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Method for preparing cation polystyrene template based on porous materials

A technology of polystyrene and porous materials, which is applied in the field of preparation of quaternary ammonium salt cationic submicron polystyrene templates, which can solve the problems of easy deformation of holes in porous materials, and achieve the effect of increasing shell thickness and strengthening electrostatic attraction

Inactive Publication Date: 2011-09-14
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The task of the present invention is to find a preparation method for cationic submicron polystyrene templates with suction filterability, easy dissolubility and good monodispersity, so as to overcome the problem of pyrolysis and removal of templates in dura mater in the prior art And the problem that the cavity inside the porous material existing in the soft template is easy to deform

Method used

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  • Method for preparing cation polystyrene template based on porous materials
  • Method for preparing cation polystyrene template based on porous materials
  • Method for preparing cation polystyrene template based on porous materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Put 72g of deionized water, 8g of styrene and 0.16g of potassium persulfate into a 150ml four-necked bottle, and at a stirring speed of 350rpm, pass nitrogen gas to remove the air for about 20 minutes, then use a pre-adjusted 70 The warm water at ℃ was quickly poured into the constant temperature water bath, and kept at 70 ℃. After reacting for 1.5 hours, under the protection of nitrogen, the mixed solution of 0.4g DMC and deionized water (volume ratio of 2:1 with deionized water, the same below) was injected into the four-necked bottle with a micro-injector in batches One injection every half hour, each injection (10 μl), a total of three injections, and two more injections, one injection per hour, each injection (25 μl). Then inject another injection every 3 minutes (50 μl) until all the remaining DMC is injected. After the injection is completed, the polymerization is extended for about 12 hours to make it fully aggregated. After the polymerization is completed, the...

Embodiment 2

[0029] Since the dissolution of the template is closely related to the content of DMC inside polystyrene, this is because with the increase of DMC, the polymer molecular chains are more loosely combined, and the polymer is more soluble. Therefore, in this example, it is specially studied to increase the DMC content in the early stage of DMC (here, before 5 hours). Except that the DMC content changes, other formulas are the same as in Example 1. After 1.5 hours of reaction, under the protection of nitrogen, the mixed solution of 0.4g DMC and deionized water is injected into the reaction bottle with a micro-injector. One injection every half hour (10 μl per injection), and then two injections, one injection every hour, each injection is (50 μl). Then inject another injection every 3 minutes (50 μl) until all the remaining DMC is injected. After the injection is completed, the polymerization is extended for about 12 hours to make it fully aggregated. After the polymerization is ...

Embodiment 3

[0031] In order to increase the content of quaternary ammonium salt cations on the surface of the template, this example specifically studies how to increase the surface grafting amount of DMC. According to the formula of Example 2 before the polymerization reaction 5 hours, then inject a needle every 3 minutes, each needle is (50 μ l), and inject about 1.2 g of DMC together. After the injection is completed, the polymerization is extended for about 12 hours, so that It polymerizes well. After the polymerization is completed, the polymer is suction-filtered, washed and separated with a water-based microporous membrane (0.22 μm), and finally a monodisperse cationic submicron polystyrene template with about 15% DMC is prepared. From figure 2 It can be seen that the dispersibility of this template is very good (TEM image).

[0032] In order to explore the performance of this template that can be dissolved under milder conditions after the porous material is prepared, the catio...

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Abstract

The invention discloses a method for preparing a cation polystyrene template based on porous materials, which comprises the following steps: by utilizing soap-free emulsion polymerization, after styrene monomer polymerization is carried out for 1.5 hours, starting to inject the mixture of cation DMC and deionized water (with volume ration being 2:1) into a reaction system by a micro sample injector. The first three times of injections are respectively carried out with the interval of half an hour, and the later two times of injections are carries out with the interval of one hour. Subsequently, a plurality of times of DMC mixtures can be continuously injected every three minutes, 50 Mul of the DMC mixture is injected each time, and the highest content of the injected DMC can reach up to 30-50% (compared with the mass of St). Aqueous millipore filter membrane (0.2 mu m) is then used for centrifuging and separating the prepared cation template, and finally a cation nano polystyrene template with monodispersity is obtained. The template can be applied to the synthesis of the porous materials, is extremely easy to be dissolved in alcohol and little dichloromethane solvent, and is beneficial to removing the template of the porous materials.

Description

technical field [0001] The invention relates to the preparation of a novel monodisperse quaternary ammonium salt cationic submicron polystyrene template, in particular to the application in template synthesis of porous materials. Background technique [0002] Porous silicon is widely used in drug delivery, molecular catalysis, molecular screening, and enzyme immobilization because it can form ordered and uniform functional pore materials that match the template structure. In recent years, the research focus of porous materials has mainly focused on new synthetic strategies, and template synthesis is one of the most widely used preparation methods. At present, the method of synthesizing porous materials by template method mainly includes the following three steps: (1) according to the design requirements of porous materials, prepare removable or sacrificial template molecules by appropriate methods; (2) make template molecules and target The polymer interacts (covalently or ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F257/02C08F2/22C08J9/26
Inventor 曹顺生金鑫吴维维袁新华胡杰盛维琛
Owner JIANGSU UNIV
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