. PP matrix could maintain the temporary shape of TPVs and the crosslinked EPDM phase supplied stress to drive the deformed shape recovery during the shape memory process. MgMA and MAH grafted on PP and EPDM chains verified by FTIR, DMA and SEM, which improved the interfacial compatibility of EPDM and PP and enhanced the efficiency of stress transfer in the shape memory process. The shape fixity ratio (R f ) and shape recovery ratio (R r ) of TPVs compatibilized by MgMA and MAH were almost above 80%. The shape memory property and the mechanical performance of TPVs were all improved compared to that of the sample without compatibilization .
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 134
·期 5
·
IF 1.866
Jinbo Jin,Kaizhou Zhang,Xilan Du,Jingkui Yang
Membrane fouling remains a major barrier to membrane separation, particularly obvious in polymer membranes. Dopamine (DA) is of great value as a precursor for conjugation hydrophilic molecules. In this study, PP hollow fibrous membranes were first modified by DA to form a layer of polydopamine (PDA) coating. Then taurine and glycidol were introduced respectively with assisted by PDA reactive layer, the prepared membranes corresponding to PP-T and PP-G membranes, respectively. PP and the modified PP membranes were confirmed by a thorough membrane characterization of ATR-FTIR, XPS, and FESEM measurements. The hydrophilic properties and permeability were measured by water contact angle (WCA) and permeation flux test. BSA was used to as model protein to evaluate the antifouling properties of the membranes. The results showed that taurine and glycidol were successfully introduced onto the membrane surface. The WCA of PP-T and PP-G membranes can be reduced to 32° and 26°, and the flux recovery ratio increased around 90.6% and 89.8%, respectively. Based on the experimental results, taurine and glycidol effectively improved the hydrophilic and anti-fouling performance of PP membrane. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44430.
研究领域:
材料科学
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化学工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
·
2023
·
IF 3.3
Haijun Chang,Yuanwei Shi,Jie Xiong,Zhaoying Bo,Yan Dai
Summary This study investigated the effects of the combination of Gaphalium affine extract (GAE) and sodium pyrophosphate (PP) on the structure and oxidative stability of porcine myofibrillar proteins (MPs) under oxidative stress. The results showed that GAE was rich in total flavonoids and total phenols (37.09% and 67.50%, respectively). GAE had strong free radical scavenging ability, especially for • OH, and the semi-inhibitory concentration (IC 50 ) of • OH reached as high as 3.59 μg/mL, which was slightly lower than that of the standard antioxidant vitamin C (V c ). The addition of GAE and PP significantly inhibited the formation of carbonyl groups compared to the control group ( P < 0.05). The presence of GAE further promoted the loss of total sulphydryl groups by 3.52% compared to the oxidative control group ( P < 0.05). However, PP and PP+G significantly inhibited the loss of total sulphydryl groups ( P < 0.05). The further reduction in the carbonyl content, increase in the hydrogen bond content, inhibition of the conversion of sulphydryl groups to disulphide bonds, and decrease in the cross-linking aggregation of corresponding proteins all indicate that GAE and PP could cooperatively regulate the oxidation of MPs. An appropriate amount of PP effectively modified the damage caused by GAE on both the secondary and tertiary structure of MPs to maintain their structural stability, however, a relatively higher concentration of PP led to a substantial degree of MP collapse and affected the quality of the proteins. These results suggest that the oxidative stability of MPs can be improved by the addition of an appropriate amount of GAE (0.2 mg/g protein) combined with PP (1 mM).
研究领域:
食品科学
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生物化学
·
蛋白质化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2017
·
IF 3.386
Xinming Ye,Yuanhang Wang,Zhilei Zhao,Hong Yan
A novel P-N containing hyperbranched poly(phosphorodiamidate) (HBPPDA) was synthesized by the A 2 +B 3 polymerization, which had high thermal stability, with greater than 40 wt% of the char residue left at 750 °C. The benzene and triazine rings in HBPPDA contributed to a good char-forming capacity. Furthermore, a large number of terminal primary amines could release incombustible gases to dilute the concentration of oxygen. Thus, HBPPDA could act as blowing agent and carbonization agent simultaneously. Only 6.25 wt% of HBPPDA could greatly enhance the flame-retarding efficiency of ammonium polyphosphate (APP), showing a remarkable synergy to improve flame retardancy and dripping resistance of polypropylene (PP). When 25 wt% of flame retardant (APP:HBPPDA = 3:1) were added into PP matrix, the composite achieved V0 rating for UL-94 test, and its limiting oxygen index (LOI) value was increased to 30.6%. The reduction of 76.2% and 41.5% were available for the peak heat release rate (PHRR) and the total heat release (THR). Meanwhile, the composite showed strong smoke suppression.
研究领域:
聚合物科学
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材料科学
·
消防安全工程
✓ 已验证
产品关联
DOI
高影响因子
PLANT PHYSIOLOGY
·
2017
·Vol. 176
·期 2
·1808-1823
·
IF 6.456
Hu Qin,Min Ling,Yang Xiyan,Jin Shuangxia,Zhang Lin,Li Yaoyao,Ma Yizan,Qi Xuewei,Li Dongqin,Liu Hongbo,Lindsey Keith,Zhu Longfu,Zhang Xianlong
Plants are constantly challenged by a multitude of pathogens and pests, which causes massive yield and quality losses annually. A promising approach to reduce such losses is to enhance the immune system of plants through genetic engineering. Previous work has shown that laccases (p-diphenol:dioxygen oxidoreductase, EC 1.10.3.2) function as lignin polymerization enzymes. Here we demonstrate that transgenic manipulation of the expression of the laccase gene GhLac1 in cotton (Gossypium hirsutum) can confer an enhanced defense response to both pathogens and pests. Overexpression of GhLac1 leads to increased lignification, associated with increased tolerance to the fungal pathogen Verticillium dahliae and to the insect pests cotton bollworm (Helicoverpa armigera) and cotton aphid (Aphis gosypii). Suppression of GhLac1 expression leads to a redirection of metabolic flux in the phenylpropanoid pathway, causing the accumulation of JA and secondary metabolites that confer resistance to V. dahliae and cotton bollworm; it also leads to increased susceptibility to cotton aphid. Plant laccases therefore provide a new molecular tool to engineer pest and pathogen resistance in crops.
研究领域:
植物学
·
遗传学
·
分子生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Yiwen Wang,Yang Liu,Qiu Han,Haibo Lin,Fu Liu
Extracorporeal membrane oxygenation is a technique that provides short-term supports to the heart and lungs. It removes CO 2 from the blood and provides enough oxygen, which is a huge help in the fight against COVID-19. As the key component, the artificial lung membranes have evolved in three generations including silicon, polypropylene and poly (4-methyl-1-pentene). Herein, we for the first time design and fabricate a novel poly (4-methyl-1-pentene)/polypropylene (PMP/PP) thin film composite (TFC) membrane with the anticoagulant coating composed of poly (sodium 4-styrenesulfonate) and cross-linked poly (vinyl alcohol). Poly (sodium 4-styrenesulfonate) provides sulfonic acid groups to inhibit the coagulant factors (FVIII and FXII), and cross-linked poly (vinyl alcohol) increase the stability of the anticoagulant coating and further improve the hydrophilicity via abundant hydroxyl groups to depress the protein adsorption. Long-term anticoagulant property was demonstrated by whole human blood for 28 days. Blood compatibility was evaluated by hemolysis rate, anticoagulation activity (APTT, TT and PT), complement activation, platelet activation and contact activation. Pure CO 2 , O 2 and N 2 permeation rates were determined to evaluate the mass transfer properties of PMP/PP TFC membranes. Gas permeation results revealed that gas permeation flux increased in the TFC membranes because of the decrease of crystallinity. Overall, the so prepared PMP/PP membrane shows good CO 2 /O 2 selectivity and blood compatibility as novel TFC artificial lung membrane.
研究领域:
生物医学工程
·
材料科学
·
医疗器械
·
血液相容性
·
气体分离膜
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2025
·
IF 4.5
Mengmeng Xu,Chengzhong Zong
The type of EPDM/PP TPV was the most widely used TPV with excellent mechanical property. To achieve functional property of EPDM/PP TPV, the EPDM/PP TPV compatibilized by magnesium maleate (MgMA) and maleic anhydride (MAH) was compounded with carbon nanotube (CNT) during dynamic vulcanization. The hydroxyl on CNT could reacted with the anhydride group on the graft products of polymer chains that promoted the uniform dispersion of CNT in TPV. The EPDM/PP TPV with excellent shape memory performance and electrical conductivity was successfully prepared. The successful reaction of CNT with anhydride on polymer chains in the compatibilized TPV M5C2 was verified by the result of FTIR, Raman spectrum and SEM image, which improved the mechanical performance, shape memory property and electrical conductivity of TPV M5C2 compared to TPV M0C2 with the same CNT content. TPV M5C1 obtained excellent shape memory performance with the R f of 96.0 % and R r of 93.9 %. The electrical conductivity of TPV M5C8 was as high as 1.6 × 10 −4 S·cm −1 demonstrating the formation of CNT conductive network in TPV.
研究领域:
材料科学
·
高分子科学
·
纳米技术
·
化学工程
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
·
2024
·Vol. 31
·期 4
·1738-1747
·
IF 2.9
Phichet Ketsamee,Alun Vaughan,Thomas Andritsch
This study investigates the influence of polar silane coupling agents (SCAs) on charge transport in polypropylene (PP) nanocomposites containing magnesium oxide (MgO) and titanium dioxide (TiO2) nanoparticles in the presence of water molecules. Surface functionalization results in reduced charge accumulation and electrical conductivity compared with unmodified nanocomposites. Under vacuum-dried conditions, the charge transport is primarily dominated by the types of nanoparticles. It is hypothesized that band bending at the interfaces of MgO used in the PP matrix is more effective in suppressing charges than TiO2. Regarding humidity, the extent of water absorption not only influences charge transport but also contributes to the bonding states between water molecules and nanoparticle surfaces. Despite higher water absorption, band bending at the interfaces in PP/MgO potentially limits the increase in charge transport. In addition, differences in electronegativity during surface functionalization would lead to distinct bonding states with water molecules, resulting in varying energy band levels at interfaces, which in turn influence the ability of materials to capture charge carriers. The most effective charge suppression and reduced electrical conductivity are achieved in ethoxy-modified materials with amino functional groups.
研究领域:
材料科学
·
物理化学
✓ 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）