JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 20
·48691
·
IF 2.188
Shuning Chen,Jie Ai,Jiawen Chen,Jianrong Lin,Qinhui Chen
People are always puzzled by “white pollution” in recent decade. Recycling of waste styrofoam as a coating is a good sustainable solution to resolve this problem. However, the poor compatibility between inorganic additives and polymer hinders the application of recycled polystyrene. In this article, anisotropic Janus particles were used to increase the compatibility of titanium dioxide/waste styrofoam coatings. SEM results show that Janus particles can be anchored at the interface between styrofoam and titanium dioxide, increasing the dispersion of titanium dioxide, and improving the compatibility of inorganic particles and organic polymer. The glass-transition temperature of styrofoam coating increases from 77 °C to 89 °C in titanium dioxide/styrofoam contained 1 wt % of Janus particles, which certified that Janus particles have compatibilization on titanium dioxide/styrofoam coating. Attributing to this compatibilization, the tensile strength of titanium dioxide/styrofoam with 1 wt % of Janus particles rises about 45% compared with titanium dioxide/styrofoam. The yield stress, storage modulus, and viscosity of titanium dioxide/styrofoam contained 1 wt % of Janus particles are the smallest and the closest to Newtonian fluid. Janus particles used in the recycled styrofoam coating is benefit to expand the application of waste styrofoam and the new anisotropic Janus compatibilizer. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 137 , 48691.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Hao Zhang,Zhengyuan Tao,Ziqi Yu,Tiantian Zhu,Hanlin Rao,Badusha Mohamad Ali,Jianli Wang
Pickering interfacial catalysts (PICs) have emerged as a promising solution for simultaneously enhancing and catalyzing liquid-liquid biphasic reactions. In this study, we successfully synthesized dumbbell-shaped Janus structured polymeric nanoparticles with one side anchored imidazolium-TEMPO (im-C 4 -TEMPO@JPP) as Pickering interfacial catalyst for the oxidation of alcohols using the Anelli-Montanari reaction system. In the Pickering emulsion system, the im-C 4 -TEMPO@JPPs particles are assembled at the W/O interface due to the hydrophilicity of imidazolium-TEMPO anchored lobe which enables excellent amphiphilic character of the polymeric Janus dumbbell. Moreover, the im-C 4 -TEMPO@JPPs particles reduce the interfacial tension from 27.82 to 18.43 mN/m. This excellent interfacial adsorption capacity of im-C 4 -TEMPO@JPPs strongly stabilizes the water/dichloromethane Pickering emulsion over two months (emulsion volume fraction >90 %), thus providing an efficient reaction platform for liquid-liquid biphasic reactions. As a result, the constructed Pickering emulsion system efficiently catalyzes the oxidation of cinnamyl alcohol to cinnamaldehyde under static conditions. After 1 hour of reaction, the conversion of cinnamyl alcohol achieved 97.1 % with a selectivity of 99 %, nearly the same level relative to stirring intensified biphasic reaction. Hence, this novel PIC effectively improves the efficiency and sustainability of liquid-liquid biphasic catalytic reactions .
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2016
·
IF 5.554
Huarong Nie,Cao Zhang,Yuewen Liu,Aihua He
In this paper, Janus hybrid particles with rubber brushes have been first fabricated by successively grafting polybutadiene chains onto polydivinylbenzene (PDVB) side and polyisoprene chains onto SiO2 side in the case of SiO2@PDVB Janus particles as the template. The weight grafting ratios (Gr) of polybutadiene (PBd) and polyisoprene (PI) brushes were determined as 19.4 and 24.8 wt %, respectively. Such Janus hybrid particles contribute to not only the retardation of phase separation but also the kinetically trapped bicontinuous phase morphology in rubber blends. The interface jamming of these Janus particles supports their promising applications as compatibilizers in polymer blends.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Ruotong Zhao,Xiaotian Yu,Dayin Sun,Liyan Huang,Fuxin Liang,Zhengping Liu
Snowman-like silica@PDVB/PS Janus particles were fabricated via seeded emulsion polymerization and modified with hydrophilic ionic liquid moieties. The Janus particles can readily be further modified by incorporating new functionalities through simple anion exchange. PW12O403– as a catalytically active species for dye degradation was introduced into the Janus particles, and the performance in the catalytic degradation of methyl orange was evaluated.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
Nanoscale
·
2020
·Vol. 12
·期 31
·16443-16450
·
IF 6.895
Yan Bao,Yuanxia Zhang,Jianzhong Ma
Durable superhydrophobic coating is attractive due to its long-term superhydrophobicity, anti-fouling and self-cleaning properties. However, the fabrication of durable superhydrophobic coatings on a fragile surface, including leather and paper, is still a challenge due to its bad resistance to harsh environments such as high temperature, high pressure and strong acid or strong base. Herein, we developed a universal way to fabricate long-lasting superhydrophobic coating on leather via amphiphilic Janus particles, which have one of the semispheres functionalized with hydrophobic 1-dodecanethiol and the other semisphere functionalized with hydrophilic β-mercaptoethylamine. Polyurethane with isocyanate end groups was sprayed on the leather surface as an intermediate layer to strongly link Janus particles with leather via cross-linking. Moreover, amphiphilic Janus particles were fabricated from hollow SiO2 particles via a thiol–ene click reaction due to its low density. The superhydrophobic coating on leather possessed a high water contact angle of 162.2°. Furthermore, it still retained excellent hydrophobicity with a water contact angle of 154° after 140 cycles of abrasion using sandpaper. This study not only provides a novel method for the fabrication of amphiphilic hollow SiO2 Janus nanoparticles, but also resolves the difficulties in constructing long-lived superhydrophobic coatings on fragile surfaces by existing methods. Meanwhile, the present study also suggests a potential way to translocate functional Janus microcapsules, which may give some significant suggestions on the future nanoparticle design for drug delivery and energy storage.
研究领域:
材料科学
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表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2013
·
IF 2.562
Qinhui Chen,Longhui Zheng,Baoling Chen,Jinhuo Lin
Janus particles possess heterogeneous surface chemistries which can potentially enhance their interfacial activity and be exploited as useful catalysis agent. It is challenging to control the geometry of the Janus particles and to produce Janus particles in large quantities. In this report, we use a general approach of emulsion swelling assisted protrusion to synthesize the Janus composite particles of titania – poly (vinylbenzyl chloride-divinylbenzene) (TiO 2 -poly (VBC–DVB)). The size of the lobe of poly (VBC–DVB) is tunable. After a series of reactions, including Kornblum oxidation reaction and Tollens’ reaction, the target product of TiO 2 –Ag Janus composite particles is obtained.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 3.371
Yang Hu,Yan Sun
Autonomous motion propelled by the reactions of enzymes asymmetrically immobilized on Janus particles have attracted great attention due to its possible auspicious application as active biocompatible platforms. However, no research has focused on the effect of the autonomous motion on enzyme reactions. Hence, this work was designed to fabricate different enzyme-immobilized particles with asymmetrical (Janus) and symmetrical enzyme distributions and to investigate the interplay between enzymatic reactions and their motion behavior with lipase and urease as model enzymes. It was found that all the EIPs displayed substrate-concentration-dependent enhanced diffusions, but Janus enzyme-immobilized particles exhibited maximum enhancement (60%) of autonomous motion represented by diffusion coefficient as well as superior specific activity increments (>2 times). Namely, the enzymatic reactions were more significantly facilitated by the autonomous motions of the Janus enzyme-immobilized particles. The results indicated that the asymmetrical enzyme distribution on Janus particles enhanced the favorable mutual promotion between the self-propelled movement and enzymatic reactions, leading to improved diffusional and enzymatic performance. The results have thus provided insights into the design of new materials for enzyme immobilization and novel immobilized enzyme systems for various applications.
研究领域:
生物化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 30
·23181-23188
·
IF 3.84
Wenxiu Li,Hua Dong,Guannan Tang,Ting Ma,Xiaodong Cao
Janus and microcapsule particles are very attractive for drug delivery applications due to their capability of targeted and/or programmed drug release. In this paper, a facile yet robust strategy is reported for the first time to fabricate both Janus and microcapsule particles in a simple microfluidic device via the same protocol. According to the classic spreading and partial wetting theory, the key point to fabricate Janus and microcapsule particles in single emulsions is that the two immiscible components should undergo a precisely controlled phase separation, i.e., dewetting for Janus particles and wetting for microcapsule particles. Herein we show that this requirement can be satisfied simply by a subtle choice of organic solvents for the dispersed phase. As a model hybrid material, PLGA/PCL Janus and microcapsule particles are obtained via switching the organic solvent between dimethyl carbonate and dichloromethane. ATR-FTIR spectra and acetone treatment demonstrate that PLGA and PCL occupy their own hemisphere in the Janus particles. In contrast, the shell on the microcapsule particle surface is composed of only PLGA, and the core is composed of PCL in which tiny PLGA beads are embedded. The applications of PLGA/PCL Janus and microcapsule particles in drug delivery are characterized via an in vitro degradation test. The results prove that Janus and microcapsule particles exhibit distinct degradation behaviors, implying their capability of programmable drug delivery in different manners.
研究领域:
生物医学工程
·
制药科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yingjie Zhang,Li Kang,Huajun Huang,Jianping Deng
Polymer Janus particles (PJPs) have been extensively investigated due to their intriguing features which cannot be achieved in traditional counterparts. Chiral polymer particles also have constituted a unique research area in polymer science. However, how to construct PJPs derived from chiral polymers, especially chiral helical polymers, still remains a significant academic challenge. This contribution reports the first success in preparing optically active PJPs constructed by chiral helical substituted polyacetylene via emulsion polymerization combined with solvent evaporation to induce phase separation. In emulsion polymerization systems, polymethyl methacrylate worked as a template and separated from polyacetylene domains in the course of acetylenic monomers’ polymerization and evaporation of the solvent, by which optically active PJPs were formed. The major influencing factors were explored to elucidate their effects on the formation and morphology of PJPs. Mushroom- and bowl-like PJPs were obtained. Scanning electron microscopy (SEM) images ascertain nonspherical morphologies of the obtained PJPs. Circular dichroism and UV–vis absorption spectra demonstrate their optical activity, which originated in the predominantly one-handed helical polyacetylene chains constructing the PJPs. A formation mechanism was then proposed for understanding this unprecedented type of PJPs.
研究领域:
高分子科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2015
·Vol. 26
·期 45
·455302
·
IF 3.821
Shirong Yu,Ying Chang,Conghui Yuan,Shuang Wang,Jie Mao,Guorong Chen,Weiang Luo,Yiting Xu,Lizong Dai
Exploitation of facile and versatile synthetic approaches to polymeric nanoarchitectures is of great interest in polymer science and engineering. Herein, we show that a simple hydrothermal route using double-solvents as reaction media has the ability to generate polymer nanospheres with tunable morphologies and components. In this one-pot approach, condensation polymerization of a resol precursor and radical polymerization of styrene are allowed to occur simultaneously under hydrothermal treatment. The synergistic self-organization of phenol-formaldehyde crosslinked networks and polystyrene chains leads to the formation of well-defined hollow nanospheres with adjustable shell thickness or even Janus particles comprising a solid hemisphere and a hollow hemisphere. Furthermore, control over the composition of the hollow polymer nanospheres can be easily achieved by introducing a third monomer into the hydrothermal system.
研究领域:
高分子科学
·
材料工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 9
·7355-7363
·
IF 3.201
Yanhua Sun,Tao Ren,Zhiwei Deng,Yanjing Yang,Shian Zhong
In this study, we successfully synthesized bovine hemoglobin (BHb)-imprinted polymers based on the molecular imprinting technique and BHb-coated Janus hydroxyapatite nanoparticle (BCJHP)-stabilized Pickering emulsions. For the first time, Janus hydroxyapatite nanoparticles (J-HAp) were synthesized successfully by partial masking with ultrapure water and further coating with BHb and then, they were employed as Pickering-type interfacial stabilizers to prepare the Pickering emulsions. Moreover, the effect of electrostatic charge density on the recognition properties was explored in depth using 2,2-bis(hydroxymethyl)propionic acid as the cationic monomer and 2-acrylamide-2-methylpropanesulfonic acid as the anionic monomer. Rebinding experiments of BHb onto MIPs (molecularly imprinted polymers) and non-imprinted polymers (NIPs) in a PBS solution of BHb were studied using a batch method. The results indicated that charged monomers could be used to improve the adsorption capacity, but they decreased the selectivity. Thus, we could assume that by adjusting the monomer composition, the charged monomers could further modulate the rebinding capacity and specificity. In conclusion, as reusable materials possessing good selectivity and high rebinding capacity, the imprinted polymers are promising for applications in the field of protein separation and purification.
研究领域:
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Wenqin Xu,Jiawen Chen,Shuning Chen,Qinhui Chen,Jinhuo Lin,Haiqing Liu
Janus hybrid particles (MPS-SiO2@PDVB-DM, JPs) were successively fabricated by grafting dodecyl mercaptan (DM) onto polydivinylbenzene (PDVB) lobe and 3-(trimethoxysilyl)propyl methacrylate (MPS) chains onto SiO2 lobe in the case of SiO2@PDVB Janus particles as the template. Moreover, MPS-SiO2@PDVB-DM Janus particles were used as the compatibilizer of immiscible polymer blends of liquid isoprene rubber (LIR) and epoxy resin (ER). The modified Janus particles were embedded in the interface of LIR and ER, which could improve the compatibility of LIR and ER, mitigating the macrophase separation in the blends. Besides, the compatibilizing effect of MPS-SiO2@PDVB-DM depends not only on the Janus molecular structure but also on the blending process and the curing agent of ER.
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
危险品化学品经营许可证（带存储）