Solventless preparation of ammonium persulfate microcapsules with a polypyrrole shell

Zuo, Mingming; Yuan, Xuzhou; Wang, Sijie; Zhu, Wangwang; Zuo, Xingtao; Geng, Fang

doi:10.1007/s10853-018-03217-6

Cited by 8 publications

(3 citation statements)

References 41 publications

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“…Physicochemical methods utilize differences in the physicochemical properties of polymers, such as adjusting temperature, pH, etc., to precipitate the shell material out of solution and encapsulate the breaker. Zuo et al 162 reported a new one-step synthesis method to rapidly encapsulate watersoluble APS into microcapsules using petroleum resin doped polypyrrole as a shell layer, and the release time of the microcapsules was affected by the resin type and temperature. Meng et al 163 used a polydimethylsiloxane (PDMS)-induced acrylonitrile-butadiene-styrene (ABS) polymerization encapsulated with potassium persulfate (KPS) to produce a micronsized capsule breaker, which could maintain an apparent viscosity of fracturing fluids of more than 50 mPa s for 100 min at 70 °C.…”

Section: Oxidation Breakingmentioning

confidence: 99%

Progress and Prospects of In Situ Polymer Gels for Sealing Operation in Wellbore and Near-Well Zone

Kang,

Liu,

Jia

et al. 2024

Energy Fuels

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In situ polymer gels have been received as a useful tool for sealing operations such as fluid loss control during well drilling and workover and completion, well stimulation, water shutoff, wellbore integrity, and wellbore pressure management. With the development of deep-sea, deep-earth, and unconventional reservoirs, various harsh conditions such as high temperature, high pressure, and complex working conditions pose great challenges to the performance of gels. This paper first summarizes the application and operating mechanism of in situ polymer gels for sealing operations in wellbore and near-wellbore zones. Then, the in situ polymer gels are categorized into three types, in situ monomer gels, in situ cross-linked gels, and in situ generated foam gels, and the advantages and disadvantages of these three types of gels are introduced. Second, an overview of performance improvement methods for in situ polymer gels is highlighted, including improved temperature resistance and strength, accelerated gelation, retarded gelation, gel-breaking methods, and self-degradation systems. Finally, the challenges and prospects of in situ polymer gels for sealing operation in wellbores and near-well zones are presented, to provide references for the application, formulation, and performance improvement of in situ polymer gels.

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Section: Oxidation Breakingmentioning

confidence: 99%

Progress and Prospects of In Situ Polymer Gels for Sealing Operation in Wellbore and Near-Well Zone

Kang,

Liu,

Jia

et al. 2024

Energy Fuels

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“…A FEI TECNAI G20 transmission electron microscope (TEM) detected specimen' microstructure at an acceleration voltage of 200 KV [21,22]. Thermogravimetric analysis of CNTs and nano-capsules was conducted using an STA449 thermal analyzer with a temperature range of 20-800 • C and a rise rate of 20 • C/min, and the atmosphere was N 2 with a flow rate of 40 mL/min [23].…”

Section: Preparation Of Peek Compositesmentioning

confidence: 99%

Self-Lubricating Properties of Polyether-Ether-Ketone Composites Filled with CNTs@RC2540 Nano-Capsules

Guan,

Xu,

Zheng

et al. 2023

Lubricants

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Polyether-ether-ketone (PEEK) exhibits great potential in being a replacement for metal components across various applications relying on the mechanical and tribological properties. However, there is still much to be done to improve its properties. The main motivation of this paper is to improve the tribological and mechanical properties of PEEK simultaneously for more severe working environment. Therefore, dialkyl pentasulfide (RC2540) was proposed to fill into the cavity of CNTs to prepare nano-capsules, which were then filled into PEEK to prepare PEEK/nano-capsules composites. The existence of nano-capsules in PEEK was analyzed, and the friction and wear properties exhibited by PEEK composites against GCr15 steel were examined using pin-disk friction pairs, and the self-lubricating mechanism of PEEK composites in friction was revealed. Findings of this study indicated that when the mass fraction of nano-capsules was less than 5%, the filling of nano-capsules could improve the tensile strength of PEEK and reduced the friction coefficient and specific wear rate of PEEK by filling nano-capsules. During the friction process, RC2540 in the nano-capsules can be released as PEEK wears so that a self-lubricating layer can be formed for reducing PEEK composites’ friction and wear.

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“…Because of the different surface properties of the inorganic shell microcapsules and the polymer matrix, inorganic–organic incompatibility problems may arise. It is interesting to know that organic shell microcapsules have some benefits, such as flexible structures, high chemical stability, good permeability resistance, and strong force with the polymer matrix. − Yang et al microencapsulated bifunctional linseed oil within a PU shell by interfacial polymerization and prepared epoxy coatings with different concentrations of microcapsules. The results of friction wear show that the concentration of microcapsules is above 10 wt %, and the friction coefficient of the composite coating is reduced by 86.8% compared with that of the pure epoxy coating.…”

Section: Introductionmentioning

confidence: 99%

Novel Polyurethane Elastomer Modified by Hybrid Shell Nano-/Microcapsules for Unique Self-Lubricating Behavior

Jia

Liu

Zhang

et al. 2020

Ind. Eng. Chem. Res.

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Self-lubricating microcapsules containing liquid paraffin as the core material were successfully synthesized with polyurethane (PU)/silica (SiO2) as the hybrid shell material using a sol–gel process and an interfacial polymerization method. The self-lubricating microcapsules were adopted as the filling matrix, which was compounded with the PU elastomer through an in situ polymerization method to improve the self-lubricity of the PU elastomer. The self-lubricating properties of the PU composites with different mass fractions of microcapsules have been characterized by a plastic sliding friction and wear tester. The particle size of spherical microcapsules is about 540 nm and it can effectively reduce the friction coefficient and wear of PU materials. When the concentration of self-lubricating microcapsules is 1.2 wt %, the PU composite has the lowest average friction coefficient of 0.301. The friction coefficient and wear of composite materials reduce by 64.8 and 66.7% compared to those of pure PU elastomers. Meanwhile, the PU composites show better thermal stability and mechanical properties. The thermal decomposition temperature, tensile strength, and elongation at break increased by 4.6, 69.1, and 30.8%, respectively, which extended the service life of the PU elastomer in special fields. Finally, the friction and wear mechanism of the PU composites was discussed with scanning electron microscopy images. It was confirmed that by virtue of the flexible structure of the microcapsule shell material and the release of core materials, the friction and wear mechanism of PU composites changes from severe fatigue wear and adhesive wear to slight adhesive wear.

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Solventless preparation of ammonium persulfate microcapsules with a polypyrrole shell

Cited by 8 publications

References 41 publications

Progress and Prospects of In Situ Polymer Gels for Sealing Operation in Wellbore and Near-Well Zone

Progress and Prospects of In Situ Polymer Gels for Sealing Operation in Wellbore and Near-Well Zone

Self-Lubricating Properties of Polyether-Ether-Ketone Composites Filled with CNTs@RC2540 Nano-Capsules

Novel Polyurethane Elastomer Modified by Hybrid Shell Nano-/Microcapsules for Unique Self-Lubricating Behavior

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