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Method for preparing cross-linked polymer film by branching molecule

A dendritic and molecular technology, applied in the field of polymer membrane preparation, to achieve the effects of easy processing into membranes, improved anti-adsorption, and improved water flux

Inactive Publication Date: 2006-08-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this patent, the idea and measures of directly using dendritic branched molecules as the main body and using small molecule cross-linking agents to prepare cross-linked polymer films have not been reported yet.

Method used

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  • Method for preparing cross-linked polymer film by branching molecule
  • Method for preparing cross-linked polymer film by branching molecule
  • Method for preparing cross-linked polymer film by branching molecule

Examples

Experimental program
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preparation example Construction

[0047] Preparation of raw materials

[0048] (1) Preparation of dendritic macromolecules with amino groups at the ends: The dendrimer with amino groups at the ends were synthesized by a stepwise method using ethylenediamine and methyl acrylate as raw materials through the alternating reaction of Micheal addition and aminolysis. 200ml of methanol and 200ml of ethylenediamine were added to a 500ml reaction vessel, stirred at room temperature and deoxygenated for half an hour, and then 125ml of methyl acrylate was added dropwise to the above mixture, and the reaction was stopped after 24 hours of reaction. The excess methyl acrylate and methanol were distilled off under reduced pressure to obtain a 0.5-generation dendrimer. Weigh 16.32g of the above-obtained half-generation dendrimer and add it to the reaction vessel, add 200ml of methanol, 550ml of ethylenediamine, and stir the reaction for 4 days under a water bath condition, most of the ethylenediamine is distilled off under r...

Embodiment 1

[0054] Example 1: Preparation of poly(amine-ester) hyperbranched polymer cross-linked films

[0055] 14.69 g of the fifth-generation hyperbranched poly(amine-ester) synthesized by the above-mentioned quasi-one-step method was mixed with 35.2 ml of an aqueous solution of glutaraldehyde with a concentration of 25 wt % to obtain a light yellow transparent solution, which was then placed in a water bath at 60°C. Heating to pre-crosslink the hyperbranched polymer, the solution changed from pale yellow to yellow after 8 hours of reaction, and the transparency decreased. Cast the pre-crosslinked casting liquid onto a clean glass or stainless steel support carrier, scrape the casting liquid into a liquid film with a uniform thickness with a scraper with a blade depth of 150 μm, and then cast the glass or stainless steel with the liquid film. The carrier was placed in a vacuum oven and kept at 130 °C for 6 h to form a primary film. Then, the carrier that formed the primary film was tr...

Embodiment 2

[0058] Example 2: Preparation of poly(amine-ester) hyperbranched polymer cross-linked films

[0059] Mix and stir 14 g of the sixth generation hyperbranched poly(amine-ester) synthesized by the above-mentioned quasi-one-step method with 16.36 ml of a glutaraldehyde solution with a concentration of 25 wt % to obtain a uniform pale yellow transparent solution, which is then placed in a water bath at 90 ° C. The hyperbranched polymer was pre-crosslinked by heating in medium, and the solution changed from pale yellow to yellow after 4 hours of reaction, and the transparency decreased. Cast the pre-crosslinked casting liquid onto a clean glass or stainless steel support carrier, scrape the casting liquid into a liquid film with a uniform thickness with a scraper with a blade depth of 150 μm, and then cast the glass or stainless steel with the liquid film. The carrier was placed in a vacuum oven and kept at 120 °C for 10 h to form a primary film. Then, the carrier on which the nasc...

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Abstract

A process for preparing the cross-linked polymer membrane from the tree-shaped branched molecular terminated by hydroxy, amino and carboxy includes such steps as dissolving the branched moleculae in solvent, adding cross-linking agent, stirring, heating while stirring for pre-cross-linking, coating it on carrier, scraping to a certain thickness, baking in vacuum oven for volatiizing solvent, baking for solidifying, and separating the membrane from its carrier.

Description

technical field [0001] The invention relates to the technical field of polymer film preparation, in particular to a method for preparing a cross-linked polymer film from dendritic branched molecules. Background technique [0002] Dendrimer chemistry is a branch of supramolecular chemistry, which is mainly divided into two categories: dendrimers and hyperbranched polymers. What both dendrimers and hyperbranched polymers have in common is a highly branched structure with a large number of reactive groups. Dendrimers have a non-regular structure, the molecular weight is monodisperse, and the functional groups are distributed on the molecular surface. This kind of molecule is completely branched and has no linear unit in the molecule. Usually they must be prepared through multi-step reactions. After each step of the reaction, they must be separated and purified. The process is very cumbersome, so the cost of synthesizing dendrimers very high. Relatively, the structural regula...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/18C08J3/24C08L77/00
Inventor 朱宝库魏秀珍徐又一
Owner ZHEJIANG UNIV
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