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Precursor polymer for manufacturing fine ceramic components and synthesis method thereof

A technology of fine ceramics and precursors, which is applied in the field of precursor polymers and their synthesis, can solve the problems of precursor adhesion, poor high temperature resistance, and easy deformation, etc., and achieve the goals of improved precision, improved optical activity, and improved curing speed. Effect

Inactive Publication Date: 2010-07-07
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is poor high temperature resistance, and it will easily deform due to swelling when exposed to solvents for a long time
Professor Raj of Colorado State University in the United States reported a work of making a microfluidic chip by using a precursor conversion method (Lab on a Chip, 2006, 6, 1328-1337), but the curing time of the precursor polymer used in it is long, The adhesion and swelling of the precursor itself and the mold due to adsorption will greatly affect the dimensional accuracy of the fabricated microfluidic components

Method used

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  • Precursor polymer for manufacturing fine ceramic components and synthesis method thereof
  • Precursor polymer for manufacturing fine ceramic components and synthesis method thereof
  • Precursor polymer for manufacturing fine ceramic components and synthesis method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1: 1, the reaction of 1-diacrylate methylenyl isocyanate and polysilazane

[0030] Follow the standard Schlenk technique on the vacuum line as follows:

[0031] In a typical chemical reaction, 5.0 g of silazane oligomers are dissolved in 15 ml of tetrahydrofuran solvent, stirred with a medium-speed magnetic force for 10 to 20 minutes to make them evenly mixed, and then 1 g of (1,1-diacrylic acid Methylene ester ethyl isocyanate), keep continuous magnetic stirring, react at room temperature (25°C) for about 60-80hrs, stop the reaction after the color of the reaction mixture changes from colorless to light yellow. After the reaction, the tetrahydrofuran solvent and a small amount of residual BEI in the product were removed by a high vacuum pump. The product was marked as PVSZ-BEI, and the product yield was 88.6%. from figure 1 It can be seen from the curve 2 that the peak heat flow of PVSZ-BEI is 7.9w / g, and there is no tailing phenomenon; the peak heat flow ...

Embodiment 2

[0032] Embodiment 2: the reaction of 2-isocyanate ethyl methacrylate and polysilazane

[0033] In a typical chemical reaction, 4.0g of polysilazane is dissolved in 15ml of tetrahydrofuran solvent, stirred with a medium-speed magnetic force for 10-20min to make it evenly mixed, and then slowly add 1g of IEM (methacrylic acid 2-isocyanic acid Ethyl ester), after the dropwise addition, the temperature was raised slowly, and finally the reaction was carried out at a constant temperature of 50° C. for 15-28 hours, and continuous medium-speed magnetic stirring was maintained during the reaction. After the reaction, the precipitate was removed by centrifugation and filtration to obtain a colorless and transparent low-viscosity liquid, and then the tetrahydrofuran solvent and residual IEM in the product were removed by a high vacuum pump. The product was marked as PVSZ-IEM, and the product yield was 82.8% %. The chemical reaction device is similar to that described in Example 1, requ...

Embodiment 3

[0034] Example 3: Fabrication of microfluidic ceramic components using two-photon absorption three-dimensional etching technology

[0035] Add 1.0~3.0mg of laser dye to 0.5ml of toluene, oscillate fully to dissolve it completely, then add 0.5~1.0g photocurable modified polysilazane PVSZ-BEI, oscillate fully to mix evenly, and then The solvent was removed by vacuum on the line. The criteria for a qualified sample are: the initiator is completely dissolved, the solvent toluene is completely removed, and when observed under a microscope, the sample is uniform and transparent without the appearance of granular substances. Take 1 drop of the sample and put it on a glass slide for two-photon absorption three-dimensional etching. The two-photon absorption three-dimensional etching system used in the present invention consists of three parts: laser source, optical path control, and three-dimensional etching. The laser light source is provided by a Ti: Sapphire femtosecond laser (Ti:...

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Abstract

The invention discloses a precursor polymer for manufacturing fine ceramic components and a synthesis method thereof; by utilizing pure chemical reaction between -NCO in optical activity compound and secondary amine group on a silazane precursor without by-product generation, photocrosslinking group is linked to a polysilazane molecule framework, so as to improve the optical activity of the synthesized precursor; by adopting a precursor conversion method, two-photon absorption three-dimension etching technology is applied to the programming design manufacturing of a three-dimension ceramic fine structure, such as the processing of a microfluidic chip complex ceramic component and the like; in the invention, the optical activity of the synthesized precursor is greatly improved, the photocrosslinking curing speed is improved rapidly, the curing time is rapidly reduced to within 1s from more than 100min, the precursor body and a mold can not be adhered and can not carry out swelling, so as to bring great convenience to the follow-up demoulding operation, and the precision of the manufactured microflow control component structure is greatly improved.

Description

technical field [0001] The invention relates to a precursor polymer for making fine ceramic components and a synthesis method thereof. Background technique [0002] At present, the materials used to make microfluidic chips mainly include silicon wafers, glass, polymers, etc. Polymers have become the most ideal materials for microfluidic chips because of their good biocompatibility, convenient processing and molding, low raw material prices, and good optical properties; among them, polydimethylsiloxane (PDMSO, Polydimethylsiloxane), commonly known as Silicone rubber is one of the most widely used microfluidic chip materials. Its disadvantage is poor high temperature resistance, and it will easily deform due to swelling when exposed to solvents for a long time. The rapid development of modern aerospace technology has put forward higher and newer requirements for the research of microfluidic chips. For example, various temperature / pressure sensors in the rocket engine combus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/62
Inventor 李义和李效东金东杓方庆玲
Owner NAT UNIV OF DEFENSE TECH
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