Suspension Polymerization Method Research Articles

Temperature control for the synthesis of n-butylmagnesium bromide Grignard reagent based on n-octadecane/polystyrene microPCMs

Thermal runaway accounts for a high proportion of chemical safety accidents and poses a serious threat to the operational safety of personnel. Phase change materials (PCMs) have a high enthalpy of melting, if the latent heat energy of their phase change can be stored and used to absorb the heat released during thermal runaway, this phenomenon can provide a new approach for the control of reaction thermal runaway. In this work, microencapsulated phase change materials (microPCMs) were prepared by the suspension polymerization method using n-octadecane as the core material and polystyrene (PS) as the shell material. The prepared microPCMs had regular spherical morphologies with smooth surfaces, and the average particle size was 7.54 μm, the thermal conductivity was 0.05964 W/m∙K. The melting enthalpy of the microPCMs was 142.2 J/g, and the encapsulation percentage of the PCMs was 62.15%. The synthesis of the n-butylmagnesium bromide Grignard reagent occurred via a strong exothermic reaction, which was very likely to lead to overpressure venting once control was lost. The prepared microPCMs were applied as inhibitors in this reaction to investigate the temperature control effect under different operating conditions. The results showed that the amount of microPCMs added, and the timing of the addition affected the control effect. The addition of microPCMs could effectively reduce the reaction temperature and slow the rate of temperature increase. Even in the event of an emergency situation, such as a control failure, time could be gained for other emergency measures, effectively reducing the probability of thermal runaway accidents.

Assisting Bi2Fe4O9 nanosheets with CeO2@PANACSs macro-spheres as bifunctional supporter for enhanced photocatalytic CO2 reduction

The efficient capture of CO2 molecules is a crucial step in the light-driven CO2 synthesis of high value-added products. In this work, CeO2 is embedded in polyacrylonitrile-based carbon spheres (PANACSs) via a suspension polymerization and carbonization method to synthesise CeO2@PANACSs with bifunction (CO2 adsorption and reduction ablity), and the strong oxidising capacity Bi2Fe4O9 was coupled to obtain ternary Bi2Fe4O9/CeO2@PANACSs composites with high adsorption-reduction capacity for CO2. The effective synergistic effects between Bi2Fe4O9 and CeO2@PANACSs realize that the CO yield of ternary hybrid photocatalyst can reach as high as 256.1 μmol g−1 for 10 h, approximately 19.55 times, 1.45 times and 1.62 times higher than that of pristine PANACSs, Bi2Fe4O9 and CeO2, respectively. The exceptional performance of Bi2Fe4O9/CeO2@PANACSs composites is mainly attributed to the synergistic effect of the ternary system, which not only provides CO2-rich adsorption-reduction active sites but also effectively inhibits photogenerated electron-hole complexation. Meanwhile, the outer layer of Bi2Fe4O9 with its excellent oxidising capacity also provides a large amount of H* to ensure efficient hydrodeoxygenation of CO2. Finally, combined with the results of in situ fourier transform infrared spectra, a possible mechanism for the photocatalytic reduction of CO2 over ternary photocatalysts is proposed. Our finding provides a noteworthy promising strategy to construct bifunctional composite photocatalysts for achieving the high-efficient CO2 adsorption and photoreduction to CO.

Design, synthesis, and characterization of molecularly imprinted solid phase extraction for alpha Mangostin analysis in blood sample

AbstractLow levels of α‐mangostin (AM) in biological fluids require adequate sample preparation to be analyzed. Molecularly imprinted polymers can serve as sorbents in solid phase extraction, enabling concentration and extraction of α‐mangostin from complex matrices, such as biological fluids. To date, there are no molecular imprinted polymers for the analysis of α‐mangostin in biological fluids. In this study, AM molecular imprinted polymer (MIP) was designed using molecular modeling, molecular dynamic simulations, and prepared by bulk polymerization and suspension polymerization methods. The geometry optimization results showed that acrylamide (AAM) monomer forms the most stable complex with AM at the pre‐polymerization with the most negative Gibbs free energy (ΔG) of −6.91818 Kcal/mol. Radial distribution function (RDF) in molecular dynamics simulation of AM:AAM:ethylene glycol dimethacrylate (EGDMA) with mol ratio 1:4:20 shows the complex with the best composition through the formation of four stable hydrogen bonds. Based on the experimental results, molecularly imprinted polymers in suspension exhibit better characteristics, selectivity, and adsorption capacity than in bulk. The suspension polymerization method showed a high recovery (85.88% ± 2.5), which was higher than C18 SPE cartridge (24.19% ± 1.47). Hence, it can be concluded that the MIPs from MD simulations were accessible and could be used in practice, such as in the separation and detection of AM in blood serum.

MXene/PDMS composite foam with regulatable cell structures for improved EMI shielding performance

AbstractThe construction of conductive network and the design of material structure are the key points of polymer‐based shielding materials. Herein, we reported a MXene/PDMS composite foam material with adjustable cell structure and high efficiency electromagnetic interference (EMI) shielding. Few‐layered MXene is used as a conductive filler to construct three‐dimensional conductive networks by in situ chemical etching. Meanwhile, a series of polystyrene microspheres with different sizes were prepared by applying suspension polymerization method as templates to introduce different cell sizes and densities for PDMS‐based materials. The density and EMI shielding performance of composites can be improved by adjusting the cell structure. Compared with the unfoamed MXene/PDMS composites, the composite foam in this work not only reduces the material density greatly but also improves the microwave absorption performance with smaller cell size. This method provides a simple and effective guide for changing material density and absorbing mechanism by introducing cell structure into polymer‐based materials in the future.

АНАЛИЗ СИСТЕМЫ ВОДОСНАБЖЕНИЯ ПРОИЗВОДСТВ ВСПЕНИВАЮЩЕГОСЯ ПОЛИСТИРОЛА

The scheme of water supply of the industrial site for the production of foaming polystyrene by the method of suspension polymerization is analyzed. The amount of suspended solids in the re-cycled water of this production has been experimentally determined, and a possible method of its purification has been proposed. The relevance of this work lies in the efficient use of energy resources, as well as ensuring the highly efficient operation of heat exchange equipment

Suspension polymerization method for preparing plastic scintillation microspheres

Suspension polymerization method for preparing plastic scintillation microspheres

Degradation Kinetics of Disulfide Cross-Linked Microgels: Real-Time Monitoring by Confocal Microscopy.

Although biodegradable microgels represent a useful drug delivery system, questions remain regarding the kinetics of gel degradation and subsequent drug release. Spherical microgels (~Ø10-300 µm) were synthesized using an inverse suspension polymerization method. Specifically, acrylamide and acrylonitrile monomers were thermally co-polymerized with N,N'-bis(acryloyl)cystamine as a cross-linker with disulfide bridges. The kinetics and mechanism of degradation of these cross-linked, degradable, fluorescently labeled microgels (PAAm-AN-BAC-FA) were quantitatively studied under confocal microscopy at various concentrations of glutathione (reducing agent) ranging from 0.06 to 91.8 mM. It was found that polymer network degradation via the cleavage of disulfide bonds was accompanied by two overlapping processes: diffusion-driven swelling and dissolution-driven erosion. A slow increase in microgel size (swelling) resulted from partial de-cross-linking in the bulk of the microgel, whereas a faster decrease in fluorescence intensity (erosion) resulted from the complete cleavage of disulfide bonds and the release of uncleaved polymeric chains from the microgel immediate surface into the solution. Swelling and erosion exhibited distinct kinetics and characteristic times. Importantly, the dependence of kinetics on glutathione concentration for both swelling and erosion suggests that degradation would occur faster in cancer cells (higher concentration of reductants) than in normal cells (lower concentration of reductants), such that drug release profiles would be correspondingly different. A greater comprehension of microgel degradation kinetics would help in (i) predicting the drug release profiles for novel multifunctional drug delivery systems and (ii) using redox-sensitive degradable hydrogel particles to determine the concentrations of reducing agents either in vitro or in vivo.

Chemical and Process Inherent Safety Analysis of Large-Scale Suspension Poly(Vinyl Chloride) Production

In this work, a safety assessment was carried out for the suspension polymerization method, known for the lack of studies about its sustainable performance and long history of chemical accidents. Therefore, a safety analysis was conducted using the inherent safety methodology to assess and determine the inherent risks of the poly(vinyl chloride) (PVC) suspension production process using computer-aided process engineering (CAPE). The indicators were calculated using data from safety databases and the specialized literature, considering downstream stages like vinyl chloride monomer (VCM) recovery, PVC purification and PVC drying. The obtained indicators revealed that the process has a negative performance regarding inherent safety, with a total inherent safety index of 30. The chemical inherent safety index had a value of 19, with the main chemical risk of the process being presented by the vinyl chloride monomer (with a value of 11), along with the risk of the exothermic reactions. The process safety index had a value of 15, highlighting the inventory as the primary concern of the process (with a value of 5), followed by the presence of unsafe equipment such as furnaces, burners, and dryers. The safety structure index had a score of 3, categorizing the process as probably risky, with the reaction and purification stages being more susceptible to accidents. Lastly, it is recommended to reduce the size of the process inventory and to substitute out unsafe process units.

Microencapsulated waste cooking oil derivatives for building thermoregulation

The utilization of waste resources and the intelligence of building materials are of great significance to the sustainable development of human society. A novel type of microencapsulated phase change material (MPCM) with a phase change heat storage capability was prepared in this paper through the suspension polymerization method using methyl palmitate (MP) derived from waste cooking oil as core materials. Meanwhile, the response of foamed concrete containing MPCM to ambient temperature change was investigated. According to the experimental findings, the MPCM's phase change temperature, phase change enthalpy, and decomposition temperature are respectively 20 °C, 68 J/g, and 215 °C, which is extremely suitable for the external walls of buildings to adjust the indoor temperature. Moreover, the particle size of the MPCM is about 100 μm-220 μm, which can fill part of the voids in foam concrete to increase its strength. Additionally, the infrared thermal imaging experiment indicates that the foam concrete containing 10 wt% MPCM can maintain 4 °C-5 °C gap with the ambient temperature, which demonstrates that the MPCM can significantly mitigate the impact of ambient temperature on buildings. The findings of the study contribute to the intellectualization of building materials and the recycling of waste resources.

In situ suspension polymerization of vinyl chloride/3-(trimethoxysilyl) propyl methacrylate (MPTMS) intercalated Mg-Al-layered double hydroxide: II. Morphological, thermal properties and diffusion behavior

A series of PVC composites were produced using an in-situ suspension polymerization method with an optimal amount of 5 wt% of MgAl(NO3) layered double hydroxide (LDH) or LDH-MPTMS, which is MPTMS-intercalated Mg-Al LDH. The physical, mechanical, and thermal properties of the composite samples were compared to pure PVC. Results from the Brabender® plastograph showed that the PVC grains produced with LDH-MPTMS had a longer thermal stability time and shorter fusion time. The addition of LDH-MPTMS nanosheets increased the gelation degree of PVC particles, resulting in a lower temperature/time requirement for processing. The thermal stability of the composite material was confirmed through a standard dehydrochlorination test, which demonstrated a 40% improvement in dehydrochlorination rate compared to pure PVC. This improvement was 12% higher than that observed in the PVC/LDH composite. TGA curves indicated a significant increase in the 5 and 50% weight loss temperatures of PVC resins with the addition of 5wt% LDH or LDH-MPTMS, with an approximate growth of 11°C. The glassy state storage modulus and Tg of the PVC/LDH-MPTMS composite were higher than those of pure PVC and the PVC/LDH composite. Mechanical analysis revealed that the PVC/LDH-MPTMS composites exhibited greater stiffness and toughness, as well as significantly higher Charpy notched impact strength, tensile strength, and Young’s modulus compared to both the PVC/LDH composite and pure PVC.

Design and Preparation of Magnetically-Oriented Poly(styr-co-MMA)-3MPS Capped Fe(ZnO) Hybrid Microspheres for Ion Exchange Removal of Toxic Pollutants from Wastewater

In this work, polymeric microspheres derived from polystyrene-co-methyl methacrylate embedded with magnetic ZnO nanoparticles (poly(styrene-co-MMA)-3MPS-Fe (ZnO)) were synthesized using the suspension polymerization method. The surfaces of polymeric Fe(ZnO) microspheres were improved by functionalization with amino and sulphonate groups. The physicochemical analysis indicated a large number of positively charged (anion exchange) groups (91 mmol/g) on the amine-modified polymeric microsphere (MFZPI) and a large number of negatively charged (cation exchange) groups (90 mmol/g) on the sulphonate-modified polymeric microsphere (SMFZPI)—revealing ambivalent character of obtained sorbent. The characterization of the synthesized compounds using various analytical techniques such as TGA, FTIR, XRD, SEM/EDX, UV-VIS and VSM indicated that synthesized microspheres were thermally stable, semi-crystalline in structure with hollow irregular morphology, optically active in UV region and slightly magnetic in nature. Due to the introduction of groups having ion exchange properties, these modified poly(styrene-co-MMA)-3MPS-Fe(ZnO) microspheres were used for the ion exchange sorptive removal of Cr(III) and fluorescein from aqueous matrix. The equilibrium sorption capacity of Cr(III) was 16.79 mg/g whereas of fluorescein was 12.03 mg/g under optimized conditions. Therefore, SMFZPI was found to be a promising sorbent for both cationic heavy metals and anionic dyes due to the presence of both acidic and basic groups. The mathematical modelling revealed that the sorption phenomenon followed pseudo-second-order kinetics with Freundlich equilibrium isotherm, indicating multilayer chemisorption of the pollutants on the synthesized ion exchange sorbents. This work establishes the utilization of polymeric magnetic ZnO-based ion exchange sorbents to effectively remove harmful toxins from wastewater.

Design of an imaging magnetic microsphere based on photopolymerization for magnetic hyperthermia in tumor therapy.

Magnetic hyperthermia therapy has been widely used in the nonsurgical treatment of patients with advanced stage cancers that cannot be treated by surgery. It is minimally invasive, precise, and highly efficient and has a good curative effect. In this paper, a magnetic microsphere with Fe3O4 was prepared for thermal therapy and imaging based on a photoinitiated suspension polymerization method from biallelic monomers. The preparation method clearly minimized the degradative chain transfer of allyl polymerization reactions. The microspheres were characterized by microscope observation, spectral analysis, thermal analysis, and magnetic testing. The magnetothermal effect was detected by an infrared thermal imager in vitro and in vivo under a high-frequency alternating magnetic field (AMF). The antitumor effect was verified by testing the viability of H22 cells and observing a tumor-bearing mouse model under high-frequency AMF. Biocompatibility was evaluated by cell viability assay, tissue section observation, and blood biochemical analysis. The imaging capacity was tested by X-ray, MRI, and CT imaging experiments. The results show that the product has good dispersibility, thermal stability, superparamagnetism, and biocompatibility. Under the action of an AMF, the magnetic hyperthermia effect in tumor-bearing mice was better, and an antitumor effect could be achieved.

Preparation and pH Detection Performance of Rosin-Based Fluorescent Polyurethane Microspheres.

Rosin-based fluorescent polyurethane emulsion (FPU) was prepared using isophorone diisocyanate, ester of acrylic rosin and glycidyl methacrylate, 1,5-dihydroxy naphthalene (1,5-DN), and 1,4-butanediol as the raw materials. Then, rosin-based fluorescent polyurethane microspheres (FPUMs) were successfully prepared by suspension polymerization method using FPU as the main material, azodiisobutyronitrile as the initiator, and gelatin as the dispersant. FPUMs were characterized by Fourier transform infrared spectra, thermogravimetric analysis, optical microscopy, scanning electron microscopy and fluorescence spectra, and the response performance of FPUMs to pH was studied. The results showed that FPUMs were successfully prepared. With the increase of the level of 1,5-DN, the particle size of FPUMs increased gradually, and the fluorescence intensity increased first and then decreased. When the level of 1,5-DN was 3 wt.%, the average particle size was 49.3μm, the particle distribution index (PDI) was 1.05, and the fluorescence intensity was the largest (3662 a.u.). The fluorescence intensity of FPUMs increased linearly with the decrease of pH, which can be used for pH detection in solution. Furthermore, the FPUMs exhibited good thermal stability, anti-interference and recoverability.

Micron sized anionic poly (methacrylic acid) microgel particles for the adsorptive elimination of cationic water pollutants

Abstract In this article, we reported the micron sized particles of poly (methacrylic acid) (p [MAA]) microgel and explored their applications as anionic adsorbents. The micron sized particles of poly (methacrylic acid) microgel were prepared by a simple inverse suspension polymerization method. The adsorptive elimination of adsorbates of cationic nature including malachite green (MG) and methylene blue (MB) from the aqueous medium was studied systematically. The adsorption tests were carried out using various initial concentrations of dyes and with different amounts of adsorbents. The adsorption equilibrium was established in 60 min. The adsorption capacity of the p (MAA) microgel was found as high as 351 mg/g for MG and 65 mg/g for MB. The maximum removal percentage for MG and MB was recorded as 88 and 68%, respectively. The adsorption data was computed with adsorption isotherm models including Langmuir, Freundlich, and Temkin. The Langmuir model was observed to be more applicable for the adsorption of MG while the adsorption of MB was best matched with Temkin model. The adsorption data was also treated with pseudo first order and pseudo second order kinetic models along with intraparticle diffusion and Elovich models. The pseudo second order kinetic model was most suitable with adsorption of both the MG and MB.

Synthesis of Crosslinked Poly(Vinylphosphonic Acid) Particles by Water-in-Oil (W/O) Suspension Polymerization Method and Their Adsorption Properties of Metal Ions

Crosslinked poly(vinylphosphonic acid) (PVPA) particles were successfully synthesized from vinylphosphonic acid and a crosslinker by water-in-oil (W/O) suspension polymerization using three silicone oils. The structure, morphology, and size of the PVPA particles were confirmed by Fourier transform infrared spectroscopy, scanning electron microscopy, and optical microscopy. The surface of the spherical particles was wrinkled, and their size ranged from 5 – 260 µm. The adsorption of divalent and trivalent metal ions (Cu2+, Zn2+, La3+, Tb3+, Lu3+) from aqueous solutions was studied using the synthesized PVPA particles under batch conditions at various metal ion concentrations and pHs for the first time. For all metal ions, pH-dependent adsorptions were observed. Partial charge neutralization of metal ions occurred because the PVPA particles are highly hydrophilic. The extraction efficiencies of La3+, Tb3+, and Lu3+ are higher than those of Cu2+ and Zn2+. The separation ability for La3+, Tb3+, and Lu3+ is not so high, but they can be used for the group extraction of these metal ions.

Evaluation of crystallinity, thermal, mechanical and morphological features of high density polyethylene composites reinforced with crosslinked semifluorinated acrylate polymer microspheres

This study mainly aims both to prepare well-shaped crosslinked 3,3,4,4,5,5,6,6,7,7,8,8,8 tridecafluorooctyl-4-(acrloyloxy) benzoate (ABCF13) polymer microspheres and to investigate the influences of the prepared microspheres addition on the crystallinity, thermal, mechanical and morphological features of high density polyethylene (HDPE). The suspension polymerization method was used for the production of well-defined microspheres and, the content of the microspheres varied from 1.0% to 10.0% in the composites. The characterization of crosslinked poly(ABCF13) microsphere-loaded HDPE composites were performed via powder X-ray diffraction, differential scanning calorimeter, universal mechanical (tensile and impact) testers and scanning electron microscope (SEM) techniques. According to the experimental findings, a and b unit cell parameters increased initially and reached maxima with the sample including 5.0% microsphere, which were followed by dramatic decreases, while c parameter remained relatively unchanged. Thermal analysis also showed that the melting temperature of HDPE reduced with the initial loading of the microspheres, then stayed at a plateau value of about 129°C due to the formation of lattice distortions, generation of microstructural disorders and the defects in the crystal structures. The mechanical test results revealed that there existed considerable improvements in tensile strength, modulus and impact strength. The maximum tensile strength 25.66 MPa, elastic modulus 499.30 MPa and maximum absorbed energy in the impact test 26.84 kJ/m2 (29%, 42% and 41% improvement, respectively) were achieved with the blend involving 5.0% microsphere. After the maxima, the mechanical characters depicted weakening trend as the microsphere content increased in the matrix. The SEM analyses revealed that although there existed fibrillar formations in all samples, the extensions decreased with the increase of the microsphere content. While ductile behavior was observed with the formation of long-bulky extensions at low contents, brittleness started to prevail at high contents with some short and thin fibrils.

Formulation and evaluation of dapsone loaded microsphere incorporated gel delivery system

The present study was aimed to control and prolong the release of Dapsone by formulating and microspheres and incorporating in to gel dosage form for topical application with a reduced frequency of application and hence lesser known side effects. The microspheres were prepared using suspension polymerization method. An increase in concentration of the polymer was found to increase the particle size along with the amount of entrapped drug. The surface of the microspheres was found to be smooth. In vitro drug release of microspheres exhibited a biphasic release pattern with an initial burst release effect. The release kinetics data best fitted with first order kinetics and the Higuchi matrix data was able to explain the controlled release of drug from the microspheres. The gel formulations made from the microspheres (DM4, (drug: polymer, 1:4)) possessed all the physicochemical evaluation parameters within acceptable limits. The in vitro diffusion data made it evident that the gel formulation with 1.0% HPMC, loaded with DM4 was able to release about 68% drug at the end of 24 hours.

Synthesis of water-compatible noncovalent imprinted microspheres for acidic or basic biomolecules designed based on molecular dynamics

Molecularly imprinted polymers (MIPs), as selective adsorbents, have shown great potential in the selective separation and enrichment of trace targets from complex components. However, the preparation of MIPs with specific recognition in aqueous solution is facing great challenges, thus largely limiting their application scope in selective separation and analysis of water samples. Aiming at the challenges and problems in the above-mentioned molecularly imprinting technology, a new rational method of water-compatible noncovalent imprinted microspheres was proposed. In the method, functional monomers were screened based on molecular dynamics (MD) and then water-compatible spherical MIPs were prepared with a modified suspension polymerization method. To verify this method, a basic molecule (spiramycin) and an acidic molecule (chenodeoxycholic acid) were selected as templates. After the characterization of the synthesized polymers, the adsorption capacities of SPM-MIP and CDCA-MIP were tested in an aqueous environment. In adsorption experiments, CDCA-MIP and SPM-MIP showed higher adsorption capacities and the imprinting factors of CDCA-MIP and SPM-MIP reached 3.96 and 2.51, respectively. Due to the imprinting effect, the prepared SPM-MIP and CDCA-MIP had selectivity. Moreover, SPM-MIP and CDCA-MIP showed the strong protein adsorption resistance in an aqueous medium. These results confirmed that the reasonable design was feasible and significant in designing water-compatible non-covalent imprinted polymers. In addition, the screening strategy of imprinting systems proposed in this study has certain universality and can be widely used to screen various imprinting systems. • 1、Theoretical investigation on the noncovalent MIPs used in aqueous environment. • 2、A modified suspension polymerization was proposed to synthesize CDCA-MIP and. • SPM-MIP. • 3、CDCA-MIP and SPM-MIP had high adsorption capacity, selectivity and reusability. • 4、CDCA-MIP and SPM-MIP showed strong anti-protein adsorption in aqueous environment. .

Floating Microsponge: An Emerging Drug Delivery System

Floating microsponges are a method to extend gastric residence time, there with the aid of using concentrated on site-responsive medicament liberate withinside the top GIT for locally or systemic effect. Gastro retentive dosage forms (GRDFs) are getting utilized from a totally long term to enhance treatment with numerous main medications. Floating microsponge significantly enhances the therapy of stomach with the aid of using liberating the medication locally and for that reason used for medication selecting at specific organ. This may be sustained over an extended period of time. Floating drug delivery allow extended and non-stop release of the drug to the top a part of Gastro intestinal tract and this expressively amplify the period of drug release and enhance pharmacokinetic of medication which have slim healing window, with the aid of using this method dosing frequency and affected person compliance is increased. A microsponge’s drug delivery system is a particularly cross-linkage, spongy, polymeric microsphere, polymeric device consisting permeable microspheres. Microsponges are prepared with the aid of using numerous techniques consisting of liquid-liquid suspension polymerization and quasi emulsion solvent diffusion method. Microsponge,s preparations are strong over variety of pH 1 to 11; microsponge,s preparations are strong on the temperature as much as 1300C well suited with maximum vehicles and ingredients. The present assessment introduces microsponge,s technology at the side of its techniques of preparation, characterization, advantages, evaluation and release mechanism of microsponge,s drug delivery system, advertised product and up to date studies regarding microsponge.
 Keywords: Floating microsponge, Oral administration, Controlled release, Quasi emulsion, Target release.

Synthesis and CO2 Capture of Porous Hydrogel Particles Consisting of Hyperbranched Poly(amidoamine)s.

We successfully synthesized new macroporous hydrogel particles consisting of hyperbranched poly(amidoamine)s (HPAMAM) using the Oil-in-Water-in-Oil (O/W/O) suspension polymerization method at both the 50 mL flask scale and the 5 L reactor scale. The pore sizes and particle sizes were easily tuned by controlling the agitation speeds during the polymerization reaction. Since O/W/O suspension polymerization gives porous architecture to the microparticles, synthesized hydrogel particles having abundant amine groups inside polymers exhibited a high CO2 absorption capacity (104 mg/g) and a fast absorption rate in a packed-column test.