Bijels stabilized by amphiphilic random polymer self-assembled aggregates prepared by one-step emulsification method

Abstract

The application discloses a preparation of Bijels by a one-step emulsification method, and belongs to the technical field of emulsion preparation. The application adopts amphiphilic random polymer poly(styrene-co-methacrylic acid) (P(St-co-MAA)), which realizes self-assembly to form aggregates by pH control. Then, the P(St-co-MAA) aqueous solution is used as the water phase, mixed with the oil phase, and high-speed emulsified to obtain a double-continuous emulsion gel (Bijels). The Bijels have good stability, and can be used in the fields of slow-release microcapsules, electrochemistry, food processing, functional materials, biological medicine and the like.

Description

Technical Field

[0001] This invention relates to a one-step emulsification method for preparing Bijels, which are stable by self-assembly of amphiphilic random polymers, and belongs to the field of emulsion preparation technology. Background Technology

[0002] Traditional emulsions consist of two immiscible liquids. One liquid phase is dispersed as droplets in the continuous phase by a surfactant, typically a low-molecular-weight surfactant or an amphiphilic polymeric emulsifier. Newer emulsions, also known as Pickering emulsions, use solid particles to stabilize the interface between the two phases. Compared to traditional emulsions, they offer longer storage stability, lower toxicity, and better biocompatibility. Both traditional and Pickering emulsions are oil-in-water (O / W), water-in-oil (W / O), and multiple emulsions, all containing dispersed droplets. In certain special cases, both immiscible fluids exist as continuous phases, with no dispersed phase. The two phases are arranged in a bicontinuous manner, with solid particles or surfactants stabilizing the system at the liquid-liquid interface. The resulting emulsion is called a bicontinuous emulsion, and due to its gel-like properties, it is generally referred to as a bicontinuous emulsion gel (Bijels). Because the emulsifier has both positive and negative curvature at the two-phase interface, Bijels not only exhibits efficient and continuous mass transfer and supply in both oil and aqueous phases, but also provides an ideal platform for applications that rely on two-phase interface transport, such as battery electrodes, multiphase catalysis, filtration membranes, and chemical reactors.

[0003] Initially, bicontinuous emulsion channels were achieved through phase separation processes involving two immiscible liquids: thermal quenching, solvent transfer, and vaporization-induced phase separation. Thermal quenching-induced phase separation requires precise temperature control, while the other two methods necessitate the use of a co-solvent. During phase separation, interfacial tension increases with the difference in composition between the two phases, prompting colloidal particles to transfer from one phase to the interface, forming a rigid blocking layer. Once phase separation is complete, a Pickering emulsion with a unique structure (interpenetrating oil and water phases) is obtained.

[0004] Currently, Bijels can be prepared by direct mixing, including two-step mixing and one-step mixing. Dongyu Cai (Cai D, Clegg PS, Li T, et al. Bijels formed by direct mixing[J]. Soft matter,2017,13(28):4824-4829.) et al. prepared Bijels by mixing glycerol and silicone oil in a two-step mixing method: hexadecyltrimethylammonium bromide (CTAB) was dissolved in glycerol containing silica nanoparticles to complete the combination of particles and surfactants and modify the particle emulsifier. A certain volume of mixed viscosity silicone oil was added and slow stirring was performed with a magnetic stir bar to obtain glycerol droplets. Then, vigorous mixing was performed to shear the droplets to generate additional interfaces. The nanoparticles blocked the interfaces and formed a bicontinuous structure. Caili Huang (Huang C, Forth J, Wang W, et al. Bicontinuous structured liquids with sub-micrometre domains using nanoparticle surfactants[J]. Nature nanotechnology, 2017, 12(11): 1060-1063.) et al. successfully prepared submicron-sized Bijels by combining SiO2 with hydrophilic carboxylic acid-functionalized polystyrene (PS-CO2H) and hydrophobic amine-functionalized polydimethylsiloxane (PDMS-NH2) to stabilize the water-toluene interface.

[0005] It is evident that the preparation method of Bijels has been greatly optimized. However, most preparations of Bijels utilize particulate emulsifiers such as SiO2, Janus, and nanocrystals as stabilizers at the two-phase interface. Appropriate surface modification is required to adjust their wettability, including covalently linking hydrophobic or hydrophilic groups or physically adsorbing cationic or anionic surfactants, multivalent ions, or polyelectrolytes. The hydrophilicity or hydrophobicity of the particulate emulsifier is reflected by its three-phase contact angle θ at the two-phase interface. When θ < 90°, the particles are highly hydrophilic and readily form O / W emulsions; when θ > 90°, W / O emulsions are easily formed; when θ is near 90°, the particles exhibit equal wettability in both liquid phases, producing zero curvature and bicontinuous liquid regions to form bicontinuous emulsions. However, successful preparation of Bijels requires careful modification of the particle surface to adjust its wettability, which increases the complexity of the preparation process.

[0006] Currently, although there are reports on the preparation of bicontinuous emulsions using a one-step mixing method, no reports have been found on the preparation of Bijels using amphiphilic polymers as oil-water interface stabilizers. Summary of the Invention

[0007] [Technical Issues]

[0008] Bijels often use particulate emulsifiers such as SiO2, Janus, and nanocrystals as stabilizers at the interface between the two phases during preparation. The particle surface needs to be carefully modified to adjust its wettability, which is a complex operation.

[0009] There are currently no reports of using amphiphilic polymers as oil-water interface stabilizers to prepare Bijels.

[0010] [Technical Solution]

[0011] To address the aforementioned issues, this invention employs the amphiphilic random polymer poly(styrene-co-methacrylic acid) (P(St-co-MAA)), which achieves self-assembly into aggregates through pH adjustment. Subsequently, an aqueous solution of P(St-co-MAA) is used as the aqueous phase and mixed with the oil phase for high-speed emulsification to obtain bicontinuous emulsion gels (Bijels). The Bijels of this invention exhibit good stability and can be used in sustained-release microcapsules, electrochemistry, food processing, functional materials, biomedicine, and other fields.

[0012] The first objective of this invention is to provide a one-step emulsification method for preparing Bijels stabilized by self-assembled aggregates of amphiphilic random polymers, comprising the following steps:

[0013] The pH of the P(St-co-MAA) aqueous solution was adjusted to 6.6-8.4 to obtain the aqueous phase; the aqueous phase and oil phase were mixed and emulsified at high speed to obtain Bijels.

[0014] In one embodiment of the present invention, the concentration of the P(St-co-MAA) aqueous solution is 0.5-1.5% (w / v, g / 100mL), more preferably 1% (w / v, g / 100mL).

[0015] In one embodiment of the present invention, the P(St-co-MAA) aqueous solution is prepared by dissolving P(St-co-MAA) in NaOH solution, wherein the NaOH solution is an aqueous solution of NaOH with a concentration of 0.1 mol / L.

[0016] In one embodiment of the present invention, P(St-co-MAA) is prepared according to the reference (Zhang Y, Du H, Wang Y, et al. pH-regulated self-assembly of poly(styrene-co-methacrylic acid) for fabrication of pH-responsive Pickering emulsion[J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2025: 136231.).

[0017] In one embodiment of the present invention, the pH of the P(St-co-MAA) aqueous solution is adjusted to 7.0-8.0.

[0018] In one embodiment of the present invention, the oil phase is one or more of high-viscosity silicone oil, glyceryl caprylate (GTCC), and paraffin; the viscosity range of the high-viscosity silicone oil is 50 cst-100 cst.

[0019] In one embodiment of the present invention, when the oil phase is paraffin, the aqueous phase needs to be heat-treated at 55-65°C for 20-40 minutes; the oil phase needs to be melted, and the melting temperature is generally 65-85°C.

[0020] In one embodiment of the present invention, the mass ratio of the oil phase to the water phase is 6-7:3-4.

[0021] In one embodiment of the present invention, high-speed emulsification is high-speed emulsification at 8000-10000 rpm for 1-2 minutes.

[0022] The second objective of this invention is to prepare Bijels using the method described herein.

[0023] The third objective of this invention is the application of the Bijels described herein in the fields of sustained-release microcapsules, electrochemistry, food processing, functional materials, and biomedicine.

[0024] [Beneficial Effects]

[0025] (1) The bicontinuous emulsion gel prepared by the present invention can be stable at room temperature, which indicates that the Bijels obtained by pH adjustment has a certain degree of stability.

[0026] (2) The present invention does not require the combination of particulate emulsifiers with complementary functional polymers as stabilizers of the Bijels two-phase interface, nor does it require careful surface modification of particulate emulsifiers to adjust their wettability.

[0027] (3) The Bijels prepared by this invention only requires the use of amphiphilic polymer self-assembled aggregates as a stabilizer for the liquid-liquid interface, and the wettability is controlled by adjusting the pH.

[0028] (4) The regulation of the dual continuous emulsion channels prepared by the present invention can be achieved simply by adjusting the pH value of the polymer aqueous solution. The scheme is simple and easy to implement. Attached Figure Description

[0029] Figure 1 Photographs of emulsions with different pH values ​​after staining (a) and after inversion (b).

[0030] Figure 2 To capture fluorescence magnification images of emulsions at different pH levels using a 10× objective lens and to capture an overall fluorescence image of an emulsion at pH 7.3 using a 4× objective lens.

[0031] Figure 3 Two-dimensional (a) and three-dimensional (b) scanned images of the emulsion prepared at pH 7.3 (Example 1) taken at an excitation wavelength of 525 nm using laser confocal microscopy, and a three-dimensional (c) scanned image taken at an excitation wavelength of 285 nm.

[0032] Figure 4 The results of viscosity test (a) and modulus test (b) for emulsions with different pH values ​​are shown.

[0033] Figure 5 An inverted photograph (a) of the emulsion prepared at pH 7.3 (Example 1) after being stored at room temperature in the dark for 1 day and 7 days, and a fluorescence microscope image (b) of the corresponding number of days.

[0034] Figure 6 Fluorescence overall photograph (a) and fluorescence magnification photograph (b) of emulsions prepared for different pH values.

[0035] Figure 7 Polarized light microscope images of emulsions at different pH values.

[0036] Figure 8 SEM images of emulsions with different pH values ​​after freeze-drying.

[0037] Figure 9 The image shows a fluorescent overall photograph of the emulsion prepared in Example 4.

[0038] Figure 10 The images show the overall fluorescence of the emulsion prepared in Example 5; where (a) is 50 cst and (b) is 100 cst.

[0039] Figure 11 A fluorescence image of the emulsion prepared in Comparative Example 5.

[0040] Figure 12 A fluorescence image of the emulsion prepared in Comparative Example 6.

[0041] Figure 13 A fluorescence image of the emulsion prepared in Comparative Example 7. Detailed Implementation

[0042] The preferred embodiments of the present invention are described below. It should be understood that the embodiments are for better explanation of the present invention and are not intended to limit the present invention.

[0043] Test method:

[0044] 1. Emulsion dyeing:

[0045] Mix the FITC-stained polymer aqueous solution and the Nile Red-stained GTCC.

[0046] 2. External observation:

[0047] Take photos of the emulsion and observe its appearance, such as phase separation and color, to roughly determine the type of emulsion. Invert the sample vial containing the emulsion and observe whether the sample is free-flowing.

[0048] 3. Fluorescence microscopy characterization:

[0049] Take an appropriate amount of emulsion on a glass slide and observe the structure of the emulsion using a fluorescence microscope at an excitation wavelength of 485 nm. Use 4× and 10× objectives to take fluorescence microscopic images of the emulsion.

[0050] 4. Laser confocal microscopy imaging:

[0051] Take 100 μL of emulsion in a confocal culture dish with a glass slide diameter of 20 mm, and observe the emulsion under a laser confocal microscope with an objective lens of 10×, a resolution of 512×512, a scanning speed of 600 Hz, and excitation wavelengths of 525 nm and 485 nm. Take two-dimensional and three-dimensional images of the emulsion under the conditions of a resolution of 1024×1024 and a scanning speed of 200 Hz.

[0052] 3. Rheological analysis:

[0053] After the emulsion was left at room temperature for 1 day, an appropriate amount of sample was placed on the test stage of a rotational rheometer. A cone-plate mold with a diameter of 40 mm was selected, and the temperature was kept constant at 25℃. The sample was tested during the process of increasing shear rate (0.1-100 s). -1 Changes in apparent viscosity.

[0054] Furthermore, modulus tests were performed on samples with pH values ​​of 6.6 and 7.3. Specifically, a cone-plate mold with a diameter of 40 mm was used to perform frequency scanning tests on the samples at a frequency of 0.1 rad / s to 100 rad / s to obtain the corresponding storage modulus G' and loss modulus G". The two were compared to determine whether a gel structure had been formed.

[0055] 4. Stability Test:

[0056] The emulsion was placed at room temperature in the dark for 1 day and 7 days. The samples were inverted and observed to see if the emulsion had flowability to determine whether its gel properties had disappeared, thereby determining its stability. This was then verified by fluorescence microscopy.

[0057] 5. Image taken using a hot-stage polarizing microscope:

[0058] The emulsion was observed and photographed using a hot-stage polarizing microscope under 5× and 10× objectives.

[0059] 6. Scanning electron microscopy characterization:

[0060] The remaining emulsion after hot-stage polarized light microscopy was freeze-dried to obtain a powder sample. An appropriate amount of the sample was placed on a conductive adhesive, sputter-coated with gold, and then characterized by field emission scanning electron microscopy at an accelerating voltage of 3.0 kV.

[0061] Raw materials used in the examples:

[0062] Caprylic / capric triglyceride (GTCC, 98%): purchased from Shandong Yousuo Chemical Technology Co., Ltd.

[0063] Nile Red (BR): Purchased from Shanghai Titan Technology Co., Ltd.;

[0064] Fluorescein isothiocyanate (FITC, 90%): purchased from Shanghai Mairui Biochemical Technology Co., Ltd.;

[0065] Sodium hydroxide (NaOH, AR) and hydrochloric acid (HCl, AR): purchased from Sinopharm Chemical Reagent Co., Ltd.

[0066] Solid paraffin wax: purchased from Nantong Haizhixing Experimental Equipment Co., Ltd.;

[0067] P(St-co-MAA) (monomer ratio 6:4, Mn = 9655, Mw = 13942): prepared according to the reference (Zhang Y, Du H, Wang Y, et al. pH-regulated self-assembly of poly(styrene-co-methacrylic acid) for fabrication of pH-responsive Pickering emulsion[J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2025: 136231.).

[0068] Unless otherwise specified, solutions mentioned in the examples use water as the solvent, and concentration units (%) without specific meaning refer to g / 100mL.

[0069] Example 1

[0070] A one-step emulsification method for preparing Bijels stabilized by self-assembled aggregates of amphiphilic random polymers, comprising the following steps:

[0071] P(St-co-MAA) and 0.1 mol / L NaOH aqueous solution were mixed and stirred overnight to obtain a polymer aqueous solution with a concentration of 1.0% (w / v).

[0072] The pH of the P(St-co-MAA) aqueous solution was adjusted to 7.3 to obtain the aqueous phase; using caprylic / capric glycerol as the oil phase, the aqueous phase and the oil phase were mixed at a mass ratio of 4:6 and emulsified at 10000 rpm for 2 min to obtain Bijels.

[0073] Comparative Example 1

[0074] The pH of the P(St-co-MAA) aqueous solution in Example 1 was adjusted to 6.5, while other parameters remained the same as in Example 1, to obtain an emulsion.

[0075] Comparative Example 2

[0076] The pH of the P(St-co-MAA) aqueous solution in Example 1 was adjusted to 8.5, while other parameters remained the same as in Example 1, to obtain an emulsion.

[0077] The emulsions obtained in Example 1 and Comparative Examples 1 and 2 were subjected to performance tests, and the test results are as follows:

[0078] Figure 1 Photographs (a) and (b) of emulsions at different pH values ​​after staining. Figure 1It can be seen that, compared to emulsions at pH 6.5 and 7.3, the emulsion layer at pH 8.5 is located at the top, with a clear green aqueous phase precipitated at the bottom. This indicates a significant change in emulsion type with pH changes. The colors of the pH 6.5 and 7.3 emulsions are distinctly different: compared to the orange color of the pH 7.3 emulsion, the pH 6.5 emulsion exhibits a pinkish hue. Since the oil phase GTCC staining with Nile Red results in a red color, and the aqueous phase staining with FITC results in a green color, at pH 6.5, the Nile Red-stained oil phase is the continuous phase of the emulsion. The dispersed aqueous phase is coated by the oil phase in droplet form, giving the emulsion the color of the continuous phase. Therefore, the emulsion at pH 6.5 is a W / O type. The pH 7.3 emulsion is orange, possibly because under these pH conditions, the continuous phase is not a single phase but a mixture of aqueous and oil phases, which interpenetrate to form a unique bicontinuous structure. Therefore, the pH 7.3 emulsion exhibits a mixed color of red and green. The three emulsions were inverted to observe their flowability, and inverted photographs of the emulsions were obtained. Only the emulsion with pH 8.5 showed flowability, while the emulsions with pH 6.5 and 7.3 remained at the bottom of the sample vials before and after inversion, indicating that both of these emulsions contain a three-dimensional gel network structure, suggesting that the pH 7.3 emulsion exhibits bicontinuous gel properties.

[0079] Figure 2 To obtain magnified fluorescence images of emulsions at different pH values ​​using a 10× objective lens and a general fluorescence image of an emulsion at pH 7.3 using a 4× objective lens. From Figure 2 It can be seen that at pH 8.5, the continuous phase is green and the dispersed phase is red, so the resulting emulsion is of the O / W type; the emulsion at pH 6.5 is W / O; the emulsion at pH 7.3 is a bicontinuous emulsion. The spherical and anisotropic droplets of the pH 8.5 emulsion change to the interconnection between droplets, forming a continuous oil zone, while the water zone is either connected together or blocked by the continuous oil zone.

[0080] Figure 3 Two-dimensional (a) and three-dimensional (b) scanned images of the emulsion prepared at pH 7.3 (Example 1) using laser confocal microscopy, taken at an excitation wavelength of 525 nm, and a three-dimensional (c) scanned image taken at an excitation wavelength of 285 nm. Figure 3 As can be seen in (a): although there are some small black areas within the red area, most of the area consists of alternating red and black regions, representing the interpenetrating arrangement of the oil and water phases (the red area represents the oil phase, and the black area represents the water phase); from Figure 3 As can be seen in (b): the oil phase (red area) between different axial surfaces is connected, while the water phase (recessed area) is either connected or blocked by the oil phase; from Figure 3As can be seen in (c), the aqueous phase (green area) and the oil phase (gray area) are either connected together or blocked by each other. This illustrates the formation of a bicontinuous emulsion structure.

[0081] Figure 4 The results of viscosity tests (a) and modulus tests (b) for emulsions at different pH values ​​are shown. Figure 4 As can be seen in (a), with the increase of shear rate, the apparent viscosity of all three emulsions gradually decreases and then tends to level off, exhibiting obvious shear-thinning behavior. At lower shear rates, the viscosity of the three emulsions is as follows: the bicontinuous emulsion has the highest viscosity, followed by W / O, and the O / W emulsion has the lowest viscosity. Figure 4 As shown in (b), the bicontinuous emulsion at pH 7.3 exhibits a storage modulus (G') > loss modulus (G") in the modulus test, indicating that the emulsion forms an elastic gel network structure under this pH condition, resulting in bicontinuous emulsion gels (Bijels). The W / O emulsion at pH 6.6 also shows G' > G", indicating that Pickering W / O emulsions stable with self-assembled aggregates can also form a gel network structure under certain conditions.

[0082] Figure 5 An inverted photograph (a) of the emulsion prepared at pH 7.3 (Example 1) after being stored at room temperature in the dark for 1 day and 7 days, and a fluorescence microscope image (b) for the corresponding number of days. From Figure 5 It can be seen that the emulsion did not undergo significant changes in state after 1 and 7 days of storage, remaining at the bottom of the sample vial when inverted, exhibiting its original gel properties. This indicates that Bijels possesses a certain degree of stability. The emulsion's structure did not change significantly after 7 days of storage. This demonstrates that the gel properties and microstructure of Bijels do not change significantly over time, exhibiting a certain degree of stability.

[0083] Example 2

[0084] The pH of the P(St-co-MAA) aqueous solution in Example 1 was adjusted to 7.1, 7.6, and 7.9, while other parameters remained the same as in Example 1, to obtain an emulsion.

[0085] The obtained emulsion was subjected to performance testing, and the test results are as follows:

[0086] Figure 6 Overall fluorescence photograph (a) and magnified fluorescence photograph (b) of emulsions prepared for different pH values. From Figure 6It can be seen that the microstructure of the emulsion is similar to that of the pH 7.3 emulsion, both exhibiting interconnections between aqueous phases, interconnections between oil phases, and interpenetration and crossing between oil and water phases. The bicontinuous emulsion channels (continuous channels formed by the intersection of aqueous and oil phases) at different pH values ​​show significant size changes with pH changes; that is, the bicontinuous channels become more regular and compact as the pH decreases.

[0087] Example 3

[0088] A one-step emulsification method for preparing Bijels stabilized by self-assembled aggregates of amphiphilic random polymers, comprising the following steps:

[0089] P(St-co-MAA) and 0.1 mol / L NaOH aqueous solution were mixed and stirred overnight to obtain a polymer aqueous solution with a concentration of 1.0% (w / v).

[0090] The aqueous phase was obtained by treating the P(St-co-MAA) aqueous solution at 60℃ for 30 min and adjusting the pH to 7.2; the aqueous phase was obtained by using paraffin melted at 80℃ as the oil phase, mixing the aqueous phase and the oil phase at a mass ratio of 4:6, and emulsifying at 10000 rpm for 2 min.

[0091] Comparative Example 3

[0092] The pH of the P(St-co-MAA) aqueous solution in Example 3 was adjusted to 6.4, while other parameters remained the same as in Example 3, to obtain an emulsion.

[0093] Comparative Example 4

[0094] The pH of the P(St-co-MAA) aqueous solution in Example 3 was adjusted to 8.7, while other parameters remained the same as in Example 3, to obtain an emulsion.

[0095] The emulsions obtained in Example 3 and Comparative Examples 3 and 4 were subjected to performance tests, and the test results are as follows:

[0096] Figure 7 Polarized light microscope images of emulsions at different pH values. From Figure 7 It can be seen that at pH values ​​of 6.4 and 8.7, there are obvious droplets in the images; while at pH 7.2, there are only a few droplets in the images, and most of them are the intersection of dark and light areas, which is a bicontinuous emulsion; W / O and O / W emulsions are obtained at pH 6.4 and 8.7.

[0097] Figure 8 SEM images of emulsions with different pH values ​​after freeze-drying. Figure 8It can be seen that: the gray area in the SEM image is the oil area, and the black area is the water area after freeze-drying. When the pH is 8.7, the oil phase exhibits a non-spherical shape as a dispersed phase due to the characteristic of paraffin morphology changing with temperature, forming an O / W emulsion. When the pH is 7.2, the oil droplets merge to form a continuous oil phase, which together with the water phase becomes the continuous phase of the system. When the pH is 6.4, the emulsion formed is W / O, and the continuous phase of the emulsion is the oil phase. Only the continuous phase of the emulsion can be captured in the SEM.

[0098] Example 4

[0099] In Example 1, the aqueous phase and oil phase were mixed at a mass ratio of 3:7, while other steps remained the same as in Example 1, to obtain an emulsion.

[0100] The obtained emulsion was subjected to performance testing, and the test results are as follows:

[0101] The emulsion is a bicontinuous emulsion ( Figure 9 ).

[0102] Example 5

[0103] In Example 1, the oil phase was adjusted to silicone oil (50 cst, 100 cst), while other aspects remained the same as in Example 1, resulting in an emulsion.

[0104] The obtained emulsion was subjected to performance testing, and the test results are as follows:

[0105] The emulsion is a bicontinuous emulsion ( Figure 10 ).

[0106] Comparative Example 5

[0107] The oil phase in Example 1 was adjusted to be 10cst silicone oil, while other aspects remained the same as in Example 1, to obtain an emulsion.

[0108] The obtained emulsion was subjected to performance testing, and the test results are as follows:

[0109] A bicontinuous emulsion cannot be formed; the emulsion in this case is O / W (…). Figure 11 ).

[0110] Comparative Example 6

[0111] In Example 1, the aqueous phase and oil phase were mixed at a mass ratio of 2:8, while other aspects remained the same as in Example 1, to obtain an emulsion.

[0112] The obtained emulsion was subjected to performance testing, and the test results are as follows:

[0113] Unable to form bicontinuous emulsion ( Figure 12 ).

[0114] Comparative Example 7

[0115] In Example 1, the aqueous phase and oil phase were mixed at a mass ratio of 5:5, while other steps remained the same as in Example 1, to obtain an emulsion.

[0116] The obtained emulsion was subjected to performance testing, and the test results are as follows:

[0117] Unable to form a continuous emulsion ( Figure 13 ).

[0118] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A method for preparing stable Bijels from amphiphilic random polymer self-assembled aggregates via a one-step emulsification process, characterized in that, Includes the following steps: Adjusting P(St- co The pH of the aqueous solution of -MAA is 7.1-7.9, resulting in an aqueous phase; the aqueous phase and oil phase are mixed and emulsified at high speed to obtain Bijels; The mass ratio of the oil phase to the water phase is 6-7:3-4; P(St- co The concentration of the MAA aqueous solution is 0.5-1.5 g / 100 mL; The oil phase is one or more of high-viscosity silicone oil, caprylic / capric glyceride, and paraffin; the viscosity range of the high-viscosity silicone oil is 50 cst-100 cst; High-speed emulsification is high-speed emulsification at 8000-10000 rpm for 1-2 minutes.

2. The method according to claim 1, characterized in that, P(St- co -MAA) aqueous solution is used to dissolve P(St- co -MAA), the NaOH solution is an aqueous solution of NaOH with a concentration of 0.1 mol / L.

3. The method according to claim 1, characterized in that, When the oil phase is paraffin, the aqueous phase needs to be heat-treated at 55-65℃ for 20-40 minutes.

4. Bijels prepared by the method according to any one of claims 1-3.

5. The application of Bijels as described in claim 4 in the preparation of functional materials.

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