Polymers
·
2019
·Vol. 11
·期 9
·1467
·
IF 3.164
Lijun Gao,Meiying Huang,Qifeng Wu,Xiaodan Wan,Xiaodi Chen,Xinxin Wei,Wenjing Yang,Rule Deng,Lingyun Wang,Jiuying Feng
Cross-linking is an effective way to enhance biodegradable poly(propylene carbonate) (PPC) from CO2and propylene oxide (PO). Cross-linked PPC can be prepared by one-step terpolymerization of multifunctional third monomers with CO2and PO. However, few such third monomers are available. Each molecule of maleic anhydride oligomer (MAO) contains more than two cyclic anhydride groups. Here, we use it to synthesize PPC with cross-linked networks by adding a small quantity of MAO (0.625–5 wt% of PO) in CO2/PO copolymerization that was catalyzed by zinc glutarate. The formation of networks in the prepared copolymers was confirmed by the presence of gel in copolymers combined Fourier transform infrared spectroscopy (FT-IR),1H NMR, and the improved mechanical properties. The 5% weight-loss degradation temperatures and maximum weight-loss degradation temperatures greatly increase up to 289.8 °C and 308.8 °C, respectively, which are remarkably high when compared to those of PPC. The minimum permanent deformation of the copolymers closes to 0, while that of PPC is 173%. The maximum tensile strength of the copolymers is 25.5 MPa higher than that of PPC, reaching 38.4 MPa, and it still has some toughness with the elongation at break of 25%. The above phenomena indicate that MAO that was inserted in PPC chains play a cross-linking role, which results in enhanced thermal stability, dimensional stability, and mechanical strength, comprehensively.Keywords:poly(propylene carbonate);networks;maleic anhydride oligomer;terpolymerization
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INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
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2026
·
IF 4
Wenjie Luo,Kai Cai,Haobo Wang,Lingzhi Jiang,Shuhua Tu,Jie Feng
Mechanochemical grafting of MAH and ZDA enables the functionalization of BR. • Co-grafting of MAH and ZDA enhances the grafting degree of MAH. • The peptizing agent promotes chain scission and enhances the grafting degree of MAH. • The application of graft-modified BR enables robust rubber-to-metal bonding. The adhesion between metal and rubber plays a crucial role in modern industrial applications, particularly in the fabrication of high-performance composite structures. This study investigates rubber-to-metal bonding via a mechanochemical grafting strategy, where butadiene rubber (BR) was functionalized with maleic anhydride (MAH) and zinc diacrylate (ZDA). The intense shear forces generated within an internal mixer induce the formation of free radicals on BR, thereby facilitating the co-graft of MAH and ZDA. The addition of 2,2′-dibenzamidodiphenyl disulfide (DBD) promoted chain scission and enhanced the grafting degree. The graft-functionalized BR was incorporated into the rubber compound and co-vulcanized with γ-aminopropyltriethoxysilane (KH550)-modified steel substrates, thereby achieving strong rubber-to-metal bonding. It was confirmed that MAH and ZDA were successfully grafted onto the molecular chains of BR. At a loading of 1.0 phr for both MAH and ZDA, the BR-1.0 MZ-0.5 D sample exhibited a grafting degree of 0.74% and a grafting efficiency of 68.24%, representing 284.6% and 264.3% of the DBD-free control. When the loadings of MAH and ZDA were 1.5 phr with the addition of DBD, the 90° peel strength reached a maximum value of 10.2 kN/m, exhibiting cohesive failure. Therefore, mechanochemical grafting effectively enhances rubber-to-metal adhesion, and DBD markedly improves grafting degree.
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JOURNAL OF POLYMER RESEARCH
·
2026
·Vol. 33
·期 1
·18
·
IF 2.8
Hu Minglei,Zhang Wei,Hu Bin,Chu Fuqiang,Yang Haicun,Cao Zheng
To enhance both the adhesive strength and cohesion of the adhesive resin, attapulgite (ATP) was chemically modified by peroxy groups to parepared ATP with initiation function (ATP-CPO). Subsequently, a series of high density polyethylene/ATP composites (HDPE/ATP) functionalized with maleic anhydride and vinyl trimethoxysilane were prepared via surface-initiated graft copolymerization. The effects of ATP-CPO dosage on the mechanical, thermal, rheological, and morphological characteristics of the composites were evaluated in detail. It was found that the surface functionalization and reactive extrusion process contributed to the nano-scale dispersion of ATP in the HDPE matrix, forming well-compatibilized nanocomposites consisting of HDPE-g-(MAH-co-VTMS), ATP-g-(MAH-co-VTMS), and more complex MAH/VTMS synergistically functionalized ATP-g-HDPE. When the ATP-CPO content was 4%, the composite exhibited significantly enhanced tensile strength, 180° peel strength, and shear strength, which were 1.4, 26.3, and 21.7 times higher than those of pure HDPE, respectively. Concurrently, the composites displayed higher melting and crystallization temperatures. However, the crystallinity decreased slightly, while the thermal stability was significantly improved. The melt exhibited more pronounced non-Newtonian behavior. Compared to the loss modulus, the storage modulus increased more significantly in the low-frequency region, and a non-terminal effect was observed, which enhanced the structural stability of the system under low-frequency shear stress.
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MATERIALS AND STRUCTURES
·
2023
·Vol. 57
·期 1
·1-17
·
IF 3.8
Chen Xingren,Liu Zuguang,Fu Xiyao,Xie Xiongmin,Wang Ting,Rong Zhijuan,Nong Youchao,Lu Zhenren
A series of polycarboxylate superplasticizers (PCEs) with varying carboxyl densities were synthesized at room temperature using the molecular design principle. The PCEs molecular structure was determined using 1 H NMR and MALDI-TOF. The paste fluidity, foam stability as well as other performance of PCEs obtained was also tested. The investigations reveal that the PCEs with high carboxyl density cause the extended main chain conformation due to the strong electrostatic repulsion, resulting in the increase of hydrodynamic radius (Rh), which is beneficial to increase the ‘accessible carboxyl’ in the main chain, and improves its adsorption capacity; In addition, the PCEs with high carboxyl density also have high hydrophilicity, which will form micro bubbles to better disperse cement particles, and improve the fluidity of cement pastes. This study is aimed to provide a comprehensive understand for the mechanism of maleic anhydride-modified TPEG-type PCEs from the viewpoint of molecular architecture and conformation, and improve the workable performance of concrete mixture with the PCEs.
研究领域:
材料科学
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高分子化学
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土木工程
·
表面化学
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International Journal of Nanomedicine
·
2022
·
IF 7.033
Xiaopin Duan,Jisheng Xiao,Qi Yin,Zhiwen Zhang,Shirui Mao,Yaping Li
Background and methods A new amphiphilic comb-shaped copolymer (SP) was synthesized by conjugating poly(styrene-co-maleic anhydride) with low molecular weight polyethyleneimine for gene delivery. Fourier transform infrared spectrum, 1H nuclear magnetic resonance, and gel permeation chromatography were used to characterize the graft copolymer.Results The buffering capability of SP was similar to that of polyethyleneimine within the endosomal pH range. The copolymer could condense DNA effectively to form complexes with a positive charge (13–30 mV) and a small particle size (130–200 nm) at N/P ratios between 5 and 20, and protect DNA from degradation by DNase I. In addition, SP showed much lower cytotoxicity than polyethyleneimine 25,000. Importantly, the gene transfection activity and cellular uptake of SP-DNA complexes were all markedly higher than that of complexes of polyethyleneimine 25,000 and DNA in MCF-7 and MCF-7/ADR cell lines.Conclusion This work highlights the promise of SP as a safe and efficient synthetic vector for DNA delivery.
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CONSTRUCTION AND BUILDING MATERIALS
·
2023
·
IF 7.4
Bingzheng Jiang,Dong Chen,Li Wang,Wantai Yang
In this research, a novel method was developed to synthesize methoxy polyethylene glycol-grafted sulfonated poly(maleic anhydride- alt -styrene) (SPMS-g-mPEG) as cement superplasticizers. The method includes three main steps: 1) self-stabilized precipitation polymerization (2SP) of styrene and maleic anhydride for PMS microspheres; 2) gas-solid heterogeneous sulfonation reaction (GSR) of gaseous SO 3 with PMS microspheres; 3) intramolecular sulfonic acid-catalyzed esterification reaction of mPEG with sulfonated PMS (SPMS). GSR can achieve uniform sulfonation of PMS microspheres, while overcoming the inherent drawbacks of the traditional homogeneous solution sulfonation process. SPMS and SPMS-g-mPEG with different structural parameters and uniform structure were successfully prepared and their effects on the fluidity and fluidity retention of cement pastes were systematically compared. For the samples demonstrating the best dispersing ability, the hydration heat and setting time of cement pastes, adsorption kinetics and compressive strength of mortar samples were determined further. Our work provides an innovative and effective approach to superplasticizers with outstanding properties and its uniform structure facilitates the investigation on the relationship between structure and properties.
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Nanoscale
·
2023
·Vol. 15
·期 8
·4053-4062
·
IF 6.7
Can Xu,Hongyi Shu,Chuxuan Chen,Xi Qi,Pengfei Zhou,Yuhong Ma,Changwen Zhao,Wantai Yang
Owing to the frequent occurrence of diclofenac sodium (DS) in fresh aquatic environments and its potential toxicity towards living organisms, the effective removal of DS has attracted worldwide attention. Herein, a green and efficient strategy to fabricate crosslinked microspheres with interconnected mesoporous structures and abundant adsorption active sites was developed. With this strategy, triallyl isocyanurate (TAIC)–maleic anhydride (MAH) copolymer microspheres (TMs) with a diameter of 1.19–1.35 μm were first prepared by self-stabilized precipitation (2SP) polymerization, and the TMs possess a large amount reactive anhydride groups (62.5–71.8 mol%), a specific surface area of 51.6–182.4 m2 g−1 and a mesoporous structure (average pore size: 3.4–3.8 nm). Then the TMs were further functionalized with polyethylenimine (PEI) to give rise to cationic microspheres (Cat-TMs), which showed excellent adsorption performance to DS with a rapid adsorption rate (reached equilibrium within 30 min), a very high equilibrium adsorption capacity (1421 mg g−1) and excellent recyclability. The pseudo-second-order model and Langmuir model were a good fit for the adsorption kinetic and isotherm process, respectively. Furthermore, due to the high cation density (4.291 mmol g−1) and excellent pH buffer capacity of Cat-TMs, the adsorption capacity can be maintained at a high level within the pH range of 6–10. The regenerated Cat-TMs showed only a slight loss (<5%) in the adsorption capacity even after 5 adsorption–desorption cycles. In short, Cat-TMs can be considered as a highly promising adsorbent for the rapid and ultra-efficient removal of anionic organic contaminants and have significant potential to be applied in wastewater treatment.
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Regenerative Biomaterials
·
2022
·
IF 5.763
Chen Lin-Fei,Chen Ying,Duan You-Yu,Zhang Man-Man,Xu Pei-Yao,Kankala Ranjith Kumar,Wang Shi-Bin,Chen Ai-Zheng
Aripiprazole (ARI), a second-generation atypical antipsychotic drug approved for schizophrenia treatment, shows good efficacy against depression. However, the poorly aqueous solubility of ARI leads to low bioavailability and increased dose-related side effects, seriously limiting its application in pharmaceutics. Herein, we demonstrated the fabrication of ARI and poly (methyl vinyl ether-co-maleic anhydride) (PVMMA) composite nanoparticles (PA NPs) using the supercritical antisolvent (SAS) process for enhancing its water-solubility and curative anti-depressant effects. Initially, the optimal experimental conditions (ARI/PVMMA mass ratio of 1:6, pressure of 10 MPa, and solution flow rate of 0.75 ml min−1) were determined by a 23 factorial experimental design, resulting in the PA NPs with an excellent particle morphology. In vitro cell experiments showed that PA NPs significantly inhibited the inflammatory response caused by the microglia activation induced by lipopolysaccharide (LPS). Similarly, mice behavioral tests demonstrated that PA NPs significantly improved LPS-induced depression-like behavior. Importantly, compared with free ARI, the LPS-induced activation of microglia in the mouse brain and the expression of inflammatory factors in serum were significantly reduced after treatment with PA NPs. Together, the innovative PA NPs designed by SAS process might provide a candidate for developing new ARI-based nano-formulations.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Yanna Wu,Jianxian Zeng,Xiaoping Huang,Zhengqiu Yuan,Guoqing Liu,Jie Ding
Nanofiltration membrane with good separation performance can effectively remove dyes from wastewater. A new type of composite membrane (TiO 2 /PEI/PDA-SMA/PES), which possesses excellent dye/salt separation property, was facilely manufactured by a combined strategy of mixing styrene-maleic anhydride (SMA) with polyethersulfone (PES), polydopamine (PDA) coating, titanium dioxide (TiO 2 )/polyethylenimine (PEI) co-deposition and cross-linking. The as-prepared membranes were characterized using SEM, AFM , FTIR , surface zeta potential , water permeability and contact angle measurement. The effect of TiO 2 content on permeability and retention of membrane was discussed. Results demonstrate that TiO 2 /PEI/PDA-SMA/PES membrane is hydrophilic and positively charged, and it exhibits high permeability for pure water (73.2 L·m −2 ·h −1 ·bar −1 ), reasonable retention to dyes (98.6%, 92.3% and 90.4% for Congo Red, Rhodamine B and Crystal violet, respectively) and satisfactory transport to salts (39.5, 36.4, 30.6 and 29.4 L·m −2 ·h −1 ·bar −1 for Na 2 SO 4 , NaCl, MgSO 4 and MgCl 2 , respectively). In addition, the membrane shows a great antifouling performance and long-term stability during the filtration of dye/salt simulated wastewaters. Further, the membrane is used to treat actual textile wastewater. It also shows good separation performance (permeability 10.6 L·m −2 ·h −1 ·bar −1 , COD retention 98.2%, and color retention 99.7%). Perhaps it is fit for potential treatment of textile wastewater.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Cheng Zhang,Dong Chen,Wantai Yang
In this paper, we report for the first time the self-stabilized precipitation polymerization of styrene (St), maleic anhydride (MAH), and acrylamide (AM) in isoamyl acetate as the reaction medium. The effects of various reaction parameters, including the reaction medium, monomer concentration, reaction time, and monomer feed ratio, on the morphology and chemical composition of the resultant poly(St/MAH/AM) terpolymer particles were investigated systematically. The experimental results demonstrated that uniform poly(St/MAH/AM) terpolymer particles with the diameter in the range of 50 to 2000 nm were facilely obtained over a wide range of monomer feed ratios of St/MAH/AM (from 40:40:20 to 10:10:80). Furthermore, the chemical composition of the terpolymer particles was largely dependent on the initial monomer feed ratio, which remained almost constant irrelevant of reaction time when the molar ratio of [St]/[MAH] was 1:1. Therefore, the poly(St/MAH/AM) terpolymer particles with a well-defined morphology, uniform size, and controlled chemical composition can be efficiently synthesized via this method, and the anhydride and amide functional groups provide poly(St/MAH/AM) particles with intensive potential for various applications.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2019
·Vol. 37
·期 5
·509-517
·
IF 2.804
Chen Yu,Yao Jian,Xu Ming-Ke,Jiang Zhi-Guo,Zhang Hao-Bin
Electrically conductive and flame-retardant maleic anhydride grafted high-density polyethylene (MA-HDPE) nanocomposites with satisfactory mechanical properties are fabricated by melt compounding MA-HDPE with polyethyleneimine (PEI)-modified reduced graphene oxide (PEI@RGO) as the conductive nanofiller and brominated polystyrene (BPS) as the flame retardant. The modification with PEI significantly improves the interfacial compatibility and dispersion of the RGO sheets in the MA-HDPE matrix, leading to electrically conductive nanocomposites with enhanced mechanical properties. Furthermore, the addition of 25 wt% of BPS makes the nanocomposite flame-retardant with a UL-94 V-0 rating. Thus, the multifunctional RGO/MA-HDPE nanocomposites with good electrical, flameretardant, and mechanical properties would have potential applications in construction and pipeline fields.
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Catalysis Science & Technology
·
2024
·
IF 4.4
Muhammad Faizan,Erum Aamir,Tiong Sieh Kiong,Hua Song
Vanadium phosphorus oxide (VPO) catalysts are synthesized for utilization of lighter alkanes such as n-butane to produce maleic anhydride (MA) by a selective oxidation process. Such a process has received huge global attention because of greater selectivity, eco-friendliness and being a less-expensive process as compared to the benzene oxidation process for the production of MA. Herein, we introduced for the first time 2-D MXene Ti3C2 (Mx) into VPO synthesis and prepared Ti3C2@VPO (MXene@VPO; Mx@VPO) nanocomposites via solvothermal and ball milling processes as a promoter and supporter at different (1–5) wt% for the evolution of n-butane selective oxidation. Among them, the solvothermal based promoted catalyst (5% Mx@VPO) exhibited large MA selectivity (up to 11%) as compared to the unpromoted catalyst. Simultaneously, it will decrease the COx selectivity (CO2 and CO). More importantly, the CO : CO2 ratio is reduced up to 1.5 from 2.01, which is beneficial for the environment and chemical plants. From various characterization techniques such as BET, XPS, SEM, TEM, XRD, FT-IR, NH3-TPD, H2-TPR, EDS, EPR, Raman, and TG/DTA we confirmed the role of MXene as a structure directing agent and electron promoting agent in VPO catalysis.
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